I need to know what size cloth and how many layers to use on a F15 nose mold which is about 29" long. This nose was made from Ivan Munninoff F15 plan. Thanks Rick

Rick,
I'm not familiar with the size of the F-15 you are talking about and a 29" nose seems like a big one so depending on size you can layer with 2 then 4 oz (light version) or 2-4-4 or 2-4-6 (heavier). I would recommend laying it at 45 deg bias to get the cloth wrinkle free towards the tip of the nose.

Or are you talking about making a split female mold to duplicate what you have? In that case make the mold as thick as you want but not less than 1/8" thick. I don't want to ramble on until I get clarification on what exactly you want to do.

I allready have the plug and molds made just was not sure what to lay up the parts with. Rick

Rick, a friend and I have built one of these. We used one layer of 3/4 oz. (on the outside) a layer of 2 oz. and a layer of 6 oz. It feels a little flexible when put together, but the nose gear former stiffens it up quite bit.
What engine and fan will you use?
Ours really performs on a K&B 7.5 and Turbax fan.
The OS 46 VX would even be better.

Good luck,
Jim

You shouldn't need more than a layer of 2 oz. and a layer of 6 oz. on the F-15 nose. Additional layers only add weight. You can lay a piece of 2" tape longitudinally on each side for a distance if you want a bit more rigidity. If you have issues with flex, it may be the resin you're using. When using epoxy if the mix ratio is not correct, you can create a situation in which it never fully cures and stays a bit "rubber ducky". Sometimes it's just the brand of resin you use also.

Larry

Thanks for the info. I have fitted a Dynamax in it thinking of putting a 77 or 91 in it. Their might be a problem with the head sticking out of the fuse with this setup. Rick