Catamaran Hull Boat How does a catamaran's hull help a boat plane?(plz help)?
I have to do this D&T Homework, so can anyone help(and include sources)
Almost a trick question. It comes down to displacement and drag. It goes well beyond hull design. Weight distribution can be a major contributor to any hull design. Tri hull is better than catamaran. You have to break the design down to sail vs power. I started designing boats at 8 years old, now a senior citizen. If making your boat plane is your objective, I can design a power or sail boat to plane with a FLAT bottom much faster than any other construction. The speed will be slow, and the vessel will be light, but flat bottom will win everytime, but not real practical for comfort, speed or handling. At 8 years old, I built a boat that went on plane with a 15 hp neptune motor. It only went about 5mph, but it was totally on plane. Ended up designing my own boats, became national champion, national highpoint champion, regional champion, national short course champion, national marathon champion. (not bragging, just blessed). [I designed my own boats]
Lone catamaran yacht and seagulls, South Hams, Devon, UK. Copyrighted Work Lone catamaran yacht and seagulls, South Hams, Devon, UK Silverport Pictures
The 28 inch Offshore Racing Boat is one fast boat with its dual twin motors. The Off Shore RC Boat is powered by PC Twin propellers. Power comes from a included standard Sub C Nicad Pack as used in Tamiya cars which will give around 20 minutes of runtime after fully charged...
Long typecast as the hotrods of the sea--fast but dangerous--modern cruising multihulls actually are among the safest and most comfortable cruising sailboats available. Modern multihulls offer significant advantages over single-hull sailboats: They sail faster, have more living space, they're more comfortable, more stable, they can sail safely in much shallower water, and, because their stability comes from widely spaced hulls and not from tons of lead hung off the keel, they don't sink...
I am constructing a commuter boat with a displacement hull, and just thought of this simple way of increasing hull speed without actually increasing the hull:
What if I simply attached an unbelievably long fin (the length of the boat itself) with its own, tube-shaped flotation tank, to the rear of my boat? You know, like a sea snake's tail?
It could be hinged so that it can be pulled up for mooring, and would then look like a mast with a wall.
It's going to be an 18-foot catamaran with four seats and a 8HP diesel motor. I 'd love to get at least ten knots out of it without exceeding hull speed, hence the idea of artificially extending the hull with a tail.
But would that work?
always interesting to see the progress of your project!
as to a hinge up tail.....no is the short answer......and as was mentioned you'll have something so weird there will be little market value....
if you are going top operate this as a passenger boat, you will need Australian MCA or whatever the US Coast Guard inspection equivalent is there and something so radical as a tail that might break off in bad conditions, or even while docking would never pass here and I would doubt there.
If you type "wave piercing cat" into google search you';ll get a ton of hits; one is below in the links to an Aussie designer for an 18 footer. Notice they recommend two 135 outboards..and the cats that run in the Virgin Islands as water taxis and charter boats ( see Gold Coast Yachts) use twin outboard.
What the cost of the 8hp diesel, prop, shaft etc? Howe many x hp outboards can you buy for that? Two outboard gives great maneuverability and one will get you home if one fails.....
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