The NP-2000 propeller is an 8 blade design used on the C-130 and E-2 aircraft,which has a radius of 2 m. Assume sea level conditions (p=1.2kg/m ) and a stationary

aircraft such that velocity far upstream is zero. Assume actuator disk theory. a) Consider the blades rotating at 2000 RPM. If the velocity far downstream ofthe propeller is measured to be 40m/sec, find the resulting thrust coefficient. b) For the same RPM, the collective is now changed so that C, = 0.006 . What is the percent change in the velocity far downstream? c) What is the distribution of thrust on the disk? Explain your answer.