According to the flight velocity

the required thrust and rotation speed of propeller

the three-blade propeller of an aircraft was designed

and the chord length and pitch angle distribution along the radial direction of propeller were obtained. The three-blade composite propeller (diameter of 1.75m) was manufactured based on the designed results

and the thrust of this propeller under various rotation speeds was measured using a propeller test rig. In order to obtain the dynamic performance of propeller

the scaled propeller(diameter of 0.96m) was manufactured

while the aerodynamic performance data of thrust

torque

power and efficiency were measured at the three-dimension test section of Northwestern Polytechnical University NF-3 wind tunnel. Results show that the maximum efficiency of propeller is 85.63%

this three-blade propeller is suitable for the 70kW engine (for example: Rotax 912)

so this designed method of propeller has good applicable value.