Excalibur:

Hull Speed: 6.56 knots
The Stability of the boat is: 1.95 (Stability is predicted !!)
The screening stability value of the boat is: 8.97; Angle of Vanishing
Stability is -277.88
The Displacement to Length Ratio is: 277.73. The sailboat has a moderate
displacement.
The Sail Area Displacement Ratio is: 17.31. The sailboat is a cruiser-racer.
The Motion Comfort Ratio is: 23.82

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"j" ganz @@
www.sailnow.com

"Bart" wrote in message
oups.com...
http://www.sailingusa.info/cal__hull_speed.htm

ECHO:

· Hull Speed=1.34*LWL**.5= 7.93 knots
· Capsize Screening Ratio =
Beam / ((displacement/64) ^ 1/3) = 1.69
(values less than 2 are safest offshore)
· Stability Angle=
· DL (Displacement to Length) ratio =
(Disp / 2240) / (0.01 * LWL) ** 3) = 328
cruising displacement.
· SA/D (Sail Area to Displacement) ratio =
Sail area / ((Disp / 64) ** 2/3) = 17
· Waterline length to beam =
LWL / Beam = 2.65 (a medium number; higher would be faster)
· Comfort ratio = Disp / [0.65 * (0.7 * LWL + 0.3 * LOA) * B^1.333] =
40.44
This means the boat has a very comfortable ride
· B/D (Ballast to Displacement) ratio = .52
· Beam/LWL (form stability WRT heeling resistance) = 0.38 (moderate)
· Approximate area at waterplane = LWL * Beam * 2/3 = 309 sq ft
· Approximate weight to change waterline by 1 inch =
(64 lbs / cubic foot for sal****er) * (area at waterplane)/(12 in / ft)
= 1648 lbs / in
· Weight of full water tanks = (8.34 lbs / gallon) * (110 gallons) =
917 lbs
· Weight of full diesel fuel tank =
(approx 7 lbs / gallon) * (110 gallons) =770 lbs (1050 lbs if I
increase
fuel capacity to 150 gallons)
· Weight of full tanks (water and fuel) 1687 lbs
· Change in waterline with full fuel load. ~ 1 inch