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Old January 30th 05, 08:21 PM
Tim Ward
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Tim Ward wrote:


Well, on sailplanes, anyway, you sand to make sure the airfoil is the

right
shape, (shrinkage can occur over the spars after some time out of the
molds), and to make sure that any waves in the contour are less than

.004
inches.


That's another reason to try scraping. Scrapers can be filed to a
particular curve for just that sort of work.

--

FF


The curvature changes continuously chordwise, and most sailplane wings have
taper, so the curvature will change with the spanwise station as well. So
it's difficult for me to see how you could cut a single curve that would
match.
Now, for a constant chord wing, that might make an interesting production
technique:
Build your wing, then build up an extra layer of filler, then "extrude" the
whole wing panel through a CNC cut scraper, getting exact, smooth
coordinates on the way.

Tim Ward