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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Inflight uncommanded (right bank) input to swash
08-07-2012 03:15 PM  6 years agoPost 1
lejon

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Las Vegas, Nevada

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Went to fly my Spectra G this morning and while doing simple figure eights the heli banked 30 to 40 degress right bank. I tried to correct, and I think it did but it look more like a glitch because when I released the left bank input it snapped back to the right. Long story short I hit throttle hold but couldn't get the bird level so it went in on its side and looks like it took out the tail fin, tube, possibly main gear, blades, flybar, spindle and main shaft plus one link broke when the first blade hit.

What I found odd was that when I powered it up everything worked and looked good except there is a 20 to 30 degree tilt to the right in the swash plate. Full left levels it out but if I release the stick it snaps back to the right.

The only thing that comes to mind is if there is something wrong (teeth missing in the gear for the right cyclic) or something wrong with that servo. Any Ideas? I'm at work so it will be later this evening before I get to take a look to see if I can find anything.

Thanks


Lejon

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08-07-2012 03:24 PM  6 years agoPost 2
wrongler

rrProfessor

Brewerton, New York

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Was this the first time this heli has been flown? What electronics are in it? What TX?

Bill Whittaker

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08-07-2012 03:25 PM  6 years agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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Damn Lejon
Sorry to hear that The only explanation I can come up with is that one of the servos went bad on you. Had that happen to me in the past and through some experience I have found that the BLS servos are the most reliable of the bunch.

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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08-07-2012 04:02 PM  6 years agoPost 4
rc3po

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Danville, Illinois

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I had a similar thing happen but it was that the servo horn skipped a tooth on the spline.. I was able to land (ugly) cause I wasn't too high. was freaky on the controls tho.. Anyway, just something to check. I Immediately replaced the horn.

Happay Happay Happay...

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08-07-2012 06:10 PM  6 years agoPost 5
Kos

rrApprentice

Athens, Greece

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I have the exact same issue with a X50fBL with Ace GT5 lately, only difference is that it does not bank that steep, it just seems to be out of trim on the aileron, to the right..i have to correct givin left aileron constantly...at first, i thought it was the GT5, which i did reset, but keeps doin the same...strange thing is, it does not appear from the beginning, it may hover a bit without problems, and when i start fast forward it appears...stranger yet, when i increase the rpms of the rotor, it tilts even more...i havent resolved it yet coz i didnt have any ideas where to begin...could it be the servos/horns???

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08-07-2012 06:47 PM  6 years agoPost 6
lejon

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Las Vegas, Nevada

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Equipment
Wrongler,

8717's on the collective, 9252 on tail with a 601 gyro and a GV1 with stator Gator on throttle and a JR R921 Rx & a JR 9503 Tx. just switched to a life battery from a Nimh.

The machine is on its 4th gallon of gas and has been flying well (albeit a little rich). I usually fly in the am when temps are in the 80's and avoid flying when they are in the 100's here in Vegas.

Had I the presence of mind I might have been able to save it but my brain just couldn't process full left cyclic to keep it level.

Raj,
thanks and I would love to change out the servos for the BLS but that would consume the better part of $400 so not sure when that will happen. Also if a servo goes bad doesn't it stay bad? After the crash they were working fine and later at work I rechecked them and they were working as advertized.

RC3PO,

I'll check the gears and the horn later today. Thanks

Lejon

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08-07-2012 06:49 PM  6 years agoPost 7
lejon

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Las Vegas, Nevada

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Could be horn but
Doesn't sound (to me) like it since I would think that once the horn slips it will either stay in that position or slip again and get progressively worse. To say that it will hover for a bit then start to tilt seems to point away from a horn slipping.

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08-07-2012 07:03 PM  6 years agoPost 8
rbort

rrProfessor

Franklin, MA - USA

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Pot failure
The JR servos can fail in a way where they stop moving in flight and hence why you had to pull left to level the machine. After you jiggle the horn around a bit things start to work again.

You can start the engine and idle it and see if all the servos still work as expected. Also put some load on the servo with your fingers and see if all are the same strength as each other.

You might uncover a problem this way.

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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08-07-2012 07:45 PM  6 years agoPost 9
Kos

rrApprentice

Athens, Greece

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Thanx Raja, m running align servos on both gasser and X50, straight from a 6.6V LiFe...i already had the (new) DS650 (tail) fried on the gasser, which cost me a pretty decent crash...if its a servo issue on X50 as well, it might not be a good idea after all running them on 6.6V...

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08-07-2012 11:19 PM  6 years agoPost 10
torque

rrKey Veteran

bolivia , north carolina

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i just lost my trex 700 helibug the end of last week. i had a align
tail servo burn up in flight. i guess this caused a problem in the electrical system and my heli went into fail safe and in it went.

sometimes you eat the bears and sometimes the bears eat you.

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08-08-2012 04:08 AM  6 years agoPost 11
rbort

rrProfessor

Franklin, MA - USA

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Servo failure
In the close to 5000 flights that I've logged with gassers, I've suffered servo failures many times be it JR, Futaba, Hitec or airtronics that 1/2 the time led to a crash and the other 1/2 was a miraculous save.

Since I started using BLS servos, I've long surpassed the longest lasting servos and those things are still holding up with no issues. I've become a believer in them, yes you pay a little more but less hassle and / or crashes make it so worth it for me.

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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08-08-2012 10:55 AM  6 years agoPost 12
wrongler

rrProfessor

Brewerton, New York

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Any possibility of a lose wire in Rx, a Static hit, frayed wire on servo?
Let us know if you find the problem.

Bill Whittaker

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08-08-2012 12:15 PM  6 years agoPost 13
Ironside

rrApprentice

Baltimore, MD

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I had a similar event happen to me with my Spectra a while back using a AR9000 and it turn out that the the leads of the electrolytic can style capacitor on the base PCB experienced vibration fatigue and failure since it wasn't glued down. After the crash everything worked fine until I opened the AR9000 and saw that the leads of the electrolytic can style capacitor on the base PCB were sporadically making contact. The R921 is basically the exact same receiver so I would open it up and make sure the capacitor is glued down if you intend to reuse it. Check out this bulletin which explains it a little better.

http://www.spektrumrc.com/articles/...?articleID=1709

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08-08-2012 01:40 PM  6 years agoPost 14
Doug Darby

rrVeteran

Dallas, Texas

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Just to be safe...
Don't reuse the servo horn that was on it! It's only a $2 part and not worth the risk that they are slipping.
Unfortunately I know from experience just last Saturday. Mine was the elevator servo.
I tried to land it at the end of its 4th flip and it was not pretty. But she flew again on Monday.

doug

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08-08-2012 02:49 PM  6 years agoPost 15
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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A DS610 elevator servo just died on my T700HB. It was not pretty, with crash costs easily exceeding the price of a good set of servos. She now has a set of BLS451's. The LHS did an out the door price of $300. Tower Hobbies occasionally has some killer coupons that would make them even a little cheaper than what I paid.

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08-08-2012 03:01 PM  6 years agoPost 16
lejon

rrVeteran

Las Vegas, Nevada

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Found the left cyclic servo is bad
Powered up the G and moved the sticks and everything seemed to work fine. I then tried to move each of the servos and all exept the left side cyclic servo stayed locked in position. The left one would move (almost like a slipping rachet) and in any position it would stay as long as there wasn't any resistance. So I think what happed is the gear slipped and the new center position was a right bank (right hand side of the the swash tilted down). Because it would slip under load when I tried to correct it slipped and actually worsened the condition.

Well here come the BLS servos

Thanks

Lejon

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08-08-2012 03:56 PM  6 years agoPost 17
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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Good the hear you found it!

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08-08-2012 08:14 PM  6 years agoPost 18
lejon

rrVeteran

Las Vegas, Nevada

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Thanks
Fastflyer20, I think that had the servo been damaged in the crash there would have been a section with no teeth and once in that spot it would not move under its own power. As I'd indicated I can move it to almost any position and then move the sticks and it moves as if all I had done was change the center position.

Lejon

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