Undeterred, the brothers built a wind tunnel to test for wings that gave the best lift, ultimately going with an anhedral, or downward, wing design supported by front elevators.

兄弟俩没有被吓倒，他们建造了一个风洞来测试能够提供最佳升力的机翼，最终采用由前升降舵支持的上反角或向下的机翼设计。