Had an interesting conversation this afternoon, with couple of boat owners here in Mission Bay. One person works in the boat yard a another claims to be into marine and navel architect designs. So here goes, this is not my statement and I have never heard this before. "That most if not all the keel - centerboards have less than a 10% increase in windward performance compared to the board being up or down, but the real benefit to lowering the centerboard is the lower the weight for ballast in carrying full sail, or for self rescue" Is any one a designer of sailboats listening, I would like to know how true that statement is. This statement does not include pure centerboard or dagger board sailboats
I would argue against that as a generality, and particularly regarding the M-15 and 17. Jerry ----- Original Message ----- From: "MC Carpenter" <southisland2@earthlink.net> To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Thursday, November 20, 2003 9:46 PM Subject: M_Boats: Potter and Catalina
Had an interesting conversation this afternoon, with couple of boat owners here in Mission Bay. One person works in the boat yard a another claims to be into marine and navel architect designs. So here goes, this is not my statement and I have never heard this before.
"That most if not all the keel - centerboards have less than a 10% increase in windward performance compared to the board being up or down, but the real benefit to lowering the centerboard is the lower the weight for ballast in carrying full sail, or for self rescue"
Is any one a designer of sailboats listening, I would like to know how true that statement is. This statement does not include pure centerboard or dagger board sailboats
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Ended this season with a stuck board on my M17 (stuck in the "up" position) . . . I'm dreading like the plague finding out what's the matter next Spring, but the problem has to wait 'till then . . . I don't think it's a swollen centerboard trunk, because the "stickiness" happened almost instantaneously . . . But we tried jumping on the cockpit floor over the c-board trunk, pounding a screwdriver into the pendant slot, no dice . . . Anyway, went on my last couple sails with the board "up", and noticed absolutely no difference in stiffness whatsoever, and we sailed in very powerful winds, but definitely noticed the leeway and poor windward progress!!! My opinion: The two Mission Bay sailors may be right about the Potter or the Catalina, but they're wrong about the Montgomery 17'. ----- Original Message ----- From: "Jerry Montgomery" <jmbn@innercite.com> To: "MC Carpenter" <southisland2@earthlink.net>; "For and about MontgomerySailboats" <montgomery_boats@mailman.xmission.com> Sent: Saturday, November 22, 2003 4:58 PM Subject: Potter and Catalina I would argue against that as a generality, and particularly regarding the M-15 and 17. Jerry ----- Original Message ----- From: "MC Carpenter" <southisland2@earthlink.net> To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Thursday, November 20, 2003 9:46 PM Subject: Potter and Catalina Had an interesting conversation this afternoon, with couple of boat owners here in Mission Bay. One person works in the boat yard a another claims to be into marine and navel architect designs. So here goes, this is not my statement and I have never heard this before. "That most if not all the keel - centerboards have less than a 10% increase in windward performance compared to the board being up or down, but the real benefit to lowering the centerboard is the lower the weight for ballast in carrying full sail, or for self rescue" Is any one a designer of sailboats listening, I would like to know how true that statement is. This statement does not include pure centerboard or dagger board sailboats
Remember, there is "initial" stability and then there is the stability at the other end of the spectrum. Beam plays an important part in the initial stability but ballast is of small consequence. Ballast is important when the boat is heeling a bunch. Tod
And would the ballast of the board, even the heavy iron board on the old M17's, make much of a difference in stability when heeled, and if so, would it make that difference when the board was up, or when it was down: It's contributing to a low center of gravity nonetheless, right? Someone theorized that it's actually safer to have the board up in wicked blow: That with the board up, unexpected gusts will cause the Monty to "skitter" sideways, rather than heel to a dangerous degree. ??? ----- Original Message ----- From: <htmills@bright.net> To: "'For and about Montgomery Sailboats'" <montgomery_boats@mailman.xmission.com> Sent: Saturday, November 22, 2003 7:44 PM Subject: Potter and Catalina Remember, there is "initial" stability and then there is the stability at the other end of the spectrum. Beam plays an important part in the initial stability but ballast is of small consequence. Ballast is important when the boat is heeling a bunch. Tod
Craig, I'd think that the cast iron board would contribute a fair amount because it's heavy and it is hanging down a ways. As to the board up/board down "skittering" theory, I really don't know the answer to that. Tod
starting a web page: http://www.bright.net/~htmills/
(don't click on the BuscaBrisas link; it doesn't work yet. It's supposed to play a .wav file of Busca's pronunciation)
That's outstanding that you're starting a web-page, Tod!!! I don't think Doug could possibly post all of the Busca (and friends) we'd like to see: I'm probably not alone saying you can't give us too much! --Craig ----- Original Message ----- From: <htmills@bright.net> To: "'For and about Montgomery Sailboats'" <montgomery_boats@mailman.xmission.com> Sent: Saturday, November 22, 2003 9:48 PM Subject: ballast Craig, I'd think that the cast iron board would contribute a fair amount because it's heavy and it is hanging down a ways. As to the board up/board down "skittering" theory, I really don't know the answer to that. Tod
starting a web page: http://www.bright.net/~htmills/
(don't click on the BuscaBrisas link; it doesn't work yet. It's supposed to play a .wav file of Busca's pronunciation)
participants (4)
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Honshells -
htmills＠bright.net -
Jerry Montgomery -
MC Carpenter