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HelicopterMain Discussion › Just how tight is yours?
07-12-2008 02:01 AM  9 years agoPost 1
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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I made a few changes last time around and now have a problem. HawkSport, 6mm fethering shaft, Thrust bearings and Red dampers added. Since then under some conditions, my blades begin to flutter up and down, looks like they are way out of track. Lasts from 5 sec to 30sec and I can settle it by giving it some Up collective. T.bearings installed right as well as the other parts. Heres what I think may be it. Getting the feathering shaft thru the installed dampers (in the head block) is very hard, dampers are lubed with triflow but it still requires ALOT of force to get it thru. Even then the damper on the opposing side pops out and I have to push it back in. So how tight should that be? Id say snug but able to slid thru with very minimal force but I dont KNOW thats why Im asking!

RIP ROMAN

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07-12-2008 02:18 AM  9 years agoPost 2
David Blain

rrKey Veteran

Mt. Dora, Florida​(USA)

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FBOSS--
Welcome to the "Woof and Poof" !
IF your sure the head is 100% then work from there back thru the linkages and pivot points etc. Ending at the servos connection screws that anchor them.
Now you will be asked, what blades your flying and RPM's....
Good luck buddy, I chased one down on the Raptor Titan 50 and it was in the servo screws that anchor them to the frame... plus I found a bent screw on the blade grips...
LOOK for Anything... that may induce the "woof" before the flutter gets bad enough for you to lose the helo....

Pull-n-Pitch

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07-12-2008 02:37 AM  9 years agoPost 3
Gas and Go

rrApprentice

Western Wisconsin-​USA

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would lube up the dampners and feathering shaft with Di-electric silicon. This is what recommended in my manual. I had used just some teflon bicycle grease for the first 1 year and a half, and would have the same problem re-occuring. After I started using the di-electric silicon problem went away. So if you havent crashed- so nothings bent I would relube, and make sure you run enough head speed, on my R-30 with red dampners you should be 1900 rpm much bellow 1700 and my heli bobs in a hover.

you can get di-electric grease at auto parts store, its commonly used as bulb grease for a cars tail lights.

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07-12-2008 02:39 AM  9 years agoPost 4
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Bingo tha may be it. Im running at last tach right at 1800. How tight is the feathering shaft in the head/dampers? How hard to push thru?

RIP ROMAN

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07-12-2008 03:11 AM  9 years agoPost 5
Gas and Go

rrApprentice

Western Wisconsin-​USA

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when I was using the teflon bike grease it was fairly stiff to push thru, but when I tried the di-electric silicon it slid thru a lot easier, its like the di-electrid silicon stick to the rubber of the dampner better.

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07-12-2008 07:26 AM  9 years agoPost 6
oldfart

rrProfessor

Vancouver, Canada

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What blades?

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07-12-2008 11:01 AM  9 years agoPost 7
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Just a set of woodies at least till this is cleared up.

RIP ROMAN

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07-12-2008 02:12 PM  9 years agoPost 8
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Changed back to the black dampers and no more flutter. Cant even make it flutter. How safe is light inverted stuff (hovering, flips, rolls, IFF) with the soft dampers?

RIP ROMAN

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07-12-2008 02:18 PM  9 years agoPost 9
Dave M

rrApprentice

Mi.

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Alot safer than having the blades woofing at ya..

I will second the use of silicon grease.

It's OK....It's not your fault !!!

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07-12-2008 03:28 PM  9 years agoPost 10
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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The black dampers are alot safer than my dumb thumbs!!,
Just now nosed it in hard. Pure dumbthumbs inverted. That was the hardest Ive ever crashed. Nose straight in at high speed and high energy! Bits are everwhere. Hello, is this the parts department?

RIP ROMAN

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07-12-2008 03:33 PM  9 years agoPost 11
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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RIP ROMAN

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07-12-2008 05:10 PM  9 years agoPost 12
Dilbeck

rrElite Veteran

Springdale Arkansas

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Sorry to here about the crash. I found those red dampers to be just a little to tight! So I drilled them out ever so slightly so that the feathering shaft would go in tight and slide back and forth with some grease, they have performed wonderful ever since. I sometimes get the felling that the red dampers were designed to fit both sizes of feathering shafts and for the 6mm size need to be drilled out just a little. If the feathering shaft is not allowed to move under load it will not center its self properly on spool up.

Clint

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