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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawk Sport BAD Vibration
07-11-2008 06:46 PM  9 years agoPost 1
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Went to the 6mm feathering spindal and ever since Im getting a pretty bad vibration when comin' in for a landing and unloading the head. It lasts for about 5sec. The blades are going nuts. Most likley has to do with the new feathering shaft. I noticed that it is VERY hard to get it thru the dampers (red). In fact as it comes thru the other side the damper pops out and I have to work hard to get it back in. Noticed Century only sells one size for either feathering shaft. Tried differant Fshafts, lubed em up good with triflow, Just cant seem to get it to go away. Comments please.

RIP ROMAN

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07-11-2008 07:03 PM  9 years agoPost 2
Cambo

rrApprentice

Phoenix, Arizona

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Did you change anything in the radio. Sounds kind of like the blade overspeed after it unloads. Otherwise, you can try reaming the dampers out.

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07-11-2008 07:14 PM  9 years agoPost 3
Frank Bostwick

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Cincinnati Ohio

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NOthing eles changed. Did go to the red dampers at the same time. I was considering dresssing the Fshaft till it at least go in to the dampers w/o excessive force.

RIP ROMAN

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08-01-2008 09:21 PM  9 years agoPost 4
mike 58

rrNovice

leesville louisiana ,usa

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did you lube the head & dampers on my hawk if the head speed gets to slow with the red dampers it will shake and wobble are you using woodies

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08-02-2008 12:20 AM  9 years agoPost 5
JohnHawk50

rrApprentice

Chesapeake,VA

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FBoss
Do a test, take the red dampers out and put the black
one's back in and do a test flight.
Check for that vibration,If it still does it, I remember you
said you crash that heli a ways back I think. Check the upper
main bearing for movement. That may cause that kind of vibration
as well. Hope this helps you.

Enjoy the hobby.

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08-02-2008 01:11 AM  9 years agoPost 6
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Thanks fro the effort guys, this thread is a week or so old, Ive worked thru the problems. BTW went to the blacks and it went away. Alos reamed a red set just a tad, no issues. Then lubed the heck outa a red set and all is well. Bad crash since then, sorry to say, she'll be up next week. New servos, better gyro, metal swash, just better than ever.

RIP ROMAN

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08-02-2008 12:14 PM  9 years agoPost 7
Dilbeck

rrElite Veteran

Springdale Arkansas

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If the red dampers are to tight and the feathering shaft is not able to move freely in the head it will not allow the shaft to center up properly.

Clint

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