37 heli crashes Heliman Location: lakeland fla
| hi, in horizons book it says .ys 80 users 8.8 gear ratio ,88 tooth main gear and 10 tooth pinion .part#jrp960002 main gear, part#jrp960321 10 tooth pinion, os91 users 8.4 gear ratio use just the 10 tooth pinion, i used just the 10 tooth with my 91os works great |