Gear Ratios

[riks]

GEAR RATIOS. A good idea for any gear ration setup wether for auto racing or microflight motors is always use an odd number of teeth in at least the pinion gear(smallest/driver) so you always have a ratio that is in not an even number 10/50 = 5 to 1
11/54= 4.90.9.. An even set of teeth always engage the same tooth once each revolution while an odd set does not. Simply the odd set will wear longer and ensure a smoother mesh.

[flyingbuddy]

Good point, but we're talking about motors/gearboxes with an expected life of a few hours, at most. The brass on plastic and plastic on plastic gears don't wear as quickly as the rest of the plane, so I wouldn't worry about it. It is a concern on the more expensive gearboxes, but this is usually addressed by the manufacturer already. Some gearboxes even have helical cut steel gears!

[flyingbuddy]

Based on your recommendation, of the GWS gear ratios that should have more even wear, the DX-D, DX-E and DX-F have odd ratios. Again, I would not use that as a major factor in a decision against a particular motor/gearbox combo. This is just my 1.3 cents worth!

[riks]

Well if the transmission life is only a few hours which I did not consider then odd or even is no concern. ****