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

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

"Krusty Morgan" stupidly wrote ..

Your boat, hit by a 4 foot breaking wave will do fine. Hit
it with a 20 foot breaking wave, and the outcome will be
quite
different.


BRILLIANT ! What insight !!!

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

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

"Krusty Morgan" stupidly wrote ..


That sounds a lot closer to your actual boat, although I
think including the
word "racer" is solely for marketing purposes. G In my
eye, it is a medium
weight cruiser - and a good one. Calling it a racer would
be like describing
Oprah as having an "athletic build". LOL Your boat was
built for comfort, not
speed. It seems to suit your needs quite well.

BB , X X X O O O X X X



Ain't love grand?

--
"Krusty Morgan" stupidly wrote ..


"Krusty Morgan" stupidly wrote ..

Your boat, hit by a 4 foot breaking wave will do fine.
Hit
it with a 20 foot breaking wave, and the outcome will
be
quite
different.


BRILLIANT ! What insight !!!


Too bad you lack same.


Too bad indeed. Now, professor, could you tell us if
falling from a soapbox versus falling from a 10 story window
will also produce a quite different outcome?

mmmm?


SBV

"Krusty Morgan" stupidly wrote ..
That sounds a lot closer to your actual boat, although I
think including the
word "racer" is solely for marketing purposes. G

The term "racer-cruiser" seems a bit more popular than
"cruiser-racer" but would seem appropriate to very wide
number of boats. (more below)


... In my eye, it is a medium
weight cruiser - and a good one. Calling it a racer would
be like describing
Oprah as having an "athletic build". LOL Your boat was
built for comfort, not
speed. It seems to suit your needs quite well.

BB , X X X O O O X X X




Scotty wrote:
Ain't love grand?


What's more, Charl(krust)ie doesn't seem to recognize the
CS-27 origin, even given the strong hint of it's years when
actively produced & marketed. The hull & rig are fairly
typical of early/mid 1970s IOR boats, where the measurement
rule had encouraged beamy boats with narrow aft sections and
masthead rigs with short booms. Being a production boat, the
CS-27 is a moderate design rather than an extreme IOR late
'70s broach-coach, but if you parked next to one, you'd see
the family resemblance.

DSK