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- Sailboat Guide
X Boat (Usa)
X Boat (Usa) is a 16 ′ 0 ″ / 4.9 m monohull sailboat designed by John O. Johnson and built by Johnson Boat Works and Melges Performance Sailboats starting in 1932.
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)
John O. Johnson was the founder of Johnson Boat works (1897) and was an early innovator in scow design on the Great Lakes. Also called the CUB. Most often sailed/raced by younger sailors (under 16). Main and jib only.
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Category archives: m-16.
Everything you ever wanted to know about the M16 Scow.
Protected: A tutorial on tacking
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A bit of history …from the fella who built the boat
Using the lift.
This quick tutorial is so you know the steps to get the M16 into the water. Continue reading Using the Lift →
First Splash-2011
Our friends Ed and Georgette met us at the Washington Sailing Marina bright and early to learn the ropes on the M16 and try their hand at tacking and gybing.
Even at 9am when we wheeled the boat to the lift, it was feeling balmy with temps on their way to a high of 58F. March 5 is still winter, but you would never know it. A soft 4-8 knot southerly rippled the water with promise. Continue reading First Splash-2011 →
M16 Sail Setup
This tutorial shows how to raise the sails on the M16. Continue reading M16 Sail Setup →
Racing Scows on the Potomac River
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