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#5
February 22nd 11, 03:30 PM
posted to rec.aviation.soaring
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Winglet performance
"Berry" wrote in message ... In article , BruceGreeff wrote: When asked what airfoil he used on his HP winglets, Dick Schreder replied "I use the ROF-POB airfoil. Questioned further he elaborated "Round on front-pointy on back". I am aware of a lot of Schreder sailplanes with winglets; however, I haven't come across any with Dick's plywood slabs described above bolted to the wingtip rib. Almost all the HP/RS-15 winglets are based on (copies of) the winglets described in the Free Flight page 6 article by Peter Masak.(http://www.wgc.mb.ca/sac/freeflight/92_02.pdf) HP pilots note that winglets definitely improve aileron effectiveness resulting in higher roll rates. Wayne http://www.soaridaho.com/Schreder 
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