![]() It can also be used with two steps on the top (KFm3), or two steps on the top and one on the bottom (KFm7). ![]() The two patents, US Patent # 3,706,430 and US Patent # 4,046,338, refer to the introduction of a step either on the bottom (KFm1) or on the top of an airfoil (KFm2), or both on top and bottom (KFm4). The two men then filed for a patent on the stepped airfoil.įurther development resulted in two patents and a family of airfoils known as the KF airfoil and KFm airfoils (for Kline–Fogleman modified). ![]() He presented the paper airplane to Floyd Fogleman who saw it fly and resist stalling. After many experiments he was able to achieve this goal. ![]() In the early 1960s, Richard Kline wanted to make a paper airplane that could handle strong winds, climb high, level off by itself and then enter a long downwards glide. ![]()
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