Problem getting Nano CPX Inverted

[heli227]

I am trying to learn to hover my Nano inverted. After rotating to inverted position, I do full negative throttle. The Nano stops falling, but it rotates (rudder) around 90-180 degrees, and shoots backwards. Sometimes it pirouettes. So I guess the tail is blowing out...? Is this correct?

I am running in Stunt 2, Throttle curve is 100-100-100-100-100.

Do I need to replace something, like the tail motor? Or is there some other technique?

[nickyd]

Try a v shape throttle curve first with 60% in the middle.
Check for twisty main shaft or boom.
Check battery wiring is ok
If all ok then new tail motor.
, new battery
or even main motor.

Any of above could starve tail motor of power.

[ToddMcF2002]

Brushed motor? If so you are probably bogging with that negative pitch stab effectively starving the tail causing the rotation. Give it a pump of positive pitch before the flip and start transitioning to negative pitch during the flip. That way you avoid "full negative" which is a surefire bog. There is a "coin toss" metaphor people use when flipping the Nano. It is necessary for collective management. The BL kit makes it a bit easier to manage. With the stretch kit flips are even easier still. Keep at it

[heli227]

Originally Posted by ToddMcF2002

Brushed motor? If so you are probably bogging with that negative pitch stab effectively starving the tail causing the rotation. Give it a pump of positive pitch before the flip and start transitioning to negative pitch during the flip. That way you avoid "full negative" which is a surefire bog. There is a "coin toss" metaphor people use when flipping the Nano. It is necessary for collective management. The BL kit makes it a bit easier to manage. With the stretch kit flips are even easier still. Keep at it

Yes, it is a brushed motor. I'll try that technique. Thanks!

[nickyd]

...and make sure pitch is limited to +-85%

[DKHeli]

If you're running the 25c batteries its even easier to starve the tail motor, if you have 45c try those (or buy some, they fly better too). Also if your brushed motor is worn out that will exacerbate the problem.

The other thing to consider no one has mentioned yet is that the tail rotor is notorious for spinning on the tail motor's shaft (ie: if you put a finger on the tail rotor and spun up the main blades the tail motor would spin but the rotor would stay put). If the tail rotor is spinning on the shaft it will normally present as a piro that won't stop until the tail motor spins down quite a bit. If the tail rotor is spinning you can try putting some super glue on the end of the shaft/the rotor... it will probably break the first time you tap anything with the tail rotor but it will give you an idea if that's the problem.

[heli227]

Originally Posted by DKHeli

If you're running the 25c batteries its even easier to starve the tail motor, if you have 45c try those (or buy some, they fly better too). Also if your brushed motor is worn out that will exacerbate the problem.

The other thing to consider no one has mentioned yet is that the tail rotor is notorious for spinning on the tail motor's shaft (ie: if you put a finger on the tail rotor and spun up the main blades the tail motor would spin but the rotor would stay put). If the tail rotor is spinning on the shaft it will normally present as a piro that won't stop until the tail motor spins down quite a bit. If the tail rotor is spinning you can try putting some super glue on the end of the shaft/the rotor... it will probably break the first time you tap anything with the tail rotor but it will give you an idea if that's the problem.

Yes, I am using 25C batteries. OK, I'll take a look at the tail rotor. Thanks!

[JonJet]

You should be using the 45C's to get max power...

The tail blowout is just too much collective...either reduce the pitch servo travel so the blowout disappears, or replace the stock tail with a 7mm extended

I have a dozen...no tail issues even at full collective punch while doing 360 loops

[learnedthehardway]

+1 on the 45c
+1 on the tail rotor
If the tail motor is still pretty new it might take it quite a few flights to get broke in and start holding well.