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HomeAircraftHelicopterFlybarless Rotor Head SystemsV-Bar › Heli is rolling up on left skid at takeoff
03-11-2013 01:26 AM  5 years agoPost 1
Mojave

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Palos Verdes, Ca. USA

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I have a vbar black pro unit V5.1.8 that is acting up in one of my scale machines lately. When the head is up to RPM (1400), I roll into the collective to take off (no cyclic inputs) and just as she lifts the heli is rolling up on the left skid, then she levels off into a hover after lift off. It has never done this before, so I'm thinking that the sensor is starting to go out. It also had an issue where it was tail turning on the ground in a slow circle, like the sensor wasn't sending yaw input to the controller. I rebooted the unit and that went away, but it still lifts the right skid first. It's a right hand rotation head, so if anything, it should want to roll right. Any ideas?
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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03-11-2013 03:36 AM  5 years agoPost 2
Ronald Thomas

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Gainesville, Fl, USA

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Could be a newly induced vibration causing unwanted movements or a sensor going out as well. What does the log say???

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03-11-2013 04:14 AM  5 years agoPost 3
Mojave

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Palos Verdes, Ca. USA

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No, I didn't have my laptop with me at the field and I have never looked at logs in the vbar program, because I have never had any issues. Nothing obvious has changed with the heli. It's smooth as a babies butt, flys great, no vibes etc.. It just started happening out of the blue. Maybe I'll plug it in an try to figure out how to see the logs. I'm assuming it only stores the last flight?
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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03-11-2013 06:24 AM  5 years agoPost 4
BobOD

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New York- USA

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Some fbl systems are pretty sensitive to high frequency vibrations like a spalled bearing. Or any metal to metal rubbing and such. Or noise from a weak connection. It would be pretty disappointing to think a sensor would just go bad for no reason so silly to think that to be the cause.
Do you have your connectors hot glued? Vbars have known issues with loose connections so there's an area to check.
Also, could be something with the tx calibration or something gone off there.
Hopefully the logs will tell us something.

Team POP Secret

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03-11-2013 11:49 AM  5 years agoPost 5
Ronald Thomas

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Gainesville, Fl, USA

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A sensor can go bad, it has happened in the past....to me as a matter of fact. A tx going out of calibration would exhibit those signs but would not level out when in the air, it would have a steady pull.....That is not it for sure.
The VBAR stores all entries so you can see your last flight or any possible problems that led of to this issue arising.

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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03-11-2013 02:36 PM  5 years agoPost 6
doug p

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blaine mn USA

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How old is the mounting tape for the sensor ?

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03-11-2013 04:17 PM  5 years agoPost 7
GetToDaChopper

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Las Vegas , NV

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logs are the way here....

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03-11-2013 04:51 PM  5 years agoPost 8
Mojave

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Palos Verdes, Ca. USA

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Thanks for all of the input. I'll have a look at the logs tonight. The sensor tape has been on there since I built the heli last summer. I have plenty of flights on it and no issues until lately. This vbar has been in 3 of my helis, so it does have some flight time logged. I have heard of sensors failing, so it's not unreasonable to suspect it. My wife is driving up here to visit me this weekend, so I'll have her bring me another sensor to swap. We'll see if this is the cause. Also, yes, all of the vbar leads are hot glued to the case, including the sensor lead. I do this with ALL of my helis.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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03-11-2013 11:32 PM  5 years agoPost 9
BobOD

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New York- USA

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If abused somehow I guess but on a scale ship running 1400 and smooth as a babies butt, I'd hope the sensor didn't just go bad.

Team POP Secret

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03-12-2013 01:17 AM  5 years agoPost 10
doug p

rrApprentice

blaine mn USA

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After two years the mounting tape got hard and my v bar started to actup so i replaced the tape and all is well, some times it is just that simple and cheap.
try it.

Doug P

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03-12-2013 04:20 AM  5 years agoPost 11
Mojave

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Palos Verdes, Ca. USA

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I think I got it figured out, I'll fly it this weekend to verify. The sensor tape was still very pliable, no issues. I looked at the logs and there was no evidence of any vibes that would cause this. Then I looked at the settings... Somehow my head gain had been turned down to 40. No idea how this happened I must have been playing around with it and not realized that I had turned it down so low. This could explain why it was so slow to react to the change in attitude, then leveled out in a hover. The gain gets more critical when the head speed is turned down, as you have a slower reaction time.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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