REFLECTOR: Molding a P-51 Scoop
Scott Derrick
scott at tnstaafl.net
Sun Sep 4 22:12:51 CDT 2005
Ok, sounds good. Better to get it at HD than order from AS and pay all
that shipping.
Scott
Al Gietzen wrote:
> What would be the best way to go about this? Carve one out of foam?
>
> Any ideas are appreciated.
>
> Scott
>
> I have made scoops, cowling, and other parts; all by carving urethane
> foam. It is cheap and readily available at your local builders supply
> (even Home Depot and Lowes). It comes in 4' x 8' sheets, 2" thick for
> less than $20 (at least it was last I checked). It comes with a foil
> paper covering which you can peel off; cut, and laminate together with
> your favorite fast glue (glue gun works well). One trick to peeling
> the foil off is put some tension on it (horizontally) as you lift it
> up and it comes off cleanly.
>
> Cover the final shape with duct tape so the fiberglass will release,
> or paint with a slurry of alphapoxy and microballoon and use mold
> release. Urethane is very easy to shape, but has the disadvantage that
> you can’t dissolve it out. If you have a shape that you can’t pull
> off, or out, or hollow out and pull in; make your part with just two
> or three plies, then make a strategic cut(s) to get it off the mold;
> then bond together and put more plies over.
>
> One way that works,
>
> Al
>
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