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

Bart wrote:

http://www.sailingusa.info/cal__hull_speed.htm


The Stability of the boat is: 2.99 (May be vulnerable to capsizing !!)

OMFG!!!
My centerboard dinghy may be vunerably to capsize!!!
Oh Noes!!!!
Everybody Panic!!!

//Walt

http://www.sailingusa.info/cal__hull_speed.htm


Cool link.


Walt wrote:
The Stability of the boat is: 2.99 (May be vulnerable to capsizing !!)

OMFG!!!
My centerboard dinghy may be vunerably to capsize!!!
Oh Noes!!!!
Everybody Panic!!!


When in danger, or in doubt
Run in circles, scream and shout

DSK

DSK wrote:

When in danger, or in doubt
Run in circles, scream and shout

RAH

DSK wrote:

When in danger, or in doubt
Run in circles, scream and shout

Great minds think alike.

http://makeashorterlink.com/?B4A653C0E

//Walt

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

--
"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

I'm not sure what these numbers mean. It seems to be the angles
should be less than 180--that's inverted!

Capt. JG wrote:
Excalibur:
The screening stability value of the boat is: 8.97; Angle of Vanishing
Stability is -277.88

I'm not sure either... might be that it won't come back?

--
"j" ganz @@
www.sailnow.com

"Bart" wrote in message
oups.com...
I'm not sure what these numbers mean. It seems to be the angles
should be less than 180--that's inverted!

Capt. JG wrote:
Excalibur:
The screening stability value of the boat is: 8.97; Angle of Vanishing
Stability is -277.88