Mechanical speed controllers use a network of resistors and switch between them by rotating a head with an electrode around a plate that has electrical contacts. Mechanical speed controllers are prone to being slow to react because they are actuated by servos, waste energy in the form of heat from the resistors, commonly become dirty and perform intermittently, and lack a dedicated braking ability. They appear only in vintage RC models, and are now essentially obsolete.
mechanical speed controllers use a network of resistors and switch between them by rotating a head with an electrode around a plate that has electrical contacts mechanical speed controllers are prone to being slow to react because they are actuated by servos waste energy in the form of heat from the resistors commonly become dirty and perform intermittently and lack a dedicated braking ability they appear only in vintage rc models and are now essentially obsolete