Consider a propeller driven aircraft which is to cruise at 150 mph at 10,000 ft altitude using a 6 ft diameter propeller driven at 2500 rpm. The performance specifications for this plane are to be determined based on testing a 1 ft diameter scale model propeller at 150 mph freestream velocity in a wind tunnel at SEA LEVEL. Determine: (a) what engine rpm is required (for the model testing) IF proper scaling is desired and (b) how much thrust is developed by the full scale propeller if the scale model propeller of part (a) develops a thrust of 50 lb.