Gear Drive Ratio: 10:4.95/1:11.5:4.95/1:13.6:4.95?

[chopper]

wot does this mean? any help would good thanks

[robgt]

Gear ratios usually describe the ratio between pinion and main gear, and sometimes, they also include the ratio between main gear and tail gear.

eg. 8.5:1 = 8.5 to 1 - the gear ratio of the Trex600 nitro.

So the motor (and therefore the pinion, being attached to the motor) will revolve 8.5 times, for every revolution of the main gear.
Cheers,
Rob

[chopper]

i was lookin at a trex 450 and it said about the gear ratio why would some one need to know that is it o do wih head speed or somethin?

[robgt]

Yes, it will affect the headspeed.
You can work out roughly what headspeed you will get based on a few factors on the Trex450 and running those numbers through a headspeed calculator.

These things need to know KV of the motor being used, the motor efficiency, number of LiPo cells being used and the main and pinion gear tooth counts.

Cheers,
Rob