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HomeAircraftHelicopterFlybarless Rotor Head SystemsV-Bar › Strange problem with Raptor 90 V-Bar
04-26-2010 06:08 PM  8 years agoPost 1
Maxime30

rrApprentice

Quebec City, Canada

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I converted a Raptor 90 to FBL, with a slightly modified RJX head and V-Bar electronics.

We tested it last week-end, and it flew beautifully. However, the next day, the heli flew very nice in normal mode, but as soon as we swiched to stunt 1 (higher RPM), then the heli wanted to pitch down, with slow wobbles, and slow tail wags. Nothing has been changed on the helo after the first successful flights.

I'm thinking it might be vibration related, but can't find anything wrong. Any ideas what might cause these problems?

Thank you!

Max

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04-26-2010 09:14 PM  8 years agoPost 2
puma1824

rrVeteran

Maryland, USA

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Are you using banks? When you switch back to normal was is doing the same thing? How do you have your sensor mounted?

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04-26-2010 09:26 PM  8 years agoPost 3
Maxime30

rrApprentice

Quebec City, Canada

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No I don't use banks, I use the aux to control gyro gain. My sensor is mounted just like yours, and I have the extensions to make the arms at 39mm on the RJX head ( you are the one who actually suggested this to me a few months ago )

I lowered the agility, swash gain and cyclic gain, but as soon as RPM increases, in a hover right after take-off, the nose pitches down and wobbles appears.

But it did work awesome for a few flights... Must certainly be something mchanical (vibration). I actually sold this bird to my friend, so I'll have to stop by his home to help troubleshoot....

Thank you!

Max

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04-26-2010 09:33 PM  8 years agoPost 4
puma1824

rrVeteran

Maryland, USA

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I use the aux to control gyro gain
Adjust gyro gain remotely on the Vbar??? OR did you mean to adjust the RPM on the governor?

What headspeed were you running in Normal? If the heli flew fine with that headspeed, maybe use the same headspeed in IDLE1 to test if it's the suspected vibration created with your higher IDLE up.

If taking off in Normal now (after getting the strange behavior) does it still fly ok?

Also just to be safe, I'd copy your first bank to all banks.

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