*gear reduction unit

[CustomRCmodels]

Originally Posted by Espeefan

Argh! Joe, I know what I did wrong. After reading what you typed I realized it. I can't believe I didn't catch my mistake! Not more then a month ago I answered a question and wrote a 'how to' in the process on Scale 4x4, when a guy asked about ratios.

That completely slipped my mind. Can you guess what I didn't do? I feel stupid now!

Guess I need a different planetary drive now.

did you forget the ratio between motor and the transmission ?
since I wanted to asked you about that ….

[Espeefan]

Originally Posted by CustomRCmodels

did you forget the ratio between motor and the transmission ?
since I wanted to asked you about that ….

I sure did! Sometimes it's the simplest things. You know, I looked up the ratios of the trans and the axles, but forgot about the pinion and spur gears! D'oh. The Wedico AWD 3 speed has a 24 tooth spur gear and it comes with a 14 tooth brass pinion gear. The motor however comes with a 13 and 12 tooth plastic pinion gear. The motor mount is not adjustable on the Wedico 3 speed, so I'm betting they want you to use the brass pinion that comes with the trans. That gives me a missing ratio, which I failed to factor into my calculations, of 1.71. I also have the belt drive reduction that I can't count, without pulling the plate off the trans. Gonna have to do that too!