The thrust F of a free propeller either aircraft or marine depends upon density

The thrust F of a free propeller either aircraft or marine depends upon density P the rotation rate n in r/s the diameter D and the forward velocity V. Viscous effects are slight and neglected here. Tests of a 25-cm-diameter model aircraft propeller in a sea-level wind tunnel yield the following thrust data at a velocity of 20 m/s:Rotation rate r/min480060008000Measured thrust N6.11947(a) Use this data to make a crude but effective dimensionless plot.(b) Use the dimensionless data to predict the thrust in newtons of a similar 1.6-m-diameter prototype propeller when rotating at 3800 r/min and flying at 225 mi/h at 4000 m standard altitude.