In a high speed high powered descent an aircraft fitted with a CSU could experience the propeller moving to the fullQuestion 19Select one:a.Fine stop and engine leaning to cut outb.Coarse stop and engine running rough due over rich mixturec.Coarse stop and engine over speedingd.Fine stop and engine over speeding
Question
In a high speed high powered descent an aircraft fitted with a CSU could experience the propeller moving to the fullQuestion 19Select one:a.Fine stop and engine leaning to cut outb.Coarse stop and engine running rough due over rich mixturec.Coarse stop and engine over speedingd.Fine stop and engine over speeding
Solution
In a high-speed, high-powered descent, an aircraft fitted with a Constant Speed Unit (CSU) could experience the propeller moving to the full coarse stop and the engine over speeding.
Here's why:
The CSU is designed to maintain a constant propeller speed (RPM) under varying flight conditions. When an aircraft is in a high-speed, high-powered descent, the airspeed and the airflow into the propeller increase. This increased airflow tries to make the propeller spin faster.
However, the CSU counteracts this by adjusting the propeller blades to a more coarse angle. The coarser angle of attack increases the drag on the propeller blades, which prevents the propeller speed from increasing.
Despite the CSU's efforts, the engine may still overspeed because the throttle is open (for the high power), and the aircraft is descending rapidly (for the high speed). The combination of high power and high speed can cause the engine to run faster than its redline RPM, leading to potential engine damage.
So, the correct answer is c. Coarse stop and engine over speeding.
Similar Questions
ailure of the speeder spring in the governor of a CSU will cause the blades to moveQuestion 26Select one:a.Fully coarse with a drop in RPMb.Fully fine with a rise in RPMc.Fully coarse with a rise in RPMd.Fully fine with a drop in RPM
If a propeller governor senses overspeed it will move the propeller blades towardsQuestion 18Select one:a.Fine pitch and increased propeller torqueb.Coarse pitch and increased propeller torquec.Fine pitch and decreased propeller torqued.Coarse pitch and decreased propeller torque
For a normally aspirated engine with a CSU equipped propeller if the throttle and pitch lever are not adjusted a climb to a higher altitude will result inQuestion 38Select one:a.MP and RPM increasingb.MP and RPM remaining constantc.MP and RPM decreasingd.MP decreasing and RPM increasinge.MP decreasing and RPM remaining constantf.MP increasing and RPM remaining constant
For take-off the CSU would automatically set the blade angle of a constant speed propeller at an angle which producesQuestion 8Select one:a.Equal pressure on each side of the bladeb.High drag forces on the propeller to increase power available in the climbc.A large angle of attackd.A small angle of attack
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