Blade CP Tail authority issues PLEASE HELP!

[Ken448]

:arggg:
I have a Blade CP, and have a new issue (to me) The tail will not stop searching. In addition to this, it is near impossible to set the Proportional correct. For the most part, it spins wildly to tail right (high RPM on the tail motor) When I have the gain set anything above 0, it goes nutz.

What I have done:
1. Replaced the tail motor (both motors run exactly the same but seem to be getting some extra RPM's than they have in the past)
2. Changed motor polarity (I knew this wouldnt work LOL)
3. Swapped the 4 in 1 with a brand new one (have an extra on hand)
4. Changed the RX crystal orientation
5. Even used a diffrent set of rotor blades.
6. Tried diffrent battery.
7. Verified blade balance and pitch, and flybar straightness, center.
8. Changed the capacitor on the tail motor.
9. Tried the stock motor with stock pack

I am a bit lost on this, and hope someone can help, or has had this issue before. The only real mods I have done is the 4 in 1 fuse mod(7.5A on the main and 2A on the tail), 370 motor and Li-Po batteries.

Voltage testing on the tail motor reads:

half stick: 40.V
full stick: 5.0V

[zooland1]

My first guess would have been the 4-in-1, but since you changed it that can't be it......unless......your fuse mod has fried the gyro in both of your 4-in-1's. It's a thought. try bypassing the fuse and see if it makes a difference. Might be causing too much resistance or even a glitch. Could also be a problem in the radio. Just stabbing here.

[Ken448]

Tried it.. Made no diffrence. Gyro is working great, it responds nicley to manual inputs (jerking the heli around) it always tries to correct. Thing is, I think the tail is spinning MUCH faster than it has in the past. I dont know what the normal voltage to the motor should be, but mine measured was up to 5V, even more with full right rudder. Could someone verify that for me? As for the radio thing, all controls seem to work fine, but stranger things have happened. Maybe this is going to actually warrant a call to Horizon to see what they can tell me. No one seems to have heard of this before. It is flyable (not much fun) but if I didnt know what I was doing like I did 3 weeks ago, it would be in a pile of parts by now! I had a little pep talk with it, and threatened to throw it into the wifes new paper shreader :P

[wacojoe]

Read the topic on the tail rotor mod. some one had said they cut a inch off the diameter of the tail rotor blades too fix that problem. Iam guessing your running 3 cell li-po.
I have not tried it, but i am only running 2 cell li-po 900mah packs on mine, with stock blades.Rotor speed is slower but still flys great. mine is trimed out, and will hover hands off for a few seconds. flight times average 16-19 minutes.

[Ken448]

yup, I saw that... Weather pending, I will be hacking away at my spare tail to put a band-aid on the issue. Yes, I am running a 3 cell Li-Po, but it is doing the same thing with the stock pack as well. Hopefully, my box of goodies shows from heli direct tomorrow. Have 1 main motor, 2 tail motors and a set of carbon blades ariving. If the blades arrive, and I cant fly, Ill go absolutley nutz!!!

[wacojoe]

yep my stock battery pack did the same thing. installing the 2 cell battery pack tamed it alot. but im not flipping mine inverted. YET!! :)

[zooland1]

What pinion are you using? According to Horizon:
stock pack 10t
2s lipo 11t (I preferred 10)
3s lipo 8 or 9t (I prefer 8)

The smaller the pinion, the lower the headspeed. Hence less work for the tail.

[Rick Rotorhead]

kEN448,
Just to be clear, the cut down tail rotor (I made my stock tail 12cm) would not solve the poor gyro hold on changes in collective/throttle. It was intended to reduce tail thrust throughout the range so that the tail trim would come back into the range of trim correction available on the Tx. A good side effect is less load on the tail motor, which then runs a bit cooler and lasts longer (time will tell!)
Rick

[Ken448]

Well after a looong fight, I finally got it going so I can control it again. The cause: the brand new motor I purchased was defective somehow. Now, with a new E Sky motor, the gain is all the way down (any higher and the tail wags) But everything else is back to normal.

[Gary JP4]

Thats unusual on the Gain. Where is you proportonal set? How does the tail hold?

[Ken448]

propo is set just below 3 o clock. Still holding strong at those settings. Well as strong as a CP will hold LOL