Last Year's Gear Ratio

AndyB · #1 10-11-2007, 23:35

Ok, so on your drive, what was your final gear ratio after gearbox and sprocket reduction. Keep in mind that the KOP transmissions are about 12:1. (Assuming a 6" wheel size with four CIMs. If anything else, please specify)

<10:1
>10:1 and <12:1
12:1
>12:1 and <15:1
>15:1

If you used multispeed gearboxes, post your ratios.

269 used a 15:1 ratio using worm gears.

Tristan Lall · #2 10-11-2007, 23:43

For this to be meaningful, you also need to describe wheel size....

Guy Davidson · #3 10-11-2007, 23:43

16:1, banebots with the added stage, 6" wheels.

Doug G · #4 11-11-2007, 00:34

Also for this to be meaningful, you may want to consider which motors are being used for driving. While many use CIM's, some also use FP's and/or the mini-bike CIM (fat chip). Therefore the gear ratios used for those motors should not be compared with other motors.

We used 12:1 Banebots with the DUAL CIM configuration and additional 1.3:1 geardown to the 6" wheels for a total of about 16:1. The results end up with 6.25 ft/s at 40 Amp draw and 9 ft/s at free speed. No shifters last year.

AdamHeard · #5 11-11-2007, 01:17

We had a Small CIM, big CIM and FP w/ AM planetary on each side. The ratio of the Small CIM (which the other motors were matched to) was about 12:1.

This was driving 6 inch wheels.

View Poll Results: What was your final gear ratio on your drive?
< 10:1 (not inclusive)	0	0%
10:1 (inclusive) to 12:1 (not inclusive)	0	0%
12:1 (KOP)	6	37.50%
12:1 (not inclusive) to 15:1 (inclusive)	2	12.50%
> 15:1 (not inclusive)	4	25.00%
Multispeed (Post your gear ratios)	4	25.00%
Voters: 16. You may not vote on this poll

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