Option 1 (current)
Drill Motor, low gear, 1:2 ratio, 8" wheels
Calculated Speed: 5.23 ft/sec
Measured Speed: n/a
Option 2 (backup)
Drill Motor, low gear, 1:3 ratio, 8" wheels
Calculated Speed: 3.49 ft/sec
Measured Speed: n/a
Initial ratio -
Failed- Too much motor stress, tripped 30A breakers
Drill Motor, HIGH Gear, 1:3 ratio, 8" wheels
Calculated Speed: 11.63 ft/sec
Measured Speed: n/a
See and feel free to use attached XLS file for calculations.
http://wihs.zapto.org/first/wheel_speed.xls
BTW: The CURRENT drive system, can push a 190 pound adult. ;^]