Trimaran From a Tornado Cat

Gents,

I have attacked a lot of other ideas so here's everyones chance - free shot.

I want to build a daysailing trailerable trimaran from the derelict Tornado cat in my back yard. Mostly inland lakes, possibly inland waterways, and a bare minimum of coastline in very nice conditions.

Has any one seen one with a Tornado hull as the vaka? I don't want a bigger boat (tornado hulls should not be the amas), I don't want a cabin. I do want to be able to do the Florida 120 or the Texas200 with some self - righteous suffering, or at least be able to play at being a martyr. I do want to go virtually as fast as a Tornado (classic) singlehanded and fly the vaka in most winds. Probably 150% displacement amas. I'm not wedded to the Tornado mast and sails, but I want similar power. And it should be easily trailerable (I do admire Farrier's folding mechanism but I don't want mulitply redundant structure). Relatively quick setup. I doubt I will spring for foiling or much carbon fiber. I would probably strip plank the amas or use tortured ply. One strange possibility might be a formed, riveted aluminum crossbeam - I have friends building home built aircraft.

Some kind of a cross between the Tornado and Chris White's Typhoon 23, or Newick's Tremolino.

Anyone seen my ideal homebuilt? Or designed it? I haven't drawn anything, not likely soon.

All that should give enough ammunition for comment.

Suggestions? Pointers. Pre-existing boats?

Accepting all.

Marc

 

There can be it not absolutely that that is necessary to you. This boat has been constructed with the maximum usage of a catamaran of the Tornado. The principal case has been made and beams are altered. Tornado arms almost without changes.


I apologize for my bad English.

 

Maybe the solution is here

http://www.nauticaltrek.com/11550-quick

 

I know one of the original Hydroptere prototypes was built with a tornado main hull so thats some nice precedent even though your not looking for a full flying foiler.

Do you have any measurements on your existing hulls? the volume would aid in calculating what sort of displacement there is to play with, if they are Tortured ply I wouldnt think they would have much. The later composite tornados were lighter and had more volume in the hulls.

An option that you might consider is purchasing the plans for Kurt Hughes 23daysailor and building the amas in cylinder mold they have much more volume and have less compromise in shape than the equivalent tp construction.

http://multihulldesigns.com/designs_stock/daysail/23_tri_day.htm

The interesting thing is that I was reading Richard Harris's book on trimarans and in it Meade? Gougeon was saying that on Victor T with its planing floats (his term not mine) he could hike the whole boat out of the water onto the float with the aid of dynamic lift.

 

T tri

upchurchmr, you should consider getting past your hesitancy in using foils.
One big reason is that you said you wanted to fly the main hull:the problem is that with 150% amas you're going to have a whole lot of a (probably) shorter ama immersed. And, you should really do some preliminary calculations(not hard) to see what the RM of your proposed boat is likely to be because most small tri's cannot fly the main hull until its blowing 15 knots or more.
Foils can help you to achieve the performance you want.
Good Luck!

 

T tri

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SerjKu, that's a very good looking tri! Thanks for posting it.

 

Serjku,

Very nice looking tri, but bigger than I want. Mine should have a Tornado hull for the main hull, with smaller amas. I don't expect to sail with more than 2 normally.

Basil,

I had seen Quick before but could not tell enough to see if there were features I want. Do you know if there are other pictures of the folding method, possibly including folded on a trailer? Thanks.

Corley,

I don't have a volume of the Tornado hulls, yet. I am trying to get myself going on relearning my old solid modeling skills - lots of procrastinating.
The original plywood and fiberglass boats both met the same measurement rule. Don't know if they changed it in the last 15 years along with the expanded rig. I have seen articles talking about widening the bow as much as possible within the measurement rule being a good thing.
My desire would be to not add significant weight, but considering the Tornado cat when flying has all the weight on one hull, it seems that that hull as a vaka will be adequate, and when sailing will be raised from its static waterline in any wind. Drifting -the vaka should support all the weight by itself. That should be a reduced surface area from the cat (even assuming 400# + crew instead of 320# + crew). If it were equal surface area, I would be very happy.
The Hughes 23 amas would probably be much more that I need, since I want 20' vaka length, and the boat should have a lighter total weight. He does have a 20' tri.
I was always interested in the Gougeon boat, but I think we both read the description in the Harris book, any more data?

Doug,

I certainly want to fly the vaka, I just don't expect it to be in very low wind. I don't know the actual wind for flying the tornado, but unless you sit on the lee side it still takes some wind. The foil question is a matter of money and reality about whether I would ever finish that project. My assumption is that foils in the same place as Hydropter could be added later.

Marc

 

Has found in the computer

 

SerjKu,

Thanks I have never seen this boat.

Marc

 

----------------------------
It's a prototype for Hydroptere.....

 

Your solution is http://www.trinardo.com/ Kjell has designed a new hull to go with the Tornado amas for low wave conditions in Sweden, which should suit you perfectly. The lines are available for his website and you will find him most helpful.

I used his the basic design but increased the flare (with his help) as well as the volume of the amas to handle bigger wave conditions.

Regards

Alan

 

You may check out the Tremolino. It was designed for Hobiecat hulls.

 

======================
Alan, in the first(and seventh) post he said that the Tornado hulls should not be the amas-he was looking to use one as the main hull.
This is a good looking design....

 

Alan and Gonzo,

Thanks for the suggestions.

But.... I really am interested in going smaller. Tornado hull for the Vaka. It does not seem to be a very popular idea, most people want more room in the Vaka for carrying people. I am looking for 2 people max.

Marc

 

upchurchmr, what will the tri do better than a cat? And if she is flying the vaka, what's the purpose of it? So maybe then three tornado hulls?

A cat with wings is the way to go square.

The smallest successful beach tri we have is the Weta, and it's vaka looks to have more buoyancy than a tornado hull, and it's 14ft.

Everything is right with having a slim fast vaka at the waterline, but fundamentally why a tri? better seating? no trapeze? these are "also reasons"