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  • Sailboat Guide

Sonar is a 22 ′ 11 ″ / 7 m monohull sailboat designed by Bruce Kirby and built by Seidelmann Yachts, Ontario Yachts, C. E. Ryder, Rondar Raceboats, DS Yachts (Schwill Yachts), and Shumway Marine starting in 1980.

Drawing of Sonar

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

  • SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

  • D: Displacement of the boat in pounds
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

Commissioned by members of Noroton YC of Darien CT USA and first built by Seidelmann Yachts. A few were also built by Carbon Index in the UK. Current builder (2019) is Rondar Raceboats.

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The Sonar is a 23.0ft fractional sloop designed by Bruce Kirby and built in fiberglass by Seidelmann Yachts since 1980.

860 units have been built..

The Sonar is a light sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat.

Sonar sailboat under sail

Sonar for sale elsewhere on the web:

sonar sailboat dimensions

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Specifications SONAR

1980 - 23.00 ft / 7.01 m - Bruce Kirby - Seidelman

SONAR

SONAR Sailboat Data

Hull Type: Fin w/spade rudder Rigging Type: Fractional Sloop LOA: 23.00 ft / 7.01 m LWL: 19.92 ft / 6.07 m S.A. (reported): 265.00 ft² / 24.62 m² Beam: 7.83 ft / 2.39 m Displacement: 2,100.00 lb / 953 kg Ballast: 930.00 lb / 422 kg Max Draft: 3.92 ft / 1.19 m Construction: FG Ballast Type: Lead First Built: 1980 # Built: 860 Builder: Seidelman Designer: Bruce Kirby

Information from  sailboatdata.com .

Hull Speed: 5.98 kn

sonar sailboat dimensions

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What kind of sailboat is a Sonar , and what are the features of this boat?

Sonars are a triple handed keelboat raced by both adaptive and able bodied sailors. The Sonar is used by sailors who enjoy a team mentality, who are often interested in racing in addition to cruising. The Sonar has a mileu of possible adaptions. Several are described below.

The video below shows both a transfer bench and an swiveling adapted Sonar seat (although the sound quality is poor),

The Sip and Puff joystick steering system is an option that helps individuals with limited mobility steer the Sonar. Find information on what a Sip and Puff system is, and where to purchase one.

Other adaptions include Stability bars and drop in seats are also used in tandem in the Sonar to help crew and skipper move from side to side as the boat sails.

Sonars also have different seating options, including:

  • Mid-Boat Seat : This seat is installed towards the center of the Sonar and is designed to accomodate individuals using Sip and Puff systems. The seat can be positioned from side to side using cleats.
  • Gimbaled Mid-Boat Seat : The gimbaled seat sits lower in the boat and swivels to keep the Skipper upright as the boat heels.
  • For general information, and to purchase a Sonar, visit Rondar Raceboats .
  • Other possible adaptions include changing the main sheet purchase and the location of the mainsheet block. Purchase adjustments are covered on page 50 of US Sailing's Adaptive Sailing Resource Manual .

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Let us know if you have questions, or if a question has gone unanswered! We will endeavor to find an answer for you and your program.

Clagett Sailing

231 Indian Avenue, Portsmouth, RI 02871 Phone: (401) 846-4470 Email:   [email protected]  

Copyright 2024, Clagett Sailing. All rights reserved | Website by Morweb.org

SONAR Detailed Review

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If you are a boat enthusiast looking to get more information on specs, built, make, etc. of different boats, then here is a complete review of SONAR. Built by Seidelmann Yachts and designed by Bruce Kirby, the boat was first built in 1980. It has a hull type of Fin w/spade rudder and LOA is 7.01. Its sail area/displacement ratio 25.92. Its auxiliary power tank, manufactured by undefined, runs on undefined.

SONAR has retained its value as a result of superior building, a solid reputation, and a devoted owner base. Read on to find out more about SONAR and decide if it is a fit for your boating needs.

Boat Information

Boat specifications, sail boat calculation, rig and sail specs, contributions, who designed the sonar.

SONAR was designed by Bruce Kirby.

Who builds SONAR?

SONAR is built by Seidelmann Yachts.

When was SONAR first built?

SONAR was first built in 1980.

How long is SONAR?

SONAR is 6.07 m in length.

What is mast height on SONAR?

SONAR has a mast height of 8.38 m.

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Sonar Tuning Guide

This comprehensive tuning guide will give you the key information needed to stay in the front of the Sonar fleet, whether you are sailing at the local or national level. Our sails are designed with proven technology in cloth as well as shape to insure durability and speed on the race course. Our sails are also designed to keep things simple in order to give you the confidence that is needed to keep your head out of the boat while sailing in close One Design competition.

TOOLS NEEDED

  • 50 Foot Tape Measure
  • Shims (At mast partners)
  • Electrical Tape
  • Screw Driver
  • Mast Blocks (six 1/2″ blocks)
  • Indelible Marker
  • Adjustable Wrench
  • Model “A” Loos gauge

Before Stepping the Mast

  • Forestay should be 25′ 11″ when measured from the bearing point of the Tee fitting aloft to the center of the turnbuckle clevis pin.
  • Clean and lubricate turnbuckles.
  • Spreader angle: set deflection at 2 3/4 — 3″.

**To get proper deflection measure from the back face of the mast to a line extending between the holes in the spreader tips. This distance should be 2 3/4 — 3″.

After Stepping the Mast

  • Adjust partner to fit snugly side to side (so mast is centered).
  • Mast step: Measure the distance from the aft face of the mast where it meets the step casting to the gel-coat edge of the center of the cabin opening lip near the floor. This should be set between 28 1/4″ and 28 3/4″. (Ontario boats only.)
  • Next, measure the distance from the forward edge of the mast partner opening to the center of the headstay anchor point. The class rule limits this dance to 7′-11.5″.

Fine Tuning the Rig

  • Center the mast laterally using a tape measure on the jib halyard to a common spot on the port and starboard rails.
  • Remove any mast blocks as well as the lower shrouds from the chainplates.
  • Remove the slack from the backstay until the headstay just becomes taut (no mast bend.) Place a mark on the deck abeam of the aft face of the mast. This is your reference point in the relaxed state.
  • Now pre-bend your mast at the deck with mast blocks on the aft side until you have moved the mast 1″ forward of the mark. Make a new mark and erase the old. This is the new “Neutral” position.
  • Next, you want to tension your upper shrouds in equal increments on both sides to between 230-260 pounds using a “LOOS-Model A” tension gauge (cable size is 5/32″ or equivalent.) Check the mast laterally again by repeating step #l.
  • Finally you want to attach the lower shrouds and adjust them so that you can make 8 to 10” circles with them at shoulder height. This requires some guess work but loose lowers are required to keep the tip of the mast in column when you are sailing. Minor adjustments should be made to you’re lowers when you first go sailing by sighting up the mast track and tightening or loosening the lowers to keep the rig straight. Now you have a great starting point and adjustments will be made from and relative to this position depending on different wind strengths and sea conditions.

Trimming Your Sails

It’s important to mark all your shrouds, sheets, tracks, outhaul, backstay, etc. Keep records of your tuning set-ups for different conditions in order to be able to reproduce settings when you know the boat was going fast.

You want to make six 1/2″ wide plastic blocks from the template shown below, this will give you the proper amount of blocks to take up the extra space and allow you to block the mast according to our chart. **Blocking measured from aft face of mast relative to the neutral position.

Blocking Positions:

Light Air/Flat Water: 1″ in front of neutral

Light Air/Lump:1/2″in front of neutral

Medium Air/Flat Water: Neutral

Medium Air / Lump: Neutral

Heavy Air/Flat Water: 1/2″ behind neutral

Heavy Air/Lump: 1″ behind neutral

Mast blocking has two profound effects. First, the more blocks you put behind the mast the less headstay tension you will have and the more the headstay will sag. This results in a deeper and more powerful jib for light and lumpy conditions.

Secondly, blocking in front of the mast will create more headstay tension thus a flatter jib for windy conditions. The second effect is relative draft position of the lower part of the main. In lighter air blocking to induce pre-bend (behind the mast), will remove forward draft and decrease the depth of the sail. In heavy conditions, you will want to block in front of the mast in order to power up the bottom part of the main in order to help you through rougher seas. Remember blocking in front also give you more tension on the headstay for a flatter jib.

Trim the mainsheet hard enough to make the top batten parallel to the boom.

You can check this by sighting from underneath the boom on a vertical plane. Once the boat has accelerated and you want to point higher, trim harder (2-3″) to cock the top batten slightly to weather. If the mainsheet is too tight (top batten hooking to weather), you will slow down. In light air and choppy water, the top batten should be parallel or twist off slightly. You may want to mark your mainsheet somewhere in the middle so you have a nice reference point for mark roundings and upwind sailing. Pull the traveler car to windward until the boom is on centerline. To check this, have your crew sight aft along the boom and line up the center of the boom with the eye that attaches the backstay to boat (this should be in the center of the transom). Keep the boom on centerline up to 12 knots and gradually drop the traveler to keep helm and heeling under control as wind speed increases. The lens foot allows the sail to act as a loose-footed sail. Upwind the lens foot should not be fully open. To set your outhaul properly, use the following guide:

**This chart is based on settings relative to the black band

**On reaches and runs the outhaul is eased 1 – 2″.

The cunningham is used to position the draft in the main. Your goal should be to keep the maximum draft position 50% back in the sail or just slightly forward of this. In a new sail, we use no cunningham up to 6 knots, enough to remove most of the wrinkles in 7 – 14 knots and progressively tighter in higher winds so there are no wrinkles. Pull the cunningham very hard above 18 knots to move the draft forward in the top of the sail. Under most circumstances, you do not need much backstay tension.

The exception would be in breezy, extremely puffy conditions, particularly when combined with flat water. In these conditions, you can use the backstay as a power control. Pulling the backstay reduces the power in the mainsail up high by opening the leech, thus reducing heel and weather helm. Remember, backstay has a large effect on luff sag. A tighter backstay equals less luff sag. More luff sag makes the jib entry fuller and moves the point of maximum draft back. This is best in light air and flat water. As the breeze freshens, a straighter jib luff produces a flatter jib entry. Use the boom vang downwind and on the reaches to control the amount of twist in the mainsail. The twist should be the least amount that still permits attached flow at the upper batten telltale and stalling is unavoidable. From 100 degrees or so to a dead run set, the vang so the top batten is parallel to the boom. Your main sail is equipped with a leech cord. The primary function of the leech cord is to prevent the leech from fluttering. In windy conditions, tension the leech cord to prevent the leech from fluttering. In light to moderate conditions, pull it just tight enough to eliminate flutter.

Your North Sonar jib does not have a wire in it. Therefore, luff sag is controlled by headstay tension (see blocking and backstay section of tuning guide). Luff sag is measured as an offset from the center of the jib luff to a straight line between the head and tack of the jib. To trim the jib correctly, you must have the lead in the proper fore and aft position. This is accomplished by moving the lead forward or backwards until all three telltales on your jib lift at the same time as you begin to pinch the boat above a close hauled course. If you find that the windward telltale on the top of the sail lifts before the ones lower down, this is an indication that the lead is so far aft and should be moved forward. Conversely, should the windward telltale on the bottom of the sail lift before those higher, then you should move the lead aft. After experimenting in say 8 to 12 knots and you have your central lead position, you may want to move the lead forward a little in very light air and aft a bit when the breeze is above 15 knots. The most critical adjustment you will make with your jib is the sheet tension. The best way to gauge this is to pull the sheet is when you are going upwind until the upper batten is parallel to the center line of the boat at the back end, or perhaps points just to leeward from parallel. In no instance do you want the upper batten pointing to windward towards the mainsail. This will create backwinding and stall the boat which will slow you down.

Spinnaker and Downwind Sailing

Set the vang so the top batten is parallel to the boom. Ease cunningham, outhaul and backstay. Trim the spinnaker so there is 6″ to 8″ of curl in the luff. Keep pole perpendicular to apparent wind. Keep outboard end of the pole even with the free clew. On runs you may want to use some leeward tweeker to keep the leeward leech from opening too much.** Remember, over trimming the spinnaker (never allowing the luff to curl) chokes down the slot between spinnaker, leech, and main. The result is a boat driven sideways instead of forward.

Steering Technique

The Sonar has a very big main, therefore, it is very important to balance the boat for different wind strengths. If your boat is not balanced, you will feel it in the helm. In heavy conditions you want to de-power the main in order to reduce windward helm. Since hiking is limited in the Sonar class, it is a good idea to sail with four people, you can use these people to your advantage by moving them around in the boat. Use crew weight to help steer the boat upwind as well as downwind. In light air, keep the crew weight low and forward in the boat as the wind freshens moves the crew weight to the windward rail and forward and close together. In all conditions playing the mainsheet, traveler and backstay will keep you in close tune with the helm. Remember, steering fast is a function of concentration and balance of your boat.

This tuning guide has provided the numbers and know-how to balance your boat. Now it is time to get out and practice and enjoy the upcoming racing season.

Your new main and jib are made from stiff resinated cloth. With just a little extra care, they will perform at top speed longer than softer materials. Both main and jib come in tube bags. They should be rolled starting at the head straight down the leech so that the battens remain parallel. The spinnaker should be flaked so that the leech tapes do not get wrinkled. The spinnaker should not be stored wet for long periods of time — some bleeding of colors may occur and this is not covered by warranty. All sails should be rinsed periodically to remove salt and should be dry when rolled up. Diligence in these areas will dramatically extend the life of your sails.

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Jib Halyard Fine-Tune

This high-power jib halyard fine-tune allows you to tension the luff as the wind cranks up. When you need headstay sag to power up the jib in chop and light air, the fine-tune allows quick control over headstay tension, making it easier to insert mast chocks.

sonar sailboat dimensions

Mainsheet Bridle

Upgrading to a bridle can make your system self-tacking in 10-20 knots and downwind while reducing the adjustments needed in other wind ranges. Simply add a second low-friction Harken 2731 car and use Spectra® strops about 28 inches long. The length of the bridle straps is key so you can sheet in hard to center the boom without closing off the leach.

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Jib Sheet Coarse/Fine-Tune

This hand-trimmed 6:1 system has a gross-trim for speed in quick tacks and a fine-tune for precise, fingertip control in any breeze.

If you would like to link to or reprint this article please contact  [email protected]

Class History

Designed in 1979 by Bruce Kirby (father of the Laser® and I-14, as well as editor of Sailing World's predecessor, Yacht Racing), the 23-foot Sonar is popular for its combination of comfort, speed, and ease of handling. This trailerable Bermuda rig, sailed by a crew of 3 to 5, seats up to 8 people and has a deep keel for stability. The Sonar's generous cockpit appealed to both disabled and able-bodied sailors. It became Europe's first Paralympic sailing class in 1996. The American Sailboat Hall of Fame inducted the Sonar in 2000 as a boat that is friendly to new sailors, exciting for club racers, and fun for day sailing.

Links Sonar Class McLube™

Boat Specifications

LOA: 23'0" (7.0 m) LWL: 19'11" (6.1 m) BEAM: 7'10" (2.4 m) DRAFT: 3'11" (1.2 m) DISP: 2100 lb (950 kg) BALLAST: 900 lb (408 kg) MAIN & JIB: 250 sq ft (23.2 sq m) SPIN: 245 sq ft (22.8 sq m)

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  • Marine Electronics

Sonar that Sees Whats Ahead

Simrads forwardscan sonar changes the way we see the bottom..

sonar sailboat dimensions

Most depthfinders are historical instruments. They collect and display information from the recent past-not the best arrangement for the sailor. By the time the sounder indicates a shoal, its already beneath you. But this is changing rapidly.

Technology that lets us see the water depth in front of us is now becoming both more user-friendly and more affordable. PS testers recently had the opportunity to test two new forward-looking sonar (FLS) technologies: the Simrad ForwardScan (discussed here) and the recently introduced Garmin Panoptix system, which uses Mill Cross arrays that can electronically steer the sonar beam to sweep the forward area and can even create 3D images.

In the field of forward-looking sonar, Simrad and Garmin are the most familiar names to sailors, but there are other contenders. One of the oldest builders of these systems, Echopilot, offers a twin-transducer, 3D, forward-looking system along with smaller, free-standing units. Farsounder, founded in 2001, also has a high-performance, forward-looking sonar suitable for larger yachts and commercial vessels.

B&G Zeus2 glass helm

Photos by Bill Bishop and courtesy of Navico

Almost all new sonar systems will let you record and save your sonar data for later playback and analysis. This includes the ability to mark a spot of interest and save the waypoint information. A sophisticated user can take advantage of this feature to create high-resolution bathymetry charts with contour line resolutions as small as one foot. Navionics has an app that does this. The app is compatible with a range of depthsounders made by Humminbird, Lowrance, B&G, Simrad, Garmin, and Raymarine. Garmin released its own multifunction display-based version called Quick Draw in January. Maxsea and other navigation programs offer similar software for PC users.

FLS technology is not new, but earlier versions such as the Interphase system  displayed bottom images that were often challenging to interpret. It took practice to discern what the myriad scattered dots on the display were truly representing-fish, rocks, something else? The Simrad system cleverly removes this ambiguity. Although users still have the option of seeing the raw data-the dots, so to speak-we can also view a computer-generated rendering of the raw data that presents an easy-to-interpret profile of the sea bottom in front of the boat.

What We Tested

The Simrad ForwardScan is compatible with Simrads NSS evo2, NSO evo2, or B&Gs Zeus Touch2 multifunction displays (MFDs) and plugs into their integrated Sonar Hub module. The transducer, which also includes a temperature sensor, operates at the 180-kilohertz frequency, which eliminates cross-talk with most other transducers. This means we can use it simultaneously with an existing depthsounder without worrying about interference. A complete Simrad system starts at about $2,000, with the following breakdown: $1,100 for display (7-inch evo2), $600 for Sonar Hub, and $800 for the transducer.

The forward-looking range is variable, but due to the physics of the technology, its at best eight times the water depth. As an example, in 20 feet of water in optimum conditions, the system can see 160 feet. In 8 feet of water, it sees forward only 64 feet-about two boat lengths, or less, depending on the boat. The maximum forward view range is around 300 feet. Simrads specifications indicate that in nominal conditions, the forward range is four to five times the depth.

The system uses a vertical array of transducer elements that looks down and forward with a port-to-starboard beam width of 15 degrees. In our 20-foot depth example, the beam width is 42 feet at the theoretical forward distance of 160 feet. At the maximum range of 300 feet, the beam width is nearly 80 feet.

Given the limited forward range of this technology, we would operate at much slower speeds when using forward sonar to find our way up a difficult channel or through coral heads into a secluded cove. This is not such a big deal for a sailboat, which already operates at relatively slow speed. To put it in perspective, at 10 knots, you will travel the maximum range of 300 feet in just 18 seconds. Eighteen seconds doesn’t give the skipper a lot of time to react, much less come to a full stop. At 3 knots, you would have a minute, enough time to stop the boat.

Simrad ForwardScan transducer

How We Tested

We evaluated a ForwardScan transducer that was mounted on a Beneteau 55 and connected to a B&G Zeus2 glass helm, 12-inch (nominal) multifunction display located at the helm. Testing took place in the Florida Keys. We used the sonar for pass approaches, near shoaled areas, and in confined channels at speeds varying from near idle to 9 knots.

Installation

The Simrad ForwardScan transducer uses a 2-inch, stainless-steel Airmar housing and is installed like most transducers. It has a fairing block that will accommodate dead-rise angles up to 20 degrees. However, a fairing block is unnecessary if the hull is relatively level in the area forward of the keel. It can also be installed on the hull sides forward of amidships, so long as the sonar has a clear view forward. Simrads software can make a transducer correction of up to +/-15 degrees out of vertical plane, easing installation requirements.

Like other Airmar transducers that use the same housing, the Simrad transducer insert has O-ring gaskets, and the housing has a valve to facilitate removing the transducer and inserting a blanking plug while in the water. The transducer has a 30-foot cable that will need to be routed to the multifunction-function display.

The MFD setup procedure requires the user to enter several values. The first pair of values are critical: forward range and minimum water depth. The second pair is the forward range and depth warning parameters. These values are dependent on your anticipated travel speeds and transducer location when using the system. It is during this phase of the setup procedure that you can adjust the vertical alignment of the transducer, if required.

Using ForwardScan

The Simrad ForwardScan system has several page configurations controlled by menu options. Users can view the bottom solely as it is interpreted by the sonar software or can display the interpreted view with the raw data (the dots) overlayed on it. The latter view is the one testers preferred.

There are a few other ways to adjust what and how data is displayed. Users can select the amount of previous sonar history that remains visible (to track bottom trends or anomalies). Users can also determine whether they want the warning zones to appear on the screen, or want to show a birds eye view of the chart, with an image of the vessel showing its position. Ahead of the boat is a colored cone indicating depths by color-green for safe, yellow for caution, and red for danger (see photos). Ideally, the boat should be upright when scanning forward, otherwise the bottom image will be skewed.

You can adjust the depth range automatically or manually. Testers found that the automatic functions worked so well, there was no need to set the depth manually. There are no classic gain-adjustments that you typically find on sonars, but there is a menu-driven interference filter to help remove screen noise if required.

Throughout the duration of our test, the system was very responsive, and the display had no problem keeping up with vessel movement. Water conditions were close to optimal for using this type of equipment. The water was both clear and relativity calm, so the system was running near or at its maximum 300-foot range. We did not get the chance to see how the system would operate in rougher conditions, but we plan to do so in further testing in the future.

No matter the conditions, users should be careful to match the boats speed to the sonars range and the water conditions. If the forward-looking sonar is to be of any use, the skipper should be capable of coming to a full stop before the end of the preset warning zone. During most of the test, we were maneuvering at around 3 or 4 knots. Testers could clearly see a shoal on the sounder, and by turning from port to starboard, the channel center through the shoal area was clearly visible. The system also picked up a large, shallow, rocky spot to the port side of the channel and accurately visualized a seawall as we turned past it into a canal.

Bottom line: PS testers liked this technology. What makes Simrads system so much more practical than previous forward-looking systems is the way the engineers were able to translate sensor data into images that sailors can actually use to avoid obstacles ahead. When used properly, it can be a powerful aid to navigation. We can see it being particularly helpful in poorly charted areas, allowing the off-the-beaten-track sailor to creep into anchorages that see very few visitors. Even in well-charted areas, the forward-looking sonar can alert the navigator of new hazards, or when he has strayed out of the center of thoroughfares like the Intracoastal Waterway. This technology certainly isn’t something that every sailor needs, but for those who are already equipped with a Simrad multifunction display and like the idea of exploring new territory, it is definitely worth considering.

Sonar that Sees Whats Ahead

When Interphase Marine launched its forward-scan technology with the SE-200, PS contributor and high-latitude voyager Andy O’Grady was one of the first onboard. O’Grady reported that the SE-200 helped him navigate some tricky channels (see PS April 2008 online), but as the screen grabs from the SE-200 above illustrate (photos 2 and 4), the images were sometimes hard to interpret. By comparison, the new Simrad ForwardScan technology (photos 1 and 3) simplifies interpretation with more user-friendly views of the bottom ahead. The raw data also can be viewed, as can processed images.

1. A split-screen view from the ForwardScan shows the bottom contours ahead (left side) and a bird’s eye view of hazards based on pre-set alarms—red for danger, yellow for caution, green for safe (right side).

2. A split-screen view of the SE-200 offers similar views, but the pixelated presentation is not as definitive or easy to interpret.

3.This split-screen view is similar to the one in Photo 1, but this time, the bird’s eye view is overlayed with a satellite image and is zoomed out.

4. A relatively flat bottom delivers a somewhat scattered return in the overhead view (right) on the SE-200.

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Are you going to review Garman’s Panoptix?

My experience with an older generation of forward scanning sonar that sequentially sweeps down to forward is that it could be of use, but only for anchoring. Otherwise, while underway it was useless, owing to the narrow window of time to react to a submerged obstacle as noted in this PS article. It is interesting however to know that the newer forward scanners do have features that some might find useful. Of particular use for avoiding submerged obstacles, if at a low enough speed, would be a menu option to select for continuous lateral sweep in full-time forward, thus w/o the down-to-forward sweeping function. Also, I am wondering if the scanners marketed as fish finders for high speed deep sea sport fishing would be of practical use for cruising sailors to identify partially submerged objects such as fish nets w/o beacon lights or partially submerged shipping containers. In this regard an audible alarm would be indispensable.

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Reference ID: a3acb7de-e6d8-11ee-906a-f97fadca92ae

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Sail area calculations

Mainsail Area = P x E / 2 Headsail Area = (Luff x LP) / 2 (LP = shortest distance between clew and Luff) Genoa Area 150% = ( 1.5 x J x I ) / 2 Genoa Area 135% = ( 1.35 x J x I ) / 2 Fore-triangle 100% = ( I x J ) / 2 Spinnaker Area = 1.8 x J x I

Copyright � 2008 Sailboat Rig Dimensions All Rights Reserved.

Where is it written that in order to point high and go fast, in order to surf and plane, in order to make the very best of light and shifty winds, you have to be bruised, battered and racked with pain? The Sonar answers the question; you can have a sparkling performance with comfort!

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This is a boat conceived by scores of sailing enthusiasts from four sailing clubs who answered a questionnaire designed to find out what they thought was important in a day racer. When compiled, their answers clearly spelled out a particular type of boat. The answers to the survey eliminated many classes as being unsuitable for a broad range of sailors, and the Sonar was created as an entirely unique boat designed around the questionnaire’s parameters.

With its spacious cockpit, sit-in safety and inherent stability the Sonar is used by many learn to sail and learn to race schools. It has become the club racer of choice for, among other organizations, the prestigious Island Sailing Club in Cowes, England, Seawanhaka Corinthian Yacht Club in Oyster Bay, NY, St.Petersburg Yacht Club in St.Petersburg, FL and The New York Yacht Club’s magnificent facility in Newport, R.I. All of these clubs use the boat for weekend racing as well a the highest level of international team racing.

The Sonar was adopted years ago by the world’s disabled sailors as their premier boat for national, world and Paralympic racing. The disabled sailors find the boat’s crew-friendly configuration allows them to sail efficiently and safely while at the same time giving them the performance and excitement enjoyed by their able-bodied friends.

Designed in 1979, the Sonar is a fantastic racing boat of the new millennium and its rapid growth and ISAF Recognized status assures its longevity and value for many years to come.

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COMMENTS

  1. SONAR

    A boat with a BN of 1.6 or greater is a boat that will be reefed often in offshore cruising. Derek Harvey, "Multihulls for Cruising and Racing", International Marine, Camden, Maine, 1991, states that a BN of 1 is generally accepted as the dividing line between so-called slow and fast multihulls.

  2. Shumway Marine

    Shumway Marine specifications and pricing for Sonar Sailboats. Located in Rochester, New York on the Genesee River near Lake Ontario. Get Directions. ... Sonar Reviews; Sonar Parts and Lines; Used Sonars; Sonar Links; Sonar Specifications. Key Specifications. Length Overall (LOA) 23' Displacement: 2,100 lbs. Waterline Length: 19'11" Ballast ...

  3. Sonar

    Sonar is a 22′ 11″ / 7 m monohull sailboat designed by Bruce Kirby and built by Rondar Raceboats, Shumway Marine, Seidelmann Yachts, Ontario Yachts, C. E. Ryder, and DS Yachts (Schwill Yachts) starting in 1980. ... Dimensions. Length Overall 22 ...

  4. Specs

    Boat; Specs; LOA: 23'0″ - 7.0m LWL: 19'11" - 6.1m BEAM: 7'10" - 2.4m DRAFT: 3'11" - 1.2m DISP: 2100lb - 950kg BALLAST: 900lb - 408kg MAIN & JIB: 250 sq.ft - 23.2 sq.m SPIN: 245 sq.ft - 22.8 sq.m. Sonar Class Association Connecticut (USA) Categories. News; Uncategorized; Recent Posts. Brian Doyle Wins Sonar 2023 ...

  5. Sonar (keelboat)

    The Sonar is a one design trailerable racing sailboat that was designed by Canadian naval architect Bruce Kirby and first built in 1980.. The design was initiated as a commission from the members of the Noroton Yacht Club of Darien, Connecticut, United States.. The Sonar was inducted into the American Sailboat Hall of Fame in 2004.. The design was developed into the more cruising-oriented ...

  6. Sonar

    The Sonar is a 23.0ft fractional sloop designed by Bruce Kirby and built in fiberglass by Seidelmann Yachts since 1980. 860 units have been built. The Sonar is a light sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat.

  7. Shumway Marine

    Shumway Marine is the exclusive US distributor of Sonar sailboats. The boat is now in international distribution. Located in Rochester, New York on the Genesee River near Lake Ontario. Get Directions. Home; Store; ... View the complete specifications. Located on Southern Lake Ontario in Rochester, New York : 585-342-3030 or 800-433-2518 : ...

  8. Specifications SONAR

    SONAR Sailboat Data Hull Type: Fin w/spade rudder Rigging Type: Fractional Sloop LOA: 23.00 ft / 7.01 m LWL: 19.92 ft / 6.07 m S.A. (reported): 265.00 ft² / 24.62 m² Beam: 7.83 ft / 2.39 m Displacement: 2,100.00 lb / 953 kg Ballast: 930.00 lb / 422 kg Max…

  9. Sonars are a keelboat for sailors

    Sonars are a triple handed keelboat raced by both adaptive and able bodied sailors. The Sonar is used by sailors who enjoy a team mentality, who are often interested in racing in addition to cruising. The Sonar has a mileu of possible adaptions. Several are described below. The video below shows both a transfer bench and an swiveling adapted ...

  10. Sonar Sail Data

    Throated Sail Cover Kit - Standard Sunbrella® Color (Booms to 13') Spinnaker Sock Kit 24' 1" to 27'. Foredeck Sail Bag Kit - Standard Sunbrella® Color (For Boats up to 30') Complete Sail Plan Data for the Sonar Sail Data. Sailrite offers free rig and sail dimensions with featured products and canvas kits that fit the boat.

  11. Sonar Class Association

    Wayzata Sailing Club hosted North American Championship. Wayzata, MN, September 18, 2023 - Wayzata Yacht Club hosted the Annual 2023 Sonar North American Championship Sailing Regatta on Sep. 14-17, on Lake Minnetonka - originally planned for 2020. There were 17 Sonar boats with approximately 68 sailors competing from as far away as New Hampshire and Vancouver, BC, in a pinnacle end-of-the ...

  12. Class Rules

    SONAR CLASS ASSOCIATION. CLASS RULES v1.13 Effective June 10, 2015. ... A.7 Sailing Instructions————-A.8 Amendments to the Class Rules A.9 Interpretation of Class Rules— ... C.6.1 DIMENSIONS The keel and rudder dimensions shall be in compliance with Section E. C.6.2 MAINTENANCE

  13. SONAR: Reviews, Specifications, Built, Engine

    1 of 2. If you are a boat enthusiast looking to get more information on specs, built, make, etc. of different boats, then here is a complete review of SONAR. Built by Seidelmann Yachts and designed by Bruce Kirby, the boat was first built in 1980. It has a hull type of Fin w/spade rudder and LOA is 7.01. Its sail area/displacement ratio 25.92.

  14. Sonar Tuning Guide

    22 January. 22 January. This comprehensive tuning guide will give you the key information needed to stay in the front of the Sonar fleet, whether you are sailing at the local or national level. Our sails are designed with proven technology in cloth as well as shape to insure durability and speed on the race course. Our sails are also designed.

  15. Sonar Deck Layout

    The Sonar's generous cockpit appealed to both disabled and able-bodied sailors. It became Europe's first Paralympic sailing class in 1996. The American Sailboat Hall of Fame inducted the Sonar in 2000 as a boat that is friendly to new sailors, exciting for club racers, and fun for day sailing. Links Sonar Class McLube™ Boat Specifications

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    Sonar Parts and Lines. Don't risk using that frayed line or bent strap any longer. We've got the parts and lines to keep your boat in tip-top shape. Please call us to place an order. The phone numbers are listed at the bottom of the page. Prices subject to change without notice.

  17. Sonar that Sees Whats Ahead

    As an example, in 20 feet of water in optimum conditions, the system can see 160 feet. In 8 feet of water, it sees forward only 64 feet-about two boat lengths, or less, depending on the boat. The maximum forward view range is around 300 feet. Simrads specifications indicate that in nominal conditions, the forward range is four to five times the ...

  18. SIMRAD ForwardScan® Thru-Hull Forward-Looking Sonar Transducer and

    Confidently navigate in shallow or poorly charted waters with ForwardScan ® Sonar.. ForwardScan ® provides forward-looking, two-dimensional sonar views of the bottom ahead of your boat. ForwardScan ® is a powerful defense against running aground, and an invaluable tool for locating secure sites to drop anchor.. The ForwardScan transducer operates at 180kHz to reduce interference from ...

  19. Sailboat Rig Dimensions Official Website

    Sailboat Rig Dimensions Database. Sailboat Rig Dimensions Database. Sail area calculations. Mainsail Area = P x E / 2 Headsail Area = (Luff x LP) / 2 (LP = shortest distance between clew and Luff) Genoa Area 150% = ( 1.5 x J x I ) / 2 Genoa Area 135% = ( 1.35 x J x I ) / 2

  20. Class

    Founded in 1980, the Sonar Class Association is the governing body for Sonar sailing worldwide. In 2000 the class obtained Recognized status with the World Sailing, the international governing body of the sport. When the Sonar was designed and orders were taken for the first fleet of boats at Noroton Yacht Club, in Darien, Connecticut, the ...

  21. Sailboat Rig Dimensions

    Sailboat Rig Dimensions. I = Height of headstay termination above the sheer line. J = Distance between the headstay termination at the deck and the front of the mast at the sheer line. P = Distance between black bands on the mast, or the maximum luff length of the main. E = Distance between black bands on the boom, or the maximum foot length of ...

  22. Boat

    The answers to the survey eliminated many classes as being unsuitable for a broad range of sailors, and the Sonar was created as an entirely unique boat designed around the questionnaire's parameters. With its spacious cockpit, sit-in safety and inherent stability the Sonar is used by many learn to sail and learn to race schools.

  23. J/24 Technical Specifications

    1 x 19 Stainless Standing rigging with open body turnbuckles. Anodized aluminum boom with Harken 5:1 internal outhaul and adjustable reef line. Complete running rigging package. (2) Two speed primary winches mounted on molded winch pads with. Winch handle and plastic holder. (2) black anodized jib tracks, with adjustment holes and two jib block ...