Here's the explaination for everything; http://www.tedbrewer.com/yachtdesign.html

Built 1984, shoal draft

LOA 37'

LWL 30'

Beam 11' 10 in

Draft 4' 10"

Draft of hull only, approx. 2'

Displacement 22,000 lbs (not the 18,000 advertised)

Ballast 7700 lbs

Sail Area 710 sq ft

Mast Height from water 51'

Water Capacity 100 gal

Fuel Capacity 44 gal

Aux. Power 38 hp

I 46'6 in

J 17'

P 39' 8 in

E 13'

Disp. Length Ratio T

Keel Material Lead

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Hull Speed 7.34

The following is the formula used to calculate The Theoretical Maximum Hull Speed:

Maximum Hull Speed = 1.34 * LWL1/2

LWL: Boat Length at Water Line

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

CAPSIZE SCREENING FORMULA (CSF): Some years ago the technical committe of the Cruising Club of America came up with a simple formula to determine if a boat had blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The formula is the maximum beam divided by the cube root of the displacement in cubic feet; B/Displ.333. The displacement in cubic feet can be found by dividing the displacement in pounds by 64, of course.

The boat is acceptable if the result of the calculation is 2.0 or less but, of course, the lower the better. For example, a 12 meter yacht of 60,000 lbs displacement and 12 foot beam will have a CSF Number of 1.23, so would be considered very safe from capsize. A contemporary light displacement yacht, such as a Beneteau 311 (7716 lbs, 10'7" beam) has a CSF number of 2.14. Based on the formula, while a fine coastal cruiser, such a yacht may not be the best choice for ocean passages.

Capsize Ratio for Hunter 37 cutter is 1.91

The Stability of the boat is: 1.71 (Stability is predicted !!)

The following is the formula used to calculate The Capsize Screening Formula:

Capsize Screening Formula = Beam / (Displacement / 64)1/3

Displacement is in Pounds

Beam is Measured in Feet

The screening stability value of the boat is: 29.36; Angle of Vanishing Stability is 130.66

The following is the formula used to calculate The Angle of Vanishing Stability:

Screening Stability Value ( SSV ) = ( Beam 2 ) / ( BR * HD * DV 1/3 )

BR: Ballast Ratio ( Keel Weight / Total Weight )

HD: Hull Draft in meters

DV: The Displacement Volume in cubic meters. DV is entered as pounds of displacement on the webpage and converted to cubic meters by the formula:

Displacement Volume in Cubic Meters =

( Weight in Pounds / 64 ) * 0.0283168

The Beam and Hull Draft in this formula are in meters. These values are entered in feet on the webpage and are converted to meters before SSV calculation.

Angle of Vanishing Stability approximately equals 110 + ( 400 / (SSV-10) )

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

The Sail Area Displacement Ratio is: 14.47. The sailboat is a cruiser-racer

The following is the formula used to calculate The SA/D Ratio:

SA / D = Sail Area / ( DV ) 2/3

SA: Sail Area in Square Feet

D: Displacement in Cubic Feet

DV: The Displacement Volume in cubic feet. DV is entered as cubic feet of displacement, tons or pounds of displacement on the webpage. If entered as pounds of displacement, this value is converted to cubic feet by the formula:

Displacement Volume in Cubic Feet = Weight in Pounds / 64

Displacement Volume in Cubic Feet = ( Long Tons of Displacement * 2240 ) / 64

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

The Displacement to Length Ratio is: 363.76. The sailboat is a heavy displacement cruiser.

DISPLACEMENT/LENGTH RATIO: The D/L ratio is a non-dimensional figure derived from the displacement in tons (of 2240 lbs) divided by .01 LWL cubed, or, Dt/(.01 LWL)3. It allows us to compare the displacement of boats of widely different LWLs. Some examples of various D/L ratios follow, but are generalities only as there is often a wide range within each type.

BOAT TYPE D/L RATIO

Light racing multihull 40-50

Ultra light ocean racer 60-100

Very light ocean racer 100-150

Light cruiser/racer 150-200

Light cruising auxiliary 200-250

Average cruising auxiliary 250-300

Heavy cruising auxiliary 300-350

Very heavy cruising auxiliary 350-400

The following is the formula used to calculate The D/L Ratio:

D / L = Displacement / ( 0.01 * LWL )3

LWL: Boat Length at Water Line

D: Displacement in Log Tons

Displacement can be entered as long tons or pounds of displacement on the webpage. If entered as pounds of displacement, this value is converted to long tons by the formula:

Long Tons = Pounds / 2240

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

The Motion Comfort Ratio is: 38.41

The CR is : Displacement in pounds/ (.65 x (.7 LWL + .3 LOA) x B1.333). Ratios will vary from 5.0 for a light daysailer to the high 60s for a super heavy vessel, such as a Colin Archer ketch. Moderate and successful ocean cruisers, such as the Valiant 40 and Whitby 42, will fall into the low-middle 30s range

Motion Comfort Ratio was developed by Boat Designer Ted Brewer. The formula predicts the speed of the upward and downward motion of the boat as it encounters waves and swells. The faster the motion the more uncomfortable the passengers. Thus, the formula predicts the overall comfort of a boat when it is underway. Higher values denote a more comfortable ride. As the Displacement increases the motion comfort ratio will increase. As the length and beam increases the motion comfort ratio will decrease.

The following is the formula used to calculate The Motion Comfort Ratio:

MCR = Disp / (2/3*((7/10 * LWL)+(1/3 *LOA))*Beam4/3)

Disp: Displacement in pounds

LWL: Boat Length at Water Line in feet.

LOA: Over All Length of the Boat in feet.

Beam: The Widest Part of the Boat in feet.

Displacement can be entered as long tons or pounds of displacement on the web page. If entered as pounds of displacement, this value is converted to long tons by the formula:

Long Tons = Pounds / 2240