Sterling Stinson SR8 Reliant 31in ws - RC Groups
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Sep 09, 2012, 07:30 PM
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65stang's Avatar

Sterling Stinson SR8 Reliant 31in ws

So I just won that airplane on an online auction today and was wondering about the plastic parts. Is there any way to somehow reproduce the plastic parts that come with the kit without destroying the originals? I know it would involve vacuum forming, but I've never done that before, so am in the dark. I would like to copy the patterns and build the airplane using all new wood and all new plastic parts as a control line airplane if possible. Thanks for the response!
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Sep 09, 2012, 08:16 PM
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HELModels's Avatar
Depending on the shapes youre talking about, it shouldnt be too hard to make molds using any variety of goops and resins. Use those molds to make solid positives for the vacuum forming, or even use them to make fiberglass or carbon parts. Lots of possibilities. I like making plugs and molds and have only made a few, primarily because it gets expensive quick the bigger the mold. A good goop for small molds is JB Weld. You probably wont find that recommended in the composites forum, but I've had good luck with it.
Sep 09, 2012, 10:52 PM
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Get some mold release wax and get the inside surfaces waxed and buffed a few times. Spray some PVA mold release into the plastic 'molds'. Two or three coats should be plenty. The spray PVA for your spray gun would probably work better in the small sizes you are working vs the 'wipe on with a rag or sponge' PVA. Evercoat's 'Bondo' brand polyester resin and 0.75 oz cloth, a couple of layers, the molds. When cured you have parts! If parts seem a little thin or flimsy just add more cloth and resin. Get the little clear graduated mixing cups. 1/2 oz per cup is plenty. Use ~6-8 drops of MEKP per 1/2 oz. The hotter it is outside the quicker it 'kicks'. Yes, do this outside- it is kinda smelly even though I like the aroma! Any ???'s just PM. It's easy! Financial outlay ~25-35 bucks.

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