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HomeAircraftHelicopterHelicopter Main Discussion › Wobble after fyling
10-09-2018 12:37 AM  67 days agoPost 1
jetlag

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Oklahoma,Durant

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Hello, I have an Trex 550e with ikon gyro, When I lift off and hover it is rock solid, after flying 4-5 mins and come in and hover before landing it has a wobble? I have decreased the gyro gain about 10% and it still does it.If I land and then take off again it is fine at first?? Thanks

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10-09-2018 01:15 AM  67 days agoPost 2
nappyroots2182

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Moline, il

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Possible the blades are too loose and when pulling power off they slip.

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10-09-2018 01:17 AM  67 days agoPost 3
jetlag

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Oklahoma,Durant

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Thank you!

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10-10-2018 03:09 PM  65 days agoPost 4
w8qz

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Grand Rapids, MI - USA

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Depending on the dampers in the rotor head, a change in head speed can cause that. Perhaps when your battery pack is getting towards the end of the charge, the rotor head isn't spinning as fast.
Stiff dampers generally go with a high head speed (thus popular with the wild 3D pilots); softer dampers generally go with lower head speed.

"The helicopter is much easier to design than the aeroplane, but is worthless when done."

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10-10-2018 03:39 PM  65 days agoPost 5
jetlag

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Oklahoma,Durant

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Thank you, is there a down side to stiff dampeners?

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10-10-2018 06:10 PM  65 days agoPost 6
Flyin for Jesus

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Troy, IL. 62294

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Flying with a GOV or a V curve throttle?

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10-11-2018 01:41 AM  65 days agoPost 7
jetlag

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Oklahoma,Durant

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Throttle curve. 0 25 60 80 100. I increased the mid stick to 75 and 85 100. I increased the head speed so the tail would hold better,which it does,but it has that wobble now? I fly in normal mode/sport flying only??

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10-11-2018 03:56 AM  65 days agoPost 8
ICUR1-2

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Ottawa, Ontario

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You don't use throttle curves on electric.

Make a flat line and use the governor.

spending time, paying attention

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10-11-2018 03:58 AM  65 days agoPost 9
ICUR1-2

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Ottawa, Ontario

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Stiff dampners requires a high head speed.
Look for the EFL dampners I they're 90's

spending time, paying attention

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10-11-2018 04:04 AM  65 days agoPost 10
ICUR1-2

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Ottawa, Ontario

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The gyro gain will not help you, go through the build once more you missed something .

That's if you built this from a kit.
If it was used. I would change the spindle and all bearings to be sure .

spending time, paying attention

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10-11-2018 04:18 AM  65 days agoPost 11
Flyin for Jesus

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Troy, IL. 62294

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My Goblins do not like low HS, else they did what yours is doing.
Since you said it happenes after flying made me assume you have no GOV and since your pack voltage is lower, you have a lower HS at the end of the flight.
Yoy can either get a GOV and maintain a higher HS, maybe up your pinion size so the ending pack voltage is still enough to keep your HS above the wobble speed.
Goblin people changed out head dampers so fix it so you can try some softer dampers.
That's where you're at. Let us know what you try.

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10-11-2018 05:19 AM  65 days agoPost 12
jetlag

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Oklahoma,Durant

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Thank you! I will start making some changes and see what happens.

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10-11-2018 04:07 PM  64 days agoPost 13
Richardmid1

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Leeds, England

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This simply sounds like you are flying too long or your packs have had it. When your head speed drops due to low voltage the heli will wobble. If your packs are good they probably aren't now!

Change your throttle curve to 0-50-75-80-85-90, recharge your packs, and don't fly for so long. You should be timing your flights and noting how much capacity (mAh) your charger is putting back, if it is putting back more than 80% for the capacity (4000mAh for a 5000mAh pack) then your flying too long. You mentioned 4-5 minutes, your packs should be able to do double that with that throttle curve just hovering around and some gentle forward flight so it's likely your packs have had it.

60% of the time, it works every time!

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10-11-2018 09:05 PM  64 days agoPost 14
jetlag

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Oklahoma,Durant

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That makes sense,Thank you!

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10-12-2018 01:09 AM  64 days agoPost 15
jetlag

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Oklahoma,Durant

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I changed to a higher head speed and it solved all the problems,Im a Harley rider and guess afraid of high rpms! LOL

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10-12-2018 01:41 PM  64 days agoPost 16
Richardmid1

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Leeds, England

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Do you know the motor KV, pinion and main gear tooth count?

60% of the time, it works every time!

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10-12-2018 02:10 PM  64 days agoPost 17
jetlag

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Oklahoma,Durant

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It is as stock out of the box,only thing I changed was to Ikon.Its about 6 years old.Only been flown about 30 times.

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10-12-2018 03:09 PM  63 days agoPost 18
Richardmid1

rrProfessor

Leeds, England

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Sounds like your good to go. Happy flying.

60% of the time, it works every time!

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10-12-2018 04:52 PM  63 days agoPost 19
jetlag

rrNewbie

Oklahoma,Durant

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Thank you! It flys awesome now, rock solid stable and crisp.

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10-13-2018 11:52 AM  63 days agoPost 20
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

"Wobble" on Flybarless after a normal flight... Low rpm or flaps damper too soft or damaged...

Check mechanisms first... If it OK... Change throttle curve to increase rpm on landing side...

/

Saludos cordiales,

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HomeAircraftHelicopterHelicopter Main Discussion › Wobble after fyling
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