Gato, lets assume you're going to use your existing profile. Can you please email it to me and I'll use its geometry when defining laminates. Do you have access to a tube for the track? do you definately want to strip plank or is ply an option? Whats the minimum practical thickness for your stripping system?

I will get you the profile, and I can put you in contact with the French arcitect who has the original alu spar or profile. (comming from a Mattia cat 20 feet+)
I deffenetly want to try one in stip. For the ply there is no option 4mm the thinnest you can find in a wood producing country like Finland (this one made in France...)

Scarecrow,

"(all care no responsibilty)", I dont think anybody expects more than that from advice/work given freely. I for sure sure dont. <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />

Gato,

I looked at getting some WRC, and it was very expensive. I dont know what prices you get, but for me it is either spruce (we can select our planks ourself) or all carbon. Would be interesting to know what you pay for carbon and WRC in Finland. Spruce is cheap here, and we have tracked down a local source for carbon fibers at EUR29 a Kg.

WRC 2500 Euros/m3 Carbon BX 310g 35 Euros/m2 Custom made epoxy around 7 euros/kg.

So Rolf, Shall I take some epoxy and come over to Norway to buy my carbon, I think it will pay the trip.

I will make the strips from 4mm ply, and the tube for the track (sail) I will make myself in glass or carbon

It is a very special deal we have got with a manufacturer who thinks our project is cool. Basically we get to buy leftovers from their production of uni, bi and triaxial cloth for our own use in this spesific project. Cloth weight and length is limited. From 4 to 20 meters and heavy weaves, but as we pay for the kilo we can live with that.

Sh...t, I was alredy trying to find a big lorry <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />

Just wondering if somebody did supply the data.

Of course not. I'll do it from scratch it will just take a bit longer.

Rolf, you could always strip plank a female mould and then make a straight carbon mast.

Scarecrow,

I'll try checking with some of the other guys to see if they know the numbers on the current masts. As the superwings are extruded by AHPC, it is possible that they have not run the numbers on it but gone by experience when doing the die.

Female mould and laying up a 'classic' carbon mast is a possibility. Doing it in wood would be a more fun project on the other hand. <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" /> But I am always willing to listen common sense.. Anyway, it is not for this year. We are using old Tornado masts for now.

My bad I thought the superwing was the default mast extrusion that wouter refers too any generally successful F16 mast will do.

Feamale or male, think you end up with the same amount of sanding, it's just a question if you want to do it on the mould or on the spar.
The thing with this metod of using stip planking is that it's easy, cheep and a fast way to get a staight or even a tapered mast.
when I started my first one I had been expecting a lot more work.
I would be more than happy if enyone takes the advise and use it to make a mould

Folks,
I do not want to interrupt the flow here so I will make this short.
The fact is I keep all my emails both sent and rxd. I went looking back through them to find some mast deflection data and stumbled across emails about work I was doing on a composite mast.
Back in 2003 I made a carbon composite section 6m long and did some deflection tests without and then with cardon on the outside of the section. It's kind of nostalgic reading through the old emails. From the emails it seems this was just before building the Blade prototype.

How time flies.

I also did comparative deflection tests with a superwing and Aussie wing of the same length so I could see how this project compared. (The Aussie wing 50x125mm extruded in Australia in the 80s to combt the importation of Sori sections for the A cat fleet. But in reality it was too heavy.)
I have rough sketches that include all components and layups I used.
Anyone interested in doing a bit of experimenting I'd be happy to send these emails to you so you can either improve on what I had tried or just say oh well it is better done some other way.

It seems from the emails I had worked out a way of modifying the technique to produce an F16 mast that would weigh around 9.91kg without fittings. How is not detailed in the emails. But If pushed I could probably work it out again.
I never actually sailed with this mast just did static deflection tests. So no guarantees.

Anyhow just thought I'd mention it.

Regards,
Phill

I now have all the data I need (thanks Phill). I should have a mast for you by next weekend.

Gato, what sort of timber will you be using?

F16 mast design is done. Will let Gato work out the bugs before giving it to anyone else though.

Theoretical tube weight with 4mm gaboon ply (stripped) core approx 11.5kg. Real world this will go up due to bog etc. Timber makes up about 45% of the weight.

So friends, what do you think, I started to build the F12 cat that Scarecrow designed. Personally I think it would be fare to him to build the mast for the F12 first using the same method. My intention is to have this one in the water before end of may, and to be able to present it to the clubs at the opening of the season.

Gato,
do you ever get out of the shop ? <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
Just joking but you seem to have a lot going on. Good luck with the new project and please post pics.

What do I think? I wonder how you are getting all this stuff done! Otherwise, I think it is great to get some F12s in the water. It is also really inspirational to see what is done, the results, and the spirit of cooperation. Fantastic.
We are busy stripping hull halves and building bulkheads. But next year, I have a hunch a strip/ply mast will be a project.

There are no secrets, I sold my television about ten years ago <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />