42ft trimaran stern

[nicktroy]

Two years ago I got given an 80s 42ft racing trimaran with a big powerful rig. What I think has happened to it is that the rudder was smashed off and the main hull shortened to the point where the rudder was. There is now a dinghy style rudder attached to the new transom. The problem with the boat is that it doesn't go nearly as fast as it should - max 14 knots which is not fast for a tri of this size given that the main hull is only 4'6 wide and the beam is 32 ft. I think the problem is that the bottom of the new transom is 8 inches below the water line. My understanding is that the turbulance caused by this slows the boat a lot. Is this true? Would it be worth rebuilding the stern? Also, if I am to rebuild the stern what is the best rudder system to allow it to survive impact and to be withdrawn in shallow water?

[Bruce Woods]

What design is it?. Can you post a picture?

[TeddyDiver]

Originally Posted by nicktroy

My understanding is that the turbulance caused by this slows the boat a lot. Is this true? Would it be worth rebuilding the stern? Also, if I am to rebuild the stern what is the best rudder system to allow it to survive impact and to be withdrawn in shallow water?

Yes, Yes, and make search here of rudders, lot of good stuff & links.

[nicktroy]

Originally Posted by Bruce Woods

What design is it?. Can you post a picture?

I would love to include a picture but how do I do that?

[nicktroy]

When you say a lot do you mean it should do an extra 5 knots - to 15 knots in 20 knots of wind on the beam?

[multihullsailor]

Originally Posted by nicktroy

I would love to include a picture but how do I do that?

Press "Reply" or "Quote", then go to the "Additional Options" section underneath the comment area, press "Manage Attachment" and upload a picture from your computer. Don' forget to "Submit Reply" - looking forward to seeing your tri. Where do you keep her?

Roger

[Fanie]

I agree with Teddy - my little tri has that drag when I have too much weight aft. Move it foreward so the stern lifts to above the waterline and it's a new boat