>How to build a "home built" wing with equal strength and lightness of a
>hollow composite wing?
>
>Any ideas?
>
>--
>Regards
>Erik Wikran
>Tromso, Norway
Hi Erik,
You can come close to the strength and lightness (but not the accuracy) of a
hollow molded wing with the following type of construction:
1. Vacuum bag stressed skin over closed cell polystyrene foam cores with 14
mil Mylar molding surfaces.
2. Use a closed cell foam with a compression strength of 45 pounds per
square inch or more.
3. Use two layers of 1.4 ounce per square yard glass cloth cut on the bias
for torsional rigidity.
4. Use uniweb carbon in gores within the thickest 30% of the chord.
5. Design the gores for the tensile strength required on the bottom of the
wing and use twice as much on the top.
6. Use plywood ribs set into the foam cores to carry the joiner tubes.
The April 1998 issue of R/C Soaring Digest had a graphical design proceedure
for the unidirectional carbon fiber reinforcement of this type of
construction.
Regards, Ollie
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