Need recommendation for rheostat or potentiometer

[Audioguru]

My electric model airplanes use 7.4V to 8.4V (2 Li-Po cells) brushless motors that last forever. The model airplane motors that use brushes need often replacement because the brushes wear out or the commutator paths wear out soon.

 

[(*steve*)]

Can you suggest where to purchase a suitable rheostat to control the thrust of the propulsion fan?

A rheostat with a sufficient power rating would probably anchor your hovercraft to the spot very effectively.

PWM would be the way to go. Restricting the airflow would also probably work well.

 

[Audioguru]

I agree that PWM should be used to control the speed of the motors. A huge, heavy and expensive rheostat was used 100 years ago and worked poorly.