Final answer:
While the reference material provides information on the physics of rotating systems, it does not quantify the degree of VOR course Deviation Indicator fluctuation due to propeller RPM. For a precise answer, specific avionics documentation would be required.
Step-by-step explanation:
The question you asked pertains to a specific phenomenon involving the VOR (VHF Omnidirectional Range) course Deviation Indicator in aviation navigation, where certain propeller revolutions per minute (RPM) settings or helicopter rotor speeds can cause the indicator to fluctuate. The specific amount of fluctuation you've inquired about is not provided in the material presented here. However, typical navigation systems are designed to be accurate, and fluctuations due to propeller or rotor interference are usually minimal and typically within a few degrees.
In general, for the scenarios given in the reference material focusing on the physics of rotating systems like propellers and helicopter rotors, the concepts of angular velocity, centripetal acceleration, and the difference between speed and velocity are essential. These physical principles can affect the operation of various instruments on an aircraft, including a VOR system, but we would need to refer to more specific avionics documentation or studies related to the VOR system's sensitivity to RPM to give a precise degree of indicator fluctuation stated in the original question.