Met-Co-Aire says that its Hoerner wingtips "will add to the performance of your aircraft." They say the Hoerner tips will increase aircraft range by 1 to 2 percent, increase the rate of climb by 60 fpm, boost cruising speed by 3 to 5 mph, cut takeoff distance by 15 to 20 percent, reduce stall speed by 4 to 5 mph, and improve overall aircraft stability.
Remember, this is a "marketing claim". Larry Flesner aerodynamics - Why is it rare for small aircraft to have winglets ...
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