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58 - Hot Air Balloon Exam Prep - Which of the following options states the working principle of a vertical speed indicator?

Question 58 - Aircraft General Knowledge - BPL Hot Air - Balloon Pilot License

Total air pressure is measured and compared to static pressure
Static air pressure is measured and compared against a vacuum
Measuring the present static air pressure and comparing it to the static air pressure inside a reservoir
Measuring the vertical acceleration through the displacement of a gimbal-mounted mass

Training tests and timed exam simulations BPL Hot Air - Balloon Pilot License