Gear ratio maxed out at 12.7 on a non mikado heli with scorpion

Hey everyone,

New to the forum, hope someone can shed some light on this for me.

I have been trying to switch over some old trex 600’s to Vbar with scorpion tribunus 06-120a esc’s that have a 1650kv motor with an 11t pinion and 170 main gear which works out to 15.45 gear ratio but when i choose a non mikado heli it maxes out at 12.7 ratio.

We did try and fool the system by choosing a mikado heli with a 15.38 ratio to get it close but after saving it and shutting down the system and re booting it, the ratio defaults back to a -10.38 ratio, which shows negative RPM’s!

Any help would be appreciated,

Thank in advance.

The limiot is 12.7 here.

If your gear ratio is more than 12.7 - just use double of your pole count and half of the gear ratio.

regards (EN) / Gruss (DE)

Rainer Vetter

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Thanks Rainer,

looks like this worked, I will go and test fly it this weekend and sky tach it just to see how close it is to the RPM's on the Vcontrol but I think that fixed my issues.

cheers,