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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