Typhoon Twin Compression Arms

[Mike]

Les, thank you for the below posting! Most interesting about Cape Dory's recommended fix to Typhoon deck-sagging around the mast tabernacle.

Does anyone have postable photos of a Ty with twin compression arms, or details about the twin compression arms? If the molds are no longer available, with some 2,200 Ty's that are either sagging, or will be sagging, maybe someone like Mystic Marine could mill-up some wooden twin compression arms.

Regards,

Mike


Re: Typhoon Compression Arms

Posted by: les bloom (jlbloom@earthlink.net) on 7/16/02 at 19:08
In Reply to: Re: Typhoon Compression Post posted by Mike on 7/14/02 at 16:22

MIKE : I believe what your are referring to are " twin compression arms". I justs talk to a former Cape Dory employee who flew all over the country back in the 80's,when the problem first started to show up to installing the after-market compression arms. None were factory installed. The compression arms were constucted from a single molded piece of fiberglass conforming to the shape of the cabin. There were two seperate molds one port /one starboard. There was a flange on both side of each arms,this made for a very nice installation. The molds were owned Cape Dory and used by them exclusivily for the typhoon. Who has them now, I don't know; Spartan/ Robin Hood Yachts/ that new outfit that now owns the hull mold ?????? They may have been destroyed,I hope not!! If they could be located or a set salvaged from a boat that has seen its last days on the water, maybe someone like Mystic marine might tool up for them. I plan to keep looking in to this even though I don"t need any & will report back.


HEY, THIS IS A GREAT PROJECT FOR TYPHOON SAILORS!! ANYONE ELSE HAVE HAVE ANOTHER PIECE OF THIS GREAT MYSTERY. COME ON BACK ANYONE.


Les Bloom
S/V PYEWACKET
1974 TY #567
Sailing on the SAKONNET

I think Greg Jones in his article on Retrofitting a Typhoon (Tradition and Stability in a Small Package), pages 78-79, and 86, in the March 2001 issue of Sailing Magazine, stated the factory recommended compression post retrofit for a TY was "twin posts". The Ty he had bought for the article had twin compression posts installed by some previous owner. But I have never seen a twin post Ty retrofit. Has anyone else?

I just recently purchased a Typhoon (1977 Hull # 1314). This year did not have a compression post and I would like to install one. I would like to get the specs for the post (particularly the length). Any help appreciated.

guthriemn@aol.com

[Bob Bernier]

Mike;
My Typhoon has two "compression arms" also. In a wooden boat, they would be called "hanging knees" or just plain "knees". These were use anywhere on the boat framing where additional strenght was needed; mast partner, cockpit opening, etc.
The solution to the cabin top flexing problem (due to mast forces) can be solved in one of two ways that i'm sure you have read about on this board, i.e. a compression post or the "compression arms", as you call them.
If the idea of a compression post in your cabin runs against your sense of aestethics then you could fabricate a pair of "knees" to help support the cabin top, either from wood or glass.
There are many good books that portray these schemes and how to instructions as well. "From A Bare Hull" by Ferenc Mate is a very good source.
A wooden pair of knees as well as a under-mast deck beam could be laminated from oak strips and varnished - this would really be "yachty"! (I like to putter, so this suggestion is easy for me to make. But if you are averse to doing the work yourself or have not the experience; this would be a great project to gain skills in working with glass and wood.)
Please do not hesitate to e-mail me if you would like any further help.
Sincerely,
Bob Bernier
Typhoon "Belle Therese"
Nasketucket Bay
Fairhaven, MA



rbernier@alsic.com