Design the ultimate Frankenboat-1) for Speed in water; 2) for comfort; 3) how fast to get done

G

guerdon

Anarchist
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santa barbara ca
Get two NACRA 5.8 cats splice them butt to butt, add arching crossbeams and a lee pod and you have a Cheers cheapo. You can do it. You could also use Prinldle 18 , or H18 ,but they are harder to find with sound hulls. Make it happen, Franken boats keep the fun in fundamentals.
 
M

mathystuff

Super Anarchist
1,245
868
An austrian couple build a tri from a soling. Looks nice.

Soling-trimaran-3.jpg
 
C

cje

Anarchist
611
98
That outboard might just stay in the water now. I had a soling with side mount 1.5 johnson. I tossed it one night after pulling it for over an hour. It was a long sail home.
 
V

Ventucky Red

Super Anarchist
11,933
1,493
Put the NACRA Carbon 20 mast, sail plan, and rudders on a Hobie Fox... ummmm wait a minute, wasn't this done by some record holders?

Not a big Hobie fan, but this is a good looking boat


1657394737578.png
 
Rasputin22

Rasputin22

Rasputin22
14,550
4,090
The WASABI started out as the TRES AMIGOS and was intended to use the very nice and robust Supercat 22 hulls but I ditched the complexity of the molded crossbeams in this render for simple sliding telescopic beams on the WASABI. Still looking for the spinoff folder of the WASABI renders from the later permutation of the project. ]

1657404158589.jpeg


Funny looking back at this project how much it looks like HUMDINGER. Here is the later version with the telescoping cross beams.

1657404330443.png
 
david r

david r

Anarchist
628
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pond
^ interesting article. Building a tri from other boats does not look to be that easy, and probably you end up with a slower boat that is hard to move around and too wide to fit in some slips.
The curved boards like the M32 and Malolo have might change the need for lots of buoyancy in the amas. The article seems to be saying the amas should have a flat bottom since he doesn't recommend V or round bottom amas.
Was thinking the easiest one to build up would be to stick with hulls from 1 manufacturer like supercat or nacra so that the beams could bolt easily to all the different sized hulls. An example would be a big nacra hull in the center with smaller nacra amas using curved boards, and the rig from the cat that the center hull came from.
I was thinking that if the boat was not super wide the amas would have a better chance of supporting the loads, but the curved boards might help with that too?
Was curious about the soiling/tornado tri. is it faster than a stock soiling?
 
MultiThom

MultiThom

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Benicia, CA
Some of his examples seem real world, but he (author) is biased and wants folks to buy his designs (not an unreasonable attitude). Note that his assumptions are that the donated ama float isn't big enough to support the boat weight and that therefore, you cannot build light enough vaka. He also assumes buoyancy rules and ignores dynamic lift. Also assumes you want it to fold. All of those assumptions are reasonable, but what does a frankenboat designer want? Cheap, quick, or just float about on a hot day?
 
david r

david r

Anarchist
628
73
pond
The site smalltridesign.com listed above seems to mostly have information. He is selling plans for his W17 and W22 somewhere there, but it isn't the obvious focus. That W17 seems to sail pretty well based on his youtube video. It turns out he uses a flat bottom deep V for the amas. That is pretty much the same hull shape that the Sharkeater homebuild had from the days of my youth.
So this designer of the W17 gives good info i think. He also has a 22 but the links to it are quite old so it doesn't look like many are getting built.
 
MultiThom

MultiThom

Super Anarchist
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501
Benicia, CA
I'm wondering if anyone has gone all the way Frankenboat. Buy a open sportboat, something like this

1657578675653.png


(this is an open 5.7 sportboat). Weighs about 1000 pounds, but that includes a keelbulb which you'd eliminate leaving you with about a 700 pound vaka. It already has a respectable sailplan. Has dual rudders. Note the planing hull (like a big Weta). You would than need crossbeams (which you probably would have to make) and a donor catamaran. It "ought" to be pretty quick. It's designed to sail with the bulb and bodies providing leverage to keep it upright. It won't point as high as it would if you kept the keel bulb (5 foot draft).
 
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