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What is the old thumb rule to design a propeller?(a) Keep it as long as possible(b) Keep it as short as possible(c) Keep it as short and wide as possible(d) Keep it as half of diameter alwaysThis question was posed to me in an online interview.The doubt is from Propulsion topic in section Propulsion and Fuel System Integration of Aircraft Design

Answer»

Right choice is (a) Keep it as long as possible

The explanation: ‘Keep it as long as possible’ is old thumb rule for propeller. However, the LENGTH of the propeller is limited by the TIP speed. Propeller tip speed should be below SONIC speed.



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