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RC Glossary


New to the RC Hobbies? What does buggy, bulkhead, nitro mean in radio control car hobbies? Check out the glossary for remote control cars below.

Final Drive Ratio --

The transmission ratio determined by combining the internal drive ratio and the spur/pinion combination. It is found by multiplying the primary gear ratio (PGR) by the internal gear ratio (IGR). EXAMPLE: a model with a PGR of 3.818 and an IGR of 1.7 would have a FDR of 6.49:1 (3.818 x 1.7 = 6.49). Not including rollout, this is the total ratio of a model's drivetrain. If you are trying to match the gearing of another driver who uses a different pitch pinion/spur combination (64 pitch instead of 48 pitch, etc.), or a driver that uses another brand of car, you can use this formula to get a better idea of what to use. Just get the internal drive ratio of the other car and find out the pinion/spur gears that are used, then adjust your gearing to match the final drive ratio of the other car. Remember to account for the motor being used, modified motors vary widely as more or less turns are used, and even stock motors are different from their construction, brush or spring usage, etc.
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