YAMAHA 21 Specifications
Hull Type: Fin w/transom hung rudder Rigging Type: Fractional Sloop LOA: 21.10 ft / 6.43 m LWL: 17.39 ft / 5.30 m S.A. (reported): 221.63 ft² / 20.59 m² Beam: 8.14 ft / 2.48 m Displacement: 2,359.00 lb / 1,070 kg Ballast: 728.00 lb / 330 kg Max Draft: 4.27 ft / 1.30 m Construction: FG First Built: 1979 Builder: Yamaha (JAP) Designer: Yamaha Design Group
Hull Speed: 5.59 kn
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Review of Yamaha 21 JOG III
Basic specs..
The boat is equipped with 4 berths.
The Yamaha 21 JOG III has been built with different keel alternatives.
One option is a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.
The boat can enter even shallow marinas as the draft is just about 1.20 - 1.30 meter (3.94 - 4.24 ft) dependent on the load. See immersion rate below.
Another option is a fin keel.
Yamaha 21 JOG III can enter even shallow marinas as the draft is just about 1.20 - 1.30 meter (3.94 - 4.24 ft) dependent on the load. See immersion rate below.
The boat can enter even shallow marinas as the draft is just about 1.40 - 1.50 meter (4.59 - 4.89 ft) dependent on the load. See immersion rate below.
An outboard motor is often used on this boat. In that case the boat will typically require a power of 2 - 3 hp, alternatively 48 - 58 lbs thrust if you prefer an electrical motor. Electric outboards are becoming popular for sailboat owners who want clean instant power with less noise and no exhaust fumes.
Sailing characteristics
This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Yamaha 21 JOG III is 2.25, indicating that this boat would not be accepted to participate in ocean races.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 5.7 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.
The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Yamaha 21 JOG III is about 85 kg/cm, alternatively 478 lbs/inch. Meaning: if you load 85 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 478 lbs cargo on the boat it will sink 1 inch.
Sailing statistics
This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.
What is Motion Comfort Ratio (MCR)?
What is L/B (Length Beam Ratio)?
What is a Ballast Ratio?
What is Displacement Length Ratio?
SA/D (Sail Area Displacement ratio) Indicates how fast the boat is in light wind: - Cruising Boats have ratios 10-15 - Cruiser-Racers have ratios 16-20 - Racers have ratios above 20 - High-Performance Racers have ratios above 24 Sail-area/displacement ratio (SA/D ratio): 15.74
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 15m 2 (161 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.
If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.
| Usage | Length | Diameter | ||
| Jib sheet | 6.4 m | (21.0 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 6.4 m | (21.0 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 16.0 m | (52.5 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 14.1 m | (46.2 feet) | 10 mm | (3/8 inch) |
This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.
Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.
We are always looking for new photos. If you can contribute with photos for Yamaha 21 JOG III it would be a great help.
If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.
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Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The boat is better suited for ocean passages (vs coastal cruising) if the result of the calculation is 2.0 or less. The lower the better.
Yamaha has revealed an all-new 21-foot sportboat platform that will support five distinct models, each faster, quieter, and loaded with more features than the best-selling boats they replace.
YAMAHA 21 Specifications. Hull Type: Fin w/transom hung rudder Rigging Type: Fractional Sloop LOA: 21.10 ft / 6.43 m LWL: 17.39 ft / 5.30 m S.A. (reported): 221.63 ft² / 20.59 m² Beam: 8.14 ft / 2.48 m Displacement: 2,359.00 lb / 1,070 kg Ballast: 728.00 lb / 330 kg Max Draft: 4.27 ft / 1.30 m Construction: FG First Built: 1979 Builder ...
Specifications and Review of Yamaha 21 JOG III based on the boat's specifications and artificial intelligense.
Yamaha. This division of the Japanese motor company built and exported sailboats to the US for a few years (beginning in the late 1970's). Later it was called the New Japan Yacht Company. Years in Business: 0 - present. Sailboats Built By Yamaha.
Yamaha sailboats for sale by owner. Your search returned 6 matches of 106188 sailboats posted to date. Sort by: Length Year Price Added.