Hi Guys. I have a brushless (E-flite 370 5400) Zero with an apc 10x7, 6.6 box.
It flies great at half throttle and does almost any trick you can think of. But when I go full throttle for a low fast flyby, the thing wants to shoot up. I have to give it down elevator to try an keep it straight.. Is this due to the wing incidence?

Thanks,
Chad

Sounds as though you may want to put a degree or two of down thrust in the motor mount. From the way you describe it elevator trim alone is not going to cure the problem. Gud Flying....Dick

I have had the same problems with my Estarter and a brushless axi 1222-36. I believe that it is the engine torque that is causing it to shoot upward. When I cut power and let it glide it is perfect, no tail sag or anything. When I power up past 1/2 throttle I get lots of climb. I think adding down angle on the motor mount will help but I haven't tried it myself yet. I didn't notice this problem at all with the stock 400 motor.

These two gentlemen are absolutely right. The bad part is that the mount stick is glued in. Remedy this by amking a mental note of the stick angle. Begin by taking a filet knife with the motor/gearbox out and loosening the foam around the stick. Once this is done, pull the stick out and reglue. Shim the top of the stick a bit and give it a couple of degrees of down....it doesn't take much...just enough to make it noticable. Use 5 min. here.
I had the same problem in my Zero too....very common with a brushless power upgrade.
I hope I have helped..
Peace
Vammy

If you have a Computer Transmitter then the solution is simple. Mix about 5-10% of Throttle channel, Ch 3 on my Futaba, into Elevator channel, Ch2. This will automatically feed down elevator as the throttle is increased. Start at 5% and adjust the mix untill the problem is solved. Take care that the mix is such that it does give down elevator. The mix can be either + or- so if the first try is wrong try the oposite.

Ken

Ken,

Cool idea, I'll give that a try tomorrow.