Instructions
Read each problem carefully and calculate the correct ratio of engine RPM to propeller RPM. Show your work where necessary, and explain your answers in complete sentences for the short-response questions.1. Calculate the ratio of engine RPM to propeller RPM for a small aircraft where the engine operates at 2,800 RPM and the propeller spins at 1,200 RPM.
2. If the engine RPM is 3,200 and the propeller RPM is 1,400, what is the ratio of engine RPM to propeller RPM?
3. A turbine engine operates at 2,500 RPM, driving a propeller at 1,750 RPM. What is the ratio of engine RPM to propeller RPM?
4. Explain why the ratio of engine RPM to propeller RPM is important in aviation. What factors might affect this ratio?
5. If the engine RPM increases by 10% while the propeller RPM remains constant, how does this affect the ratio of engine RPM to propeller RPM?
6. A pilot notices that the engine RPM is 2,600 while the propeller RPM is 1,800. What is the ratio of engine RPM to propeller RPM?
7. If the engine RPM is reduced to 2,000 while the propeller RPM is maintained at 1,100, calculate the new ratio.
8. Explain the purpose of a tachometer in monitoring the ratio of engine RPM to propeller RPM.