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550 Class Electric Helicopters 550 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar. |
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06-17-2017, 04:32 AM | #1 (permalink) |
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Join Date: Oct 2016
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Trying to solve tail wag mystery
I recently rebuilt my Trex 550e and it was flying beautifully. Then I stripped the umbrella gear, I replaced it with a new red align gear and since then my Trex has had awful slow tail wag. I've tried the following..
Using a Microbeast plus. It's got me puzzled, it was flying fine until the gear stripped and was replaced, the umbrella gear is fine though, no chips or wobbles with a nice clean mesh. When it powers down if takes ages for the blades to stop spinning so there appears to be no friction or gear issues. Only think I haven't tried is increasing the headspeed but that would seem unnecessary seen it flew fine before on the same setting. I have a video of it flying I can upload but it just shows the award slow wag (not a violent shake). |
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06-17-2017, 04:34 AM | #2 (permalink) |
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Join Date: Jan 2015
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slow wag can be mechanical binding sometimes.
is the tail silky smooth and not binding at all? ie. does it fall under it's own weight?
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06-17-2017, 07:41 AM | #3 (permalink) |
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Thread Starter
Join Date: Oct 2016
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The tail movement is very smooth, it has no binding but it's not quite loose enough to move with gravity.
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06-17-2017, 12:06 PM | #4 (permalink) |
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Sounds like something may be too loose... check every screw on the entire heli.
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06-21-2017, 03:18 PM | #5 (permalink) |
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Join Date: Jan 2015
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Did you check main and feathering shafts?
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06-22-2017, 07:14 PM | #6 (permalink) |
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+1 and other stuff. You didn't really say what was the result when the tail gear stripped. Did you have any sort of crash?
If you did, any of the rotating parts and/or the boom could be slightly bent. Doesn't take much to cause off-normal behavior.
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This is your brain on helicopters! Trex 700L, Trex 700N DFC HB gasser,Trex 700N V2 HB gasser, Trex 550X. Spirit or BD3SX |
06-23-2017, 09:40 AM | #7 (permalink) | |
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Thread Starter
Join Date: Oct 2016
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Quote:
I originally stripped the main gear and the umbrella gear, all were replaced. It was a crash, new blades, gears throughout, new bearings and even a new canopy. I have a different set of 550 blades that are heavier, might try them. Really running out of ideas. It flys fine but the tail wag really annoys me, might just give up and live with it. |
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06-23-2017, 10:35 AM | #8 (permalink) |
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My theory is that in most crashes, especially if the main blades break, one or more rotating parts are going to get bent. Sometimes it is just a tiny amount. Do the math, if it didn't have this wag before the crash and now it does then something is different and not one of the parts you already changed. Just replace all of these:
Main shaft Feather shaft tail shaft tail rotor hub and grips basically every spinning part Those are not usually terribly expensive. Main shafts can be difficult to see a small bend especially if they have a flange in the middle which makes it hard to do a roll test. If a bend is big enough, you can sometimes see it looking down from the top while it is turning. The feather shaft you have to take out to test so at that point you might as well put in a new one.
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This is your brain on helicopters! Trex 700L, Trex 700N DFC HB gasser,Trex 700N V2 HB gasser, Trex 550X. Spirit or BD3SX |
06-23-2017, 05:22 PM | #9 (permalink) | |
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Join Date: Oct 2016
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Quote:
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06-23-2017, 06:31 PM | #10 (permalink) |
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Please don't neglect the feathering shaft. I didn't see you mention it.
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This is your brain on helicopters! Trex 700L, Trex 700N DFC HB gasser,Trex 700N V2 HB gasser, Trex 550X. Spirit or BD3SX |
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