Righto, go your hardest!

Can I get a scuba set with it?

Folks,
The simplest and easiest ply hulls you can build would be deep skinny symetrical bannana shaped hulls.
No c/b and no skegs and bugger all tooling up.

Windrush produced a 12ft surfcat in glass with spade rudders that sailed quite good (even upwind) with this style hull and the kids at my sailing club and some of the parents used to have a ball on them. Sometimes sailing 3 up.

Dead simple to do in wood.
If I was doing it in timber I would glue 2 lengths of ply to a 2 inch wide keelson of cedar.
Halfway up the hull sides would be a stinger each side full length.
Cedar props between the stringers to give only slight curature. (As perfectly flat panels are not very stiff.)
The deck would be sold foam with a layer of glass laminated underneath. Shape the top of the foam to a preset deck curve and a couple layer of glass on top.
This would not only be a deck but also provide floatation.
The way you shape the deck will dictate how asthetically pleasing and modern the boat looks.
I've not done the calcs but my guess would be maybe 12kg per hull. Just a guess.

One off would probably take several weekends but if you set up production line style you would probably average a pair of hulls per weekend.

Quick , easy , dead simple and dirt cheap.

BTW:- As the panels are essentially flat you could build these from any material you like but some materials may need a bit of tooling.

Regards,
Phill

I started sailing on a 12 ft surf cat(windrush) When I was still in nappies.
31 Years later I got another one($250)and took my two year old out on it. The one I started on (sailing every school holidays) is also in the back yard. These were great boats. I have two boys 3 and 1 and the boats are there waiting.

See also posting ;

http://www.catsailor.com/forums/showthreaded.php?Cat=0&Number=95089&page=&vc=1

wouter

On the subject of simple fast build hulls, this is something I put together this time last year, never got round to making it, maybe I will this year. The idea was a 10ft boat hull that could be built from a single sheet of 3m x 1.5m ply, it could easily be scaled up to an F12 , in fact I have a parametric CAD program that will produce drawings of any size you want.




The hulls are asymmetric and shouldn’t require a daggerboard. The nice thing about it was the minimum amount of cutting required to make the panels.

The attached PDF file is a hull template that you can print off and make yourself a model. The two sheets contain identical panels, just layed out on the sheet in different ways. The first sheet is meant to show that the same cut produces both side panels, i.e. two sets of side panels (for two hulls) can be created with just 5 cuts instead of the usual 8.

The second sheet is to aid model building out of a material that can be folded such as card or paper i.e. the three horizontal lines in the centre of the panels should be folded not cut. All the panels are flat with the exception on the four outer leaves of the side panels which require some gentle bending.

Print it out and try it


http://4hulls.googlepages.com/flatpack3.pdf

Gareth
www.fourhulls.com

Some more views







And an edrawing file that you can view a 3D CAD model with a free download from

http://www.solidworks.com/pages/programs/eDrawings/e2_downloadcheck.html

http://4hulls.googlepages.com/F10.ePRT

Gareth
www.fourhulls.com

The beams would spend a lot of time trying to drag extra water up wind.
Smaller Paper Tiger would do job and use less than one sheet of ply amd beams are just box section bolted.
This desgin could easily be shrunk to ten or twelve but realy we want to use what advances are appropriate since '75.

I have been thinking about this alot and talking to an older neighbor who usually has alot of good ideas about alot of stuff.

Here are a few things that he pointed out.

-The boat must be simple ( we already know this, but simple to us isn't simple to a mother trying to put this boat together for their kid.)

-The boat needs to be storeable in a very small area. And it needs to be able to fit through a gate so that it can be put in a backyard very easily.

- It doesn't have to be fast, just give the sense of speed. Also it needs to be able to be sailed in very shallow water.

- Every connection needs to be done with the quickest thing possible. No pins and split rings, they are difficult to use for anyone with bad eyes.

-The sail needs to be rugged. If it gets left outside for a couple of days it still needs to be okay.

-If we are going for car toppable then we will have to make sure that a rack is made that is very easy to use.

He has some other ideas and comments about the idea of a small cat. He has a few grandchildren and said that if some company starts making this boat he would be willing to buy one or two. Granted he has alot of money and likes to spoil his grandchildren but I think more of these would sell then some people think will be.

Thanks Gree2056,

I've not mentioned how to transport the F12 yet but it is under consideration.

I would really like to keep the hulls, beams and tramp attached at all times as then rigging and unrigging will be very easy indeed. I'm hoping that a 12x6 foot platform will be small enough to be left fully assembled. It will pass through a gate I'm sure, especially if the gate is low and the boat is on top of the car.

Seriously I'm thinking about a setup where the dolly remains under the sterns of the boat while it is loaded onto and off the car. The bow can then be layed on rollers fitted to the roofrack and the boat can be push onto the roof by the rearbeam while lifting only 15 kg as the bows/rollers carry the other 15 kg. In the garage the platform could be hoisted to the roof with roofrack remaining attached.

Stuff like that. It is under consideration.

Again the rigging is very simple, currently there are no pins or rings. Blocks stay on the sail and boom and you only need to run the sheet through the blocks after stepping the mast with sail.

Quote:

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-The sail needs to be rugged. If it gets left outside for a couple of days it still needs to be okay.

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Plain dacron will hold up for many years despite heavy abuse.


Wouter