[beaul]

I have designed an built a 39 ft Aluminium Trimaran which we live aboard in Brisbane Australia.
It is designed to fit inside a 40 ft Shipping container so we can ship it anywhere we wish to cruise.
It has a very fine entry bow section/flat bottom and does not plane or produce a bow wave. (as per the current generation of trimaran ferries)
Currently it is powered by 2X 30 hp Honda outboards for a top speed of 10 knots but these are being replaced by 2 X90 hp outboards for a 20 knot speed.
It is also fitted with a Oceanic Lateen sail for reaching and downwind sailing.
Draft is 9 inches.
I have designed it as a live aboard for tropical areas and we have a fridge and freezer, 9,000 btu air conditioner, and desalinator.

The cost of construction was much cheaper than a 39 ft Catamaran as I am only fitting out one hull not two hulls and a bridgedeck. It only has accomodation for three (one double and a single) but we dont need the four double beds you generally have to have with a catamaran.
The outriggers fold in for use in a Monohull mooring or the Canals of Europe.

I had it built by a professional multihull ferry building company in Brisbane but I fitted it out myself.

[brian eiland]

Originally Posted by beaul

I have designed an built a 39 ft Aluminium Trimaran which we live aboard in Brisbane Australia.
It is designed to fit inside a 40 ft Shipping container so we can ship it anywhere we wish to cruise.

Interesting beaul, and welcome aboard.
Have you had it out in any big seas?
How long have you had it?

[brian eiland]

For those that might be interested in the background of Beaul's tri vessel, and some construction photos, he started THIS SUBJECT THREAD a few years ago. I referenced this discussion as I doubt we will see this material get duplicated here.

Originally Posted by Beau

An interesting aspect was seen in regard to the stern wave with the wedge type hull. (with the prototypes) at under ten knots the stern wave has quite large but as the water started to break from the stern (at about 14 knots) the stern wave flattened out completely, the boat actually seemed to raise up in the water a little, we achieved 20knots with two large people on board a 15 ft Plywood prototype with a 8 hp outboard.
No bow wave was formed, the water flow along the sides of the boat showed little or no turbulence (which is why there was no bow wave).

Yes I think we are in love with curves, everybody wants to have a nice looking boat. I am hoping that when my boat is on the water it will all come together and look pretty good.
Remember, the underwater surface of planning boats have been flat or deep veed, flat since 1948. (Raymond Hunt)

Your use of the word 'wedge' caught my attention. Have a look at another wedge shaped hull design that I discuss here:

Sea Knife

YachtForums.Com - View Single Post - Trimarans and the BladeRunner...

and look at the two other postings #46, #48