Kents private wwpotter archive : Re: P19 keel trunks

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=20
Hi Judy,=20
You said inter alia,
"I'm curious about how your keel locks down. I think that, with *any* =
keel design, it's possible to run hard aground and damage it somehow. =
Even a swing keel. It all depends on how you hit the obstruction. I've =
heard of pivot bolts getting bent on swing-keel boats in a grounding so =
it wouldn't go up or down, and/or developing leaks around the pivot bolt =
after running hard aground. So I'm curious about the design of your =
keel trunk, Mac. How does the keel lock down, and where did the damage =
occur?"=20

Both times, I was sailing with the keel full down in 5 to 6 feet of =
water in the Gulf after storms had roiled the normally clear water. =
Impact with the oyster bar was unexpected and abrupt. Kelpie stopped =
completely, pinned against the bar by wind pressure on the sails. =
Letting the sheets run free allowed her to pivot and free herself. In =
both incidents, the keel did not ride up noticeably, but rather moved =
aft in translation rather than rotation.

Neither time was the keel locked down. Since a lot of the water I =
traverse on a day sail is really thin, this is SOP for me.
No damage occurred to the forward edge of the trunk in either incident. =
All damage was concentrated at the rear of the trunk, and consisted of =
crush damage to the rounded profile of the trunk where the square =
profile of the keel impacted. Severest damage was at the exterior aft =
end of the trunk opening. Easily accessible and strongly if not =
elegantly repaired with Marine-Tex.

My keel trunk (1995 model) is free-standing, about 15 inches tall, and =
25 inches inside opening. It appears to be bonded to the hull, but not =
the liner. Where the trunk penetrates the liner, a heavy application of =
(non-structural) sealer is visible. The leading edge and sides of the =
trunk are slightly over a half inch thick, increasing to maybe three =
quarter inch on the aft end.
Looking down from above you can see that the trunk lay-up is solid, is =
made of multiple layers of cloth and mat.
Hope this is what you're looking for,
Mac Davis
Kelpie, WWP19 #804, Aripeka, FL

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"I'm curious about how your keel locks = down. =20 I think that, with *any* keel design, it's possible to run hard = aground=20 and damage it somehow. Even a swing keel. It all depends on = how you=20 hit the obstruction. I've heard of pivot bolts getting bent on = swing-keel=20 boats in a grounding so it wouldn't go up or down, and/or developing = leaks=20 around the pivot bolt after running hard aground. So I'm curious about = the=20 design of your keel trunk, Mac. How does the keel lock down, and = where did=20 the damage occur?"

Both times, I was sailing with the keel = full down=20 in 5 to 6 feet of water in the Gulf after storms had roiled the normally = clear=20 water. Impact with the oyster bar was unexpected and abrupt. = Kelpie=20 stopped completely, pinned against the bar by wind pressure on the = sails. =20 Letting the sheets run free allowed her to pivot and free herself. = In both=20 incidents, the keel did not ride up noticeably, but rather moved aft in=20 translation rather than rotation.

Neither time was the keel locked = down. Since=20 a lot of the water I traverse on a day sail is really thin, this is SOP = for=20 me.

No damage occurred to the forward edge = of the trunk=20 in either incident. All damage was concentrated at the rear of the = trunk,=20 and consisted of crush damage to the rounded profile of the trunk where = the=20 square profile of the keel impacted. Severest damage was at the = exterior=20 aft end of the trunk opening. Easily accessible and strongly if not = elegantly=20 repaired with Marine-Tex.

My keel trunk (1995 model) is = free-standing, about=20 15 inches tall, and 25 inches inside opening. It appears to be = bonded to=20 the hull, but not the liner. Where the trunk penetrates the liner, = a heavy=20 application of (non-structural) sealer is visible. The leading = edge and=20 sides of the trunk are slightly over a half inch thick, increasing to = maybe=20 three quarter inch on the aft end.

Looking down from above you can see = that the trunk=20 lay-up is solid, is made of multiple layers of cloth and = mat.

Re: P19 keel trunks - one more time [long]