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HomeAircraftHelicopterHelicopter Main Discussion › Head dampers
11-03-2018 05:14 AM  11 days agoPost 1
BK479

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usa

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Would dampers that are harder cause a head vibration
I have a KDS 5.5 and I put new dampers and a new farthing spindle in it and the head is shaking .
I put a lot of grease on the dampers and in the head thrust berrings.
I have tried 3 different sets of main blades even a new set .
The fathering spindle is hard to turn but blade grips are smooth turning and no slop . I was just wondering if the spindle is to tight causing the head shaking.
Any thoughts or what else to look for to get rid of this shaking.

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11-03-2018 05:56 AM  11 days agoPost 2
Dr.Ben

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Richmond, VA, USA

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Potential mast bump at lower hs, yes. Vibration, not likely.

Check and make sure the axle is centered in the head block and that the grip and axle assemblies are not shifted from dampers not fully seated. Hard dampers with grips and axle shifted to one side will vibrate like a muther....

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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11-03-2018 09:54 AM  11 days agoPost 3
Flyin for Jesus

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Troy, IL. 62294

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New ( stiff ) dampers with a low HS gives a toilet bowl effect, not a vibration.
Look for something out of balance...

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11-03-2018 11:58 AM  11 days agoPost 4
BK479

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usa

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Thanks guys yes at lower head speed it was doing that toilet bowl effect so I bumped the head speed up and put another set of blades on and you can see the head has a vibe so I tried another set nip and same thing. I thought about trying to put o rings in like the logo has I all ready fitted some in another head block to see if they fit and two on each side and a small shim would probably work and be better for lower head speed I would think . but I need to find the vibe first

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11-04-2018 08:23 PM  10 days agoPost 5
Dr.Ben

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Richmond, VA, USA

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No crashes on the head block?

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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11-04-2018 11:26 PM  10 days agoPost 6
BK479

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usa

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No the head block is new the spindle new dampers new blade grip berrings are new also

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11-05-2018 01:32 AM  9 days agoPost 7
wjvail

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Meridian, Mississippi

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You said you put a lot of grease in the thrust bearings suggesting you had the grips apart. Did you get everything back in the exact correct order? There is only one correct order for everything in a grip.

"Well, Nothing bad can happen now."

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11-05-2018 02:14 AM  9 days agoPost 8
Dr.Ben

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Richmond, VA, USA

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And by the way, do not assume that just because parts are new, esp the head block, that they cannot be mismachined.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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11-05-2018 03:17 AM  9 days agoPost 9
Flyin for Jesus

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Troy, IL. 62294

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Dr.Ben
And by the way, do not assume that just because parts are new, esp the head block, that they cannot be mismachined.
Yep, right here.

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11-05-2018 03:41 AM  9 days agoPost 10
fastflyer20

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N. Tonawanda, NY

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wjvail
Did you get everything back in the exact correct order? There is only one correct order for everything in a grip
Specifically the thrust bearing washers. The large ID goes to the inside and the small ID goes to the outside.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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11-05-2018 10:35 AM  9 days agoPost 11
BK479

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usa

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Yes it is put together correctly I did pull a head off of my friends KDS 5.5 and had no vibe so it could be the head block I could order another one and see if that fixes it

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11-05-2018 10:49 AM  9 days agoPost 12
Flyin for Jesus

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Troy, IL. 62294

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If your friend doesn't mind you taking apart his head, switch your parts over to it one at a time and test, when the vibes start, that's your bad part.

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11-05-2018 10:55 AM  9 days agoPost 13
BK479

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usa

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I could do that.
I also could have a bad machine blade grip but his head on mine it hoverd fine

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11-05-2018 05:05 PM  9 days agoPost 14
Dr.Ben

rrMaster

Richmond, VA, USA

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I smell badly machined parts..... It's a blessing you have another friend's model with which to play swap around.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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11-05-2018 07:16 PM  9 days agoPost 15
BK479

rrApprentice

usa

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Yes it is I gave that one to him

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11-05-2018 07:46 PM  9 days agoPost 16
RM3

rrElite Veteran

Killeen, Texas - USA

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there is one thing you may want to check... the blade grip holes themselves... I experienced this on one heli... the bolt hole was worn and somewhat oval so the blade was not being held consistently by the thru bolt. Ive also seen the bass insert on some blade roots also worn out and allow too much play.

showing a preference will only get you into trouble, 90% of everything is crap...

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11-05-2018 08:07 PM  9 days agoPost 17
Dr.Ben

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Richmond, VA, USA

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Yep. Exactly. A worn grip or a new grip with a misbored drag hole will both cause vibration.

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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11-05-2018 08:37 PM  9 days agoPost 18
BK479

rrApprentice

usa

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The holes look fine they have steal inserts in them but could be drilled off a little I will check with my caliper tonight

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11-14-2018 10:00 AM  14 hours agoPost 19
BK479

rrApprentice

usa

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So I got the vibe fixed it is smooth now but my cyclic feel really sluggish probably need to put new servos in that are faster I guess

I ordered a new head from KDS changed it out and put a new set of KDS 590 blades on it but now it feels slow and sluggish around center with these blades

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11-14-2018 01:47 PM  10 hours agoPost 20
Dr.Ben

rrMaster

Richmond, VA, USA

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What caused the vibration?

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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HomeAircraftHelicopterHelicopter Main Discussion › Head dampers
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