# Compound gear-train sizing
# Scope: Two ideal external gear pairs; losses supplied as one efficiency.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

driverA = 20
drivenA = 60
driverB = 15
drivenB = 45
speed = 3000 rpm
efficiency = 0.9

ratio := drivenA*drivenB/(driverA*driverB)
output := speed/ratio [rpm]
torqueMultiplier := ratio*efficiency

check output speed target: output >= 300 rpm

scenario alternative: driverA = 16