would be ineteresting to see what's all in there? (plastic/metal/what?). My German is a bit rough , but from what I cansurmize in his threadhe used PGM-37 motors that rotate at about 170 RPM's. he's used them on other tanks with no problem. he did say speed is a bit limited but the motors are rated for up to 12v so a bigger battery could always betried(he thought an 8.4v would be perfect).I found some, but not sure if there's anything comparablehere in the US. There appear to be 3 different versions with different gear ratios, I can't figure out which one would be the best ratio to use on a 1/16 tank..I'm thinking "1:30" ......

http://translate.googleusercontent.c...XedVGDq0cK-xng