Scale modelling & RC

Gearing, grades, scales: the mechanics of modelling, from RC tracks to model railroads.

• Model railroad grade: the calculation before the saw

  Work out your ramp’s grade (rise ÷ run) and the length needed to stay under 2% — before cutting the first riser.

• RC gear ratio: pinion, spur and theoretical top speed

  Work out your RC car’s final drive ratio and theoretical top speed: kV, battery, pinion, spur, internal ratio and tire diameter.