Fine control of starting motors

[Mike Collins]

Taranis remote control and late model Tiger 1. I'm having trouble starting the tank into motion without it leaping forward (like a Tiger perhaps?). Control of motor speed is OK once its going in general use but the real challenge is driving the Tiger up or down the ramp to the back of my car. Its virtually impossible to make minor adjustments to its direction without causing a big lurch. Yes I have experimented with the "curves" in the remote control but what they can't do is make a difference to the transition from motor stationary to motor driving a track. I hope I've explained the problem well enough. Anyone got any ideas, or do I live with it and just get more skilful with the controls?

Mike

[Stephen White]

Mike, with the Taranis you can set up Exponential stick travel. This alters the relationship between stick movement and speed controllers such that you can reduce the rpm of the motors for the initial stick movements around centre. It has the effect of making the control less sensitive around neutral. Exponential can be found on the stick menus. You'll need to look at the manual or there are lots of good instructional videos on YouTube for setup.

[Adrian Harris]

I would try jacking it up and seeing how it reacts to the transmitter stick positions once the weight is removed from the suspension.

If it's nice and smooth with no load on the motors then you may have some friction within the running gear which the motor is having to overcome before it can start moving.

Adrian.

[Jerry Carducci]

Exponential curve as one of the other posters stated. Also when nothing else will do I lower the maximum proportional 'travel'
of the pertinent channel to something less than 100%. Top speed is lower surely but then I'm not interested in playing bumper cars or destruction derby with my models. Startup is more sedate, usually..

Slow and Majestic!

Jerry

[Mike Collins]

Thats for the advice. The expo function does make control of low speed better. The motors still start with a lurch but it is better than it was.

[Mark Heaps]

The technical term for the problem, this initial resistance to movement which has to be overcome, is stiction.

If as your post seems to suggest, you are okay with it in general use and it is only a problem when loading / unloading it using ramps for the car, my suggestion would be to have 2 different profiles saved on the transmitter, one with max speed at full stick deflection and a second loading / unloading profile set at maybe 1/4 or 1/3 max speed at full stick deflection.

That way once it overcomes the stiction and starts moving, it is not immediately going to a speed you cannot control. Plus you have better control at the lower speed required at the time having the full range of stick deflection.