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Blade 450X Blade 450X Helicopters Information and Help


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Old 02-04-2016, 05:56 PM   #1 (permalink)
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Default Occasional Vertical wag

Questions about 450X tail wag are almost universally about horizontal wag. This one isn't.

I have two 450Xs - one a 450XL (Lynxed). The latter has developed a weird phenomenon that when I do a clockwise pirouette (as viewed from above the heli) at the end of the pirouette, occasionally - but fairly often -the heli does a little shudder (a vertical wag - 2-3 cycles, low, but noticeable amplitude).

An anti(counter)-clockwise pirouette doesn't exhibit the same phenomenon. The other heli also doesn't have this issue (so I would think it's unlikely to be any unconscious micro movements on my part).

Obviously, the vertical wag also occurs on other clockwise yaws.

Other than this, the heli seems to behave correctly.

Any ideas? Should I be concerned?

TIA,
Paolo
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Old 02-05-2016, 12:35 AM   #2 (permalink)
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Should be too high cyclic gain.
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Old 02-05-2016, 02:07 AM   #3 (permalink)
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Quote:
Originally Posted by Coco66 View Post
Should be too high cyclic gain.
As far as I know, I haven't altered any gain settings on this heli (since initial setup) over a year ago.

Also, FWIW, apart from changing the tail boom after a crash, I haven't changed any other components in the tail area for months.

But I'll check anyway when I get home.

Grazie,
Paolo
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Old 02-05-2016, 02:49 AM   #4 (permalink)
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I am also surprised when my helis behaviour changes suddenly... it can be the servos are getting tired and don't respond the same way as before.

Just a possibility.
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Old 02-09-2016, 01:02 AM   #5 (permalink)
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Originally Posted by Coco66 View Post
I am also surprised when my helis behaviour changes suddenly... it can be the servos are getting tired and don't respond the same way as before.

Just a possibility.
Ciao Coco,

Is there anything I can do on the bench to check if the servos are tired? They seem to move freely and consistently, as I move the various controls.

In the air, in the main, they seem to perform OK.

Paolo
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Old 02-09-2016, 05:24 PM   #6 (permalink)
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Last fall mine started having a vertical tail wag,its was not noticeable unless i had it in a hover close to me. Then i could see the tail just slightly pitching up and down. Did a bunch of test on the table at home. Moving the servos very fast to see if there was any movement after i centered my control sticks. I could never see anything noticeable. About two or three days later while in a hover coming in to land,just after i switched the idle up off. The bird just slammed into the ground from about ten feet in the air,like i went full negative on the collective. The damage actually was not to bad,skids,tail rotor blades and grips,tail fin. But i did discover what servo was going bad. I know this does not help for trouble shooting much but maybe you might see something i did not doing the same test.
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Old 02-09-2016, 06:45 PM   #7 (permalink)
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Same thing happened to mine right before the elevator servo locked up and smashed the heli into the ground. Take caution, and check that servo for erratic behavior. Best of luck.
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Old 02-09-2016, 07:05 PM   #8 (permalink)
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@BonesR1,

You didn't say which servo went bad (it was only one wasn't it?) Was it the elevator servo - like @NewToRC?

Paolo
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Old 02-09-2016, 07:54 PM   #9 (permalink)
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Oops sorry,yes it was the elevator servo. You might have a different issue,but it's worth checking. I have got to the point,that even if I suspect a bad part I change it. 15-20 bucks and being wrong,is cheaper then rebuilding my 450x.
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Old 02-09-2016, 08:41 PM   #10 (permalink)
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Check the servo itself as others have stated.

But also check your wiring closely. Look for any shorts or stressed areas. Also check connections, one may be working loose.

Check your ball links for slop.

Check your thrust bearings and dampers.

Check your tail blades and tail grips specifically blade tightness and bearings for slop. Check the tail hub for slop or a slight bend. A loose grip can cause vertical bobbing of the tail too.

Main bearings can also cause a bobble like that, but most of the time it will cause a wandering issue.

Not a be all end all, but if you rule out servos, also rule out any mechanical issues that may be causing it.
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