rva1945

Hi:

When turning, do dual motor drivers just reduce the speed of the inner track or the speed of the outer track is increased at the same time, in order to keep up with the vehicle's speed during the turn?

I'm writing a program for a microcontroller for that purpose (dual motor driver).

Thanks

heavyaslead

Depends on the technology of the electronics, for most tanks each track is driven separately with the one motor reduced voltage or neutral (zero volts) while the other motor turns the tank at speed.

The Tamiya Leopard (DMD/T-07) is the exception where one motor is a dedicated drive and a second dedicated turn motor. The turn motor increases drive side and reduces lag side by equal proportion. This is all done by mechanics (differential transmission) so technically there is no electronic turn algorithm for turning.

Strato50

Clark's, SLU's and Tamiya electronics reduce the inner track voltage in a turn. Flat out everything is at 7.2V (with NiMH / NiCad) and is throttled back.

rva1945

Well, I altered the program and now the outer track speeds up while the inner one slows down, it seems to be more realistic. Very closely as Dimension Engineering's Sabertooth 2x5 RC works.

tomhugill

One other thing is adding a brake to the inner track. I found the rx-18 couldn't do tight turns on grass because the inner track isn't breaked so the resistance of the grass will pull it around.

rva1945

It doesn't happen with my 5 tanks.

tomhugill

This is a few years ago so they may have changed the design. I'm not talking about pivoting with super spin, I mean turns with one track running and the other still! If hl have sorted I that's off to em!