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Posted for <13brv3@mchsi.com>:
Greetings,
I will have to make some cowl bumps for clearance, and have a question for
the plastic plane types. I'll need some foam that is easy to sand to shape,
and notice that Spruce has "polyurethane foam" that sounds like what I need.
Is there anything like this that's obtainable locally? Some sort of
building material, or craft item? Thanks,
Rusty (I hate fiberglass)
Turbo 13B powered RV-3 (experimental aircraft)...Be Afraid :-)
1993 RX-7 R1... Not stock, carry bail money :-)
[You can use just plain ol' styrofoam, available at the local building supply place in the insulation area. It's a bit messier than the urethane foam, but a fraction of the price... and for a couple little cowl bumps it's just the ticket. Get your basic shape in the foam, put a layer of bondo over the top to fine tune them, then layup a couple layers of bi-directional glass cloth for your structure. Once everything is cured up, remove the foam, sand out the excess bondo, bondo the irregularities on the exterior, sand & finish. I'm attaching a couple pictures of a scoop that I made for that Eagle540 installation I've been working on using styrofoam... proof that it works just fine. I skinned this scoop (it's for our 3rd intercooler) with carbon fiber, but that would be way overkill for a little bump. This scoop was much more complex than a simple cowl bump, but emminently doable. I hope this helps. <Marv> ]
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