[Dick Linn]

Look for the Gear Ration Calculator Spreadsheet in the PAPERS section - under TECHNICAL. It's about the second page down. This should be the one originally provided by Frank Saladino and it is very useful for both single and multi-stage gear reduction.

You'll have to decide how fast you want to go or what you want to pull. The drill motors on low with this year's 10:45 sprockets would be about 4.4 Ft/sec with the 12.5 inch wheels. Last year, using the 2:1 gearbox and the stock 8.75 wheels gave somewhere around 7 ft/sec with the drill motors in low. 5 to 8 ft/sec is in the ballpark unless you have more motors or a gear shifting device.

The Chiaphua (Atwood) motor runs around 5000 RPM at no load. The drill motors in low are probably less than 400 RPM after you adjust for the forward/reverse speed difference, so you'll need quite a bit of reduction.