RE: 2.4GHz mistery glitch  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> RE: 2.4GHz mistery glitch
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RE: 2.4GHz mistery glitch - 7/19/2008 11:44:23 AM   
Smacka



Posts: 53
Joined: 6/22/2008
From: Weedville, PA, USA
Status: offline 		I appreciate your follow-up. I kept scratching my head wondering what sort of phenomenon is present in his setup...electronics can be a funny animal at times, and there is nothing more frustrating/challenging than the intermittent failure

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Have Great Day!
Smacka

(in reply to Beavis)
       Post #: 26

RE: 2.4GHz mistery glitch - 7/28/2008 2:15:21 AM   
Campgems


 

Posts: 1751
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		Beavis, I think your problem was contagious. I rebuilt the wing on my Ruperts Dad and the maiden flight after was a nightmare. When I got it on the ground, I found that one alieron had slipped the spline on the horn, or at least that is what it looked like. I took it home and straightend things out and back to the field the next day. Another wild and wooly short flight. I had take off in high rates which are way to much. Back home, and rest high rates to something more tame. Fine tune the throws again. Back to the field and I was back to a happy flyer again. Today, the first flight went well. THe second was OK. I tried a couple rolls in high rate and it looked like a ball of wings and tails. Back to low rate and in for a landing. Not bad, so I did a U turn and started my take off again and It went squirly on the ground, but once in the air, it felt sort of OK. a couple loops and back for another landing and this one was dificult, I was all over the place. Calm wind, so I can't blame that. I bounced it a couple times and got it back to the line. Whoa, why is my left aileron drooping. Got it to the bench and both ailerons were drooping in netural. A lot, but they were even. Did I get the aileron servo leads mixed? I swapped them and no change, guess the mechanical is OK. I'm at a loss now as to what is going on. I haven't investigated much, but the aileron Servo arms are Du-bros. I had tighened the horn screws down very tightly after the first apparent slip. Now I'm not sure. I'm going to pull the servos tomorrow and replace them with some new ones, and replace the horns.

I'll keep you informed.

Don

(in reply to Beavis)
       Post #: 27

RE: 2.4GHz mistery glitch - 7/28/2008 9:28:54 PM   
Beavis



Posts: 54
Joined: 10/29/2002
From: Wellesley, MA, USA
Status: offline
Don,

Sorry for your troubles, but thank you for the interesting post... Thankfully, the plane is still in one piece.

During my ordeal I did try tightening the servo arm a lot, but it didn't work. If you are using a Du-Bro arm I would first make sure it is suitable to the servo you are using (not only brand, but also model/size of the servo). If it is, it might be time to toss the Du-Bro...

Best of luck,
Beavis

(in reply to Campgems)
       Post #: 28

RE: 2.4GHz mistery glitch - 7/28/2008 10:35:15 PM   
Campgems


 

Posts: 1751
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		Beavus, I managed to get it down withoug damage. I'll get the servos & arms replace tonight and test it tomorrow. I'm really not convinced it is arms yet, but I had to share the creaping center story with you. I'll keep you posted.

By the way, hows your plane doing now?

Don

(in reply to Beavis)
       Post #: 29

RE: 2.4GHz mistery glitch - 7/28/2008 10:49:17 PM   
Beavis



Posts: 54
Joined: 10/29/2002
From: Wellesley, MA, USA
Status: offline 		Don,

I look forward to learning from your experience also.

My plane is a happy flyer now, behaving well...

Thanks for asking,
Beavis

(in reply to Campgems)
       Post #: 30

RE: 2.4GHz mistery glitch - 7/31/2008 12:31:14 AM   
Campgems


 

Posts: 1751
Joined: 2/18/2006
From: Arroyo Grande, CA, USA
Status: offline 		Well, a little progress, I hope. I got sidetracked yesterday and didn't get to work on the plane. Today I sat it up in the back yard and 'again" centered the ailerons. I then started the servo cycle program on my TX and while they were cycling, I put some stress on each aileron. I wish I had a gram gage, because I could swear that it took a lot less effort to stall out the ailerons compaired to an elevator half. After running the cycling program for about 20 minutes, I stopped and check things out. Both ailerons were off in the same direction by about 2 degrees or so.

I pulled the servo horns and they fit without problems. I can easilly push then to the full down at any position on the splines. We'll rule out a spline issue for now. So, I pulled out two new servos, both with the small wheel that comes on them stock. I noticed that I could not see any of the white output gear spline, but the the aileron servos on the plane, and the DuBro horns, there was about 1/16" or a bit more of the white splines showing. I got the new servos mounted and when I put the horns back on, they also had the 1/16" gap. I checked and the issue seems to be that the spline hub on the horn isn't long enough. It also doesn't fit quite as tight as the stock futaba wheels. I've got to follow up on this one a bit. Anyway, I recentered, both mechanically and with the computer, both ailerons and then put the TX on cycle again. The new servos seem to have a bit more torque. I stalled both servos in each direction a couple times then let the cycle program run for about 30 minutes. When I shut it down, the centers held on both sides. This sounds like progress. I hope to get it tested again in flight tomorrow morning.

When I crashed the plane, it was a glide into the pond behind our field. The wheels were in the water, but the wings were out of the water. They had penetrated some as the lower 1/16" LE sheeting was broken in several places and the D tube had trapped a lot of water. When I got back to the field benches, I cut the covering around the servos and didn't see any indication of watter, and electronics were bone dry. This leads me to think that there isn't any water damage and other than the ailerons, everything else is performing well. If things go well tomorrow and the center trim holds, then I'm going to have to conclude that water did indeed get into the aileron servos. What baffeles me though is why the both end up drifting "down". It seems like if it was a bad pot that there would and uneven loss of position where it seems to be a cooridnated change.

I have to get my spare TX out toniight and get it charged and seup for the plane, I knocked my main TX off the stand and onto the cement patio about mid way through the test this afternoon. It seems to work OK, but it'll get a full range check tomorrow before flying.

Don


< Message edited by Campgems -- 7/31/2008 12:35:55 AM >

(in reply to Beavis)
       Post #: 31

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