Which of the following is correct for two blade propeller?(a) Diameter d = 22*(Hp)^0.25(b) Diameter d = 22*(Hp)^0.56(c) Diameter d = 12.22*(Hp)^0.25(d) Diameter d = 2.2 ftThe question was posed to me in final exam.My query is from Propulsion in section Propulsion and Fuel System Integration of Aircraft Design

Which of the following is correct for two blade propeller?(a) Diameter

1.	Which of the following is correct for two blade propeller?(a) Diameter d = 22(Hp)^0.25(b) Diameter d = 22(Hp)^0.56(c) Diameter d = 12.22*(Hp)^0.25(d) Diameter d = 2.2 ftThe question was posed to me in final exam.My query is from Propulsion in section Propulsion and Fuel System Integration of Aircraft Design
Answer» The correct option is (a) DIAMETER d = 22(Hp)^0.25 Explanation: An initial estimation of propeller diameter is GIVEN by, Diameter d = 22(Hp)^0.25. Where, Hp is horse power. Above equation provides APPROXIMATE VALUE for 2 bladed propeller diameter.

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