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so just plugging the fan into the receiver wont give variable speed?
Also, wouldn't buying a RC tank and taking it apart be more expensive then buying a receiver/transmitter and some servos?
u would need to use a microcontroller to do A2D from a servo receiver and then connect a pin from the microcontroller to the fan. Then you would need to do a relay or H bridge to switch the motors. ( remember motors need backwards polarity to turn backwards while servos just need a different pulse)
for movement, maybe get a rc tank,
technically all i need is a one channel remote, i could just hook a servo up to a balsa wood rudder and steer like that