The motor boat
This motor boat model is more or less 15 years old and we have not digital drawings of it.
Only we explain to you the speed control system used in this motor boat, including the system to go astern.
In this moment we entry inside of the motor boat
The speed control is very much old, but basically one a servo controls a potentiometer in connexion with a transistor.
Also the same servo controls a switch that reverse the the motor turn.
This is the Autocad diagram of the speed control of the motor boat.
In this old fotograph we can see the motor boat in action.