The Epicyclic gearbox The Epicyclic gearbox was devised in 1781 (as a sun and planet gear) by James Watt for use in conjunction with his steam engines.The concept was adopted in 1902 by Sturmey and ...

It cites the ongoing Norwegian investigation which found “metallurgical findings of fatigue and surface degradation in the outer race of a second stage planet gear” in the epicyclic module.

In boat and airplane applications of the gear and chain system it is usually adequate to select a single gear ratio to drive a propeller in either air or water. Several different types of gearbox are ...