Final answer:
Propellers are made by specialized manufacturers, RPM is adjusted using engine controls, and fixed pitch refers to propellers with a constant blade angle.
Step-by-step explanation:
Who makes the propeller?
The propeller of an aircraft is typically made by specialized manufacturers who specialize in producing aircraft components. Some well-known propeller manufacturers include Hartzell Propeller, McCauley Propeller Systems, and MT-Propeller.
How is RPM adjusted?
The RPM (Revolutions Per Minute) of a propeller can be adjusted by the engine controls. In most aircraft, the RPM is controlled by the throttle, which regulates the engine's power output. By adjusting the throttle position, the pilot can increase or decrease the RPM of the propeller.
Define fixed pitch:
Fixed pitch refers to a propeller design where the blade angle is fixed and cannot be adjusted during operation. In other words, the angle of attack (the angle at which the blades meet the oncoming air) remains constant throughout the propeller's rotation. Fixed pitch propellers are commonly used in smaller aircraft and have a simpler design compared to variable pitch propellers.