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#7
September 12th 05, 01:10 AM
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wrote in message oups.com... The Wortmann FX-67-K-170 airfoil that the PIK-20 and Nimbus 2 use is very sensitive to bugs, and even a very small amount of rain. With a waxed wing surface the rain drops tend to stand tall, severely separation the top surface air flow. Leaving the wings sanded and unwaxed allows the rain drops to flow more smoothly on the wing surface; significantly reducing drag. However, only a bug wiper system appear to help the bug problem. I sand the wings on my Nimbus 2 and they seem to deliver the advertised L/D. I have tried surfactant on a few gliders and, by appearance only, it seems to work. A capful or two of dishwasher "rinse clear" or "spot free" or something like that in a bucket of water seems to be enough. As for the bugs, as slow as I fly, they have time to get out of the way. Bill Daniels 
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