Just Trimarans

[beau]

Beau's Boat,
I have a similiar folding system to a dragonfly.
I can adjust the width of thr boat from 22ft wide to 12ft wide. (Mono marina berth)
The boat is essentially designed as a fast motor sailer.
The sail rig (oceanic lateen) is low cost and designed for down wind sailing. It is not set up to tack. We sail with the outriigers at 22 ft.

However we are finding that as we get older we tend to motor more often.
I have now decided to replace the 2x30 ft Honda's with 2x90 hp Tohatsu's so i can throttle back for fuel economy, and yet still get the 20 knots when I need it.

I do not see any stability problems with the current setup.
However I am an experienced multihull sailor and there is a difference.

[SailFastTri]

OK with 2x90hp you got me curious so I searched and found pictures here: http://www.cruisersforum.com/forums/...boat-9093.html

How are you controlling crossbeam movement and keeping it all rigid?

[beau]

The beams are heavily enginered plus I added two chains on a triangular angle from low down on the hull similiar to the dragonfly

[beau]

This particular design was not set up for diesels because of weight and cost,the ability to beach and lift the outboards clear plus the boat was designed to fit into a 40ft container.

I have designed a larger version 45ft X 22ft designed for motoring only which can be fitted with two Steyr 165 diesels or two 150hp outboards.Because of the wedge type hull, maximum buoyancy is in the stern
45ftX 22ft (Catamaran berth)
Bridgedeck above water 2ft 6inches (800mm)
Draft of 600mm or 2ft
Weight 10 tonne
Motors 2 X 150 hp four stroke outboards
OR two Steyr 165 hp diesels
Cruising speed of 15 knots maximum of 20 knots
6mm aluminium underwater, 4mm elsewhere

Large open plan, above water living area
Two full headroom double (4ft 6inches wide) bedrooms
Upstairs galley Fridge/ freezer
Gas oven and 4 burners
Microwave Pantry
Large shower Separate toilet
Full width aft deck