Amodel propeller 1 m in diameter is tested in a wind tunnel. air approaches the propeller at 50 m=s when it rotates at 1800 rpm. the thrust and torque measured under these conditions are 100 n and 10 nm, respectively. a prototype eight times as large as the model is to be built. at a dynamically similar operating point, the approach air speed is to be 130 m=s. calculate the speed, thrust, and torque of the prototype propeller under these conditions, neglecting the effect of viscosity but including density