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HomeAircraftHelicopterAlignOther › Serious glitch with Trex Pro - SOLVED!
02-11-2008 01:50 AM  10 years agoPost 1
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Today after about the 3rd flight, I came in for a landing and there was a serious glitch. It shook the heli like I had quickly bumped the cyclic. Baddraptor witnessed it, and we both agreed it was a 72 MHz PCM hit.

I took it to the bench, and noticed that the boom supports were very loose at the frame. This is metal on CF - a great source for glitching under the vibration of the engine! So I tightened them down and put her back into a hover.

Looked good for a minute in Normal mode, and then looked good for about another 30 seconds in Idle 2, but right before I was about to start flying around, it glitched again! Arghhhhh! Then in 5 seconds it glitched again. It did this a few times and then I hit throttle hold and called it a day.

Sooooooooooooooo, since this isn't a belt (I've had serious glitch issues due to static from a belt in dry weather), where else should I look to solve this stupid glitch issue??? And don't say get a DX7!!!!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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02-11-2008 02:02 AM  10 years agoPost 2
Simmer

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Massachusetts

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Check the antenna wire (continuity form inside the rec to the tip and move the wire while checking) if you have a wire that is. If you do, consider replacing it with a deans antenna. Seems to work really well for me (until I got my x9303)

Check the crystal of the reciever (pull clean the pins if possible) reinsert a few times to get the best connection.

It sounds like it could be triggered by vibration so would make sence to look close at the receiver side not transmitter.

Assuming all batteries were charges in good shape)

If your running the align 2 in one, I would try to figure out a way to isolate that part to eliminate it as the cause. There were issues with the orig, I am pretty sure you have the new version, there is a recent post about one that mis behaved so I would want to eliminate that as a potential issue (swap it out, use a nicad just to test hover in idle up to see if its still there, something like that.

Loose screws (anywhere I guess since the boom suport was loose I would have to look over all the obvious ones anyway, if not all of them.

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02-11-2008 03:07 AM  10 years agoPost 3
mavrick#1

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ON, CAN

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sounds to me like the receiver is the problem, did you have it in a crash lately.
I had this same scenario last summer, it was a filter in the Rx, something like that.

A good day????......... is not crashing :)

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02-11-2008 03:08 AM  10 years agoPost 4
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Woo Hoooo! Solved this one.

Did some wire wiggle tests, and then tapping on the RX, and found out it is Ch1 on the RX. Whatever servo I connect to Ch1 glitches when I shake the wire or tap on the RX. So I need to send it back to Futaba.

Anyway, does anyone know the address for shipping to Futaba for service???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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02-11-2008 03:12 AM  10 years agoPost 5
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Mavrick

I must have been typing my last post when you posted! Yep - it was the RX! Good call!

It's never been in a serious crash though. And it's been running great for months and months...

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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02-11-2008 03:35 AM  10 years agoPost 6
duceduc

rrKey Veteran

Saitama-Ken, Japan

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Futaba service address:

Futaba Service Center
3002 N. Apollo Drive, Suite #1
Champaign, IL 61822

Duc S
Do It! Do It!™
AMA:REVOMIX
RCK:24005615-01

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02-11-2008 07:12 AM  10 years agoPost 7
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Thanks!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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02-11-2008 08:03 AM  10 years agoPost 8
Sam2b

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Tacoma, WA

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Did some wire wiggle tests
Awesome job on finding that nasty problem. I second the wire wiggle tests. It saved my heli from a very nasty crash one time, and just so happened my receiver channel 1 was faulty as well. Spektrum freely replaced it, being able to replicate my problem, and being under warranty.

_Sam B_

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02-11-2008 12:47 PM  10 years agoPost 9
inkspot1967

rrProfessor

Cranston Ri

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hey Rock i thought you got a x9303 now??????

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02-11-2008 02:24 PM  10 years agoPost 10
cbflys

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Nesconset, NY - USA

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This is an interesting post. I put a Futaba FASST 7C in a TRex-450. Intermittently, CH1 servo would jitter. I reseated the servo lead that plugs into the receiver and it seemed to take care of the problem - but, it re-appears 'now and then'. Until now, I thought it was a problematic connector on the servo.

I'll have to look further into this ...

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02-11-2008 05:09 PM  10 years agoPost 11
mavrick#1

rrApprentice

ON, CAN

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good to hear you found the prob.
What Rx is the prob occurring with?
Futaba, JR, what number?

A good day????......... is not crashing :)

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02-11-2008 05:24 PM  10 years agoPost 12
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Yes I ORDERED a 9303. Stupid thing hasn't come in yet!

Plus, It is for Pro #2, I will be running Pro#1 on the 9CHP until I get a second 2.4 RX...

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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02-11-2008 05:27 PM  10 years agoPost 13
inkspot1967

rrProfessor

Cranston Ri

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i would cancel it and get it somewhere else that has it in stock, you told me awhile ago you got one ordered

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02-11-2008 05:32 PM  10 years agoPost 14
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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It's their premier 8 ch PCM RX, the model number is 148.

I started my troubleshooting looking for exposed wires, but everything looked good. Then I started tapping on the RX and wiggling the wires. That's when servo #1 jumped. At first I wanted to blame the servo. But then I swapped leads at the RX, and the twitch followed whichever servo was plugged into ch1.

The one thing I didn't like at all, other than the ch1 issue, was that all the connectors as a whole could move up and down with respect to the RX about .5mm! In other words, as a group they had some "slop" and I could move them up and down while holding the RX. That can't be right!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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