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shaped parts

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apilot(at)surewest.net
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Posted: Wed Mar 05, 2008 10:53 am Post subject: shaped parts

I use the lightweight sheet rock patch material that Lowes and Home Depot sells. It sands easily.  If I have a large part, I rough cut blue foam and then fill the exterior with the sheet rock patch and sand.  On flat sections, I use aluminum foil tape for strength.  Other hint is to make sheet metal parts, you can use aluminum flashing backed with blue foam and rivet where necessary. I extended my trailing edge of the wing tips and tested them to 100 mph.  You could overwrap with fabric, but it is not necessary.  My custom winglets of lexan with extended wing added up to 6 lbs. and it now a delight to fly with rudder only (hands off). Stall speed is down to 36 mph (with VG's)  Will try to get slower with elevator gap seals and underside VG's.

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