Please bear with me as this is a new computer and I'm having a little trouble
getting used to it. The question I have for anyone who would care te express
an opinion concerns the airfoil for a KR2S. The design I would like to use is
the one Roy Marsh developed for the KR2S prototype. It is a modified NACA
230012. Roy won the Sun & Fun 'under 100 hp' race at a speed of 190 mph. He
cruised at 160 and stalled at 45-50 depending on load. He was usiung a
RevMaster VW 80 hp turboed engine. The question I have concerns the depth of
the main spar. It would be limited to 5 1/2" at the root and 4" at the tip.
Roy used 3/32" ply web on both faces of both spars and in addition he attached
a 5/8" spruce strip at the top and bottom of both spars to form an I beam
effect. I would prefer to use 3/16" webs and omit the spruce strips. I have
no idea whether I would be cutting a safety corner. I would appreciate any
comments. Thanks, Bob Tallini.
