пропеллер спроектирован под этот самолёт, а вибрации
Скорее всего из-за материала - фюзеляж углепластиковый и пропеллер заточен под "большие" (т.е. 250 км/ч для этого пепелаца) ск-ти
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The propeller is a critical component of Yates’ record setting attempts. On an average airplane, the propeller is designed for a wide range of speeds, and because of that, isn’t particularly good at any specific speed. The propeller on the electric Long-EZ was designed by Craig Catto specifically for the speed flights.