Motorize 42171 Mercedes formula 1 car.

[Fcrocks]

Hi Everyone.

Im new to this website and this is my first post. Nice to meet to you all. 
 

I recently modified my 42171 Mercedes formula 1 car to fit 2 RC buggy motors. Connected on 1 axel going through the top motor (higher rpm). Does any know what gear ratio I should be using so that the car goes as fast as possible? (Currently my gear ratio is 1.57:1. 14 teeth gear driving a 22 teeth differential)

additionally if I should change the gearing again if I end up including a 3rd RC buggy motor.

thank you very much for the help. 

Edited September 17, 2025 by Fcrocks

[Jurss]

Don't forget, that cv joints may not handle torque from many buggy motors. To go fast, it would be good to implement gearbox, so You can start slowly. Otherway, just trial and error mainly, then You can figure out, how fast it can go.

[allanp]

Like any engineer will tell you, it depends! 

If you are driving it indoors on carpet then you'll need more torque to ensure you can accelerate quickly and reliably. If you can get access to a much larger surface with low rolling resistance (like a carpark, a nice walking path in a park or even an indoor sports hall) then you can gear for a higher speed. It will also depend on what batteries/power source you are using, if you intend to use lubrication, ambient temp (as that can effect some battery types) and so on.

Trial and error is the best way.

[Fcrocks]

Thank you for the advice