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Home✈️Aircraft🚁Helicoptere-GauiGaui X7 › SOLVED - Loss of control with cyclic input
06-04-2015 05:16 AM  4 years ago
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BBuilder333

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Dallas, TX

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SOLVED - Loss of control with cyclic input
I'm stumped with this problem. When I give my X7 any moderate cyclic input like starting a flip or roll the main blades slow dramatically resulting a a very brief loss of control. You can hear the main blades take a drastic change in pitch and slow. I have run the Ikon gov and the castle gov. I have also tried 2 different ESCs (CC160 and CC120) and 2 differenct motors both Scorpion 4525. I have also completely reassembled the main rotor head looking for any mistakes. It is tight with no play at all.

After reading the forum I'm thinking the OWB may be slipping. I'm not convinced this is the case becuase it only happens with cyclic input. No problems at all with full positive or negitive collective pitch.

I will try to attach a video. (not great quality)

Watch at YouTube

Any help or advice would be greatly appreciated.
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06-04-2015 04:42 PM  4 years ago
don s

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Chesapeake, VA

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How much cyclic pitch are you pulling?E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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06-04-2015 04:48 PM  4 years ago
BBuilder333

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Dallas, TX

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10 degrees cyclic & 12 on collective pitch.
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06-04-2015 04:51 PM  4 years ago
BBuilder333

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Dallas, TX

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10 on cyclic and 12 on collective.
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06-05-2015 06:49 AM  4 years ago
Daved Gutierrez

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Chicago, IL

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I say one way bearing.
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06-06-2015 03:28 AM  4 years ago
Str8wing

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Las Vegas, NV - USA

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I hear rotor blades stalling on that video. That's the reason for the momentary loss of control. Could be servos not strong enough to hold the pitch you've commanded (and it's pulling more), or you're asking the blades to fly beyond the angle of attack at which they stall. For example, if you're hovering (as in the video) at 6* pitch, and then apply all of that 10* cyclic, you're trying to fly that blade at 16* AOA. I say the blade stalls at about 14*. Of course, there are variables, like the rotor speed you're running. Faster speed might get the flip going such that the blades never actually see AOA beyond the stall, where slower, they just beat the air and quit flying. Something to think about...
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06-06-2015 04:13 AM  4 years ago
BBuilder333

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Dallas, TX

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Blade stall is exactly how I first described the sound and feeling when it first happened. I never thought about the servos potentially being the problem. I will swap out for another set and see what happens. I'm not looking forward to re-wiring the heli but I've got to get to the bottom of this.

Thank for all the help.
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07-08-2015 06:23 PM  4 years ago
BBuilder333

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Dallas, TX

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Solved!! It was a blade stall caused by a servo going bad. It worked fine on the bench but would give out under load. I replaced he servo and all is well. Thanks for the help!
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07-12-2015 10:58 PM  4 years ago
Tyler

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Chicagoland area

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Congrats on solution...
How did you determine which servo was the culprit?
Enjoy things that money can buy IF you don't lose the things money can't buy.
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07-12-2015 11:25 PM  4 years ago
BBuilder333

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Dallas, TX

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Applied downward pressure on each servo at the swashplate. One arm would give when pushed firmly down. The others held firm.
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