A nice pic of Pat LeMehaute’s KHSD 37 tri.
It was featured on the weather channel a few years back. Foam/glass.
Category Archives: Trimarans
New Rowing Trimaran
You might recall that my Formula 40 catamaran hull lines held the world record for fastest rowing across the Atlantic last year. For a day. I did not know about the rest of the design, and a lot was wrong. I insisted on being fully involved with the next boat. Crew of 9. Here it is.
Rower 60 Trimaran
Features:
Main hull has L/B of 21:1. Displacement of 4848 lbs. Hull speed is 11 knots. At hull speed it takes under 6 hp to move at that speed. At that speed there is 265 lbs of form drag and 125 lbs of friction drag. Draft is only 12” so change in depth over the trip should not change much, keeping waterline long.
X bow allows less hull area, reduced windage and significantly less wave pitching. See video at http://www.militaryphotos.net/forums/showthread.php?152989-Xbow-Sea-Axe-A-future-in-the-Military-Design.
Next year everybody will have these bows. Flare is high enough above waterline that it should not increase pitching.
Total main hull max height is 6.5’. I say that the governing load will be a wave on each end and the middle in the air. The flare also helps restrain buckling.
Curved openings are much stronger. Upwind I would cover openings with Eisenglass or thin acrylic like man-powered craft record holders do.
Top will have solar panels and flush hatches as needed.
Amas are just under 17’ long and 1000 lbs displacement reserve. I see greatest load being pushed sideways 20’ by a wave. Location aft helps minimize pitching again as it spreads out the centers of buoyancy.
I assume beam should be completely rigid, like in bicycle racing where flexing frame is seen to absorb power.
I see this as having every possible thing done right. I don’t know if 5’ tall above waterline is too much. It does give more beam depth.
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New 75′ Trimaran Design
I have had my head down again for the last couple of weeks getting the new Kai Oli Oli bid set done rush. I did manage to start on the new 75′ trimaran for Mark in Belgium. Foam/glass and foam/carbon.
Power Tri Design for Goa
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height=”214″ class=”alignnone size-medium wp-image-1040″ /> Did this 32 power charter tri for Goa. Trying the tropical corrugated metal look, but in composite. Seats 16.
New Pictures 37 Tri
I got some beautiful pictures of Stefan’s KHSD 37 tri Yantri. See http://www.owi.bz/collection/?uid=2d7e2b81-d66d-4376-883b-4aa98cb02673
It might be for sale soon.
Wow
Simmo blows my mind with this great picture. He is sailing his KHSD24 trimaran. The latest in a whole line of amazing stills and videos.
see also www.silentbay.it
75′ Trimaran
Am just starting a custom 75′ trimaran spaceship based on the earlier 72′. How cool is that?
New 63 Tri on Maui
Ama molds of Jeri Stevens new KHSD 63 tri on Maui.
63/65 Trimaran
I had a visit today from the builder of the stretched 63 trimaran in Marysville. It will have two unstayed rotating carbon masts. He is a prodigious worker. This picture is from a couple of years ago.
Trimaran Hull Alignment
On a catamaran, you simply measure centerline to centerline front and back, and you’re there.
On a trimaran, if the amas have no angle, or if the sheer line is parallel to the water, the same.
But who wants amas with no angle and no shape on the sheer? On these, if you match centerline forward with centerline aft, your hulls will not be parallel. This slightly ancient graphic shows why. The CM Construction Manual has this and the new Composites Manual underway now will have a newer graphic of the same thing.
