Having instructed technical subjects for many years, I always admonish students that I will use analogies for introductory lessons, but will attempt to draw the line when the analogy starts to break down.
Example: Helo turbine engines have a governor to hold a constant rotor speed through climb, cruise, descent, & hover; fairly similar to cruise control of your auto. If you climb too steep a hill in your car, it "runs out of steam" and the car slows down. Likewise if you pull too much collective in your whirly. The details of why this speed falloff are DIFFERENT in the two cases.