Challenger
THE "CHALLENGER" was designed to achieve a glider that would thermal well, have a good speed range, with a high lift over drag ratio and still be docile enough for easy handling by a beginner. A definite advantage in competition was accomplished, especially in turbulent windy conditions. The Clark Y airfoil was selected after talking to Bob Bienstein and Paul Crowley about the problems we have with RC sailplanes. Bob mentioned the fact that A.J. Smith won the full-size Nationals a few years back in a sailplane that used a Clark Y with flaps, so it sounded good to me and was selected. This airfoil was designed many years ago for carrying heavy loads while still maintaining high lift. Don't be afraid to load up the Challenger when it gets windy. In Dayton, Ohio last year winds were blowing 25 to 35 mph and I had 27 ounces of ballast in it. It performed beautifully bringing me first place for the day, mainly because of its penetration and stability in rough conditions. Remember, if you want to win in competition you have to go down wind to max-out.
