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HelicopterThunder TigerOther › Rap 60 tail vibration --- still...
01-15-2003 03:10 AM  15 years agoPost 1
Bill Ludwig

rrVeteran

Tucson, AZ

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Hi all,

I'm getting tail vibrations at 1450 rpm. When I switch to idle-up 2 at 1750 it goes away and smooths up real nice. I've run both the stock dampers and Rick's o-ring upgrade. Same problem. I'm pretty convinced it's a head dampning issue as everything is new and straight on this heli. The head is well greased.

On the other hand, I can run my Fury all the way down to 1200 rpm and still not get a bit of vibration like on the Raptor.

Anyone else having this problem?

Thanks,

- Bill Ludwig

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01-15-2003 05:30 AM  15 years agoPost 2
Clay Schmidt

rrNovice

Pawnee Rock, Kansas USA

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Head Block

Bill,

You could have some run out in the head block .

Clay

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01-15-2003 06:04 AM  15 years agoPost 3
Bill Ludwig

rrVeteran

Tucson, AZ

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I have put on two new head blocks on it, along with new blade grips. Basically everything that moves has been replaced with new. I'm beginning to think it's normal for the Rap 60...

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01-15-2003 06:10 AM  15 years agoPost 4
VKGT

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Sanford, NC

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Just out of curiosity, what gyro do you have? Are you 100% sure that the vibes are from the mechanics?

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01-15-2003 06:55 AM  15 years agoPost 5
Bill Ludwig

rrVeteran

Tucson, AZ

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I'm running the JR 5000T gyro. I failed to mention, it's not a tail 'wag', it's a vertical vibration and canopy shake. Remember, it's only at the lower (1450) head speed...

- Bill

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01-15-2003 07:35 AM  15 years agoPost 6
Twobeers

rrKey Veteran

Toronto, Canada

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Try an enya 3 plug.

I lost my infamous tag line.

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01-15-2003 05:21 PM  15 years agoPost 7
Clay Schmidt

rrNovice

Pawnee Rock, Kansas USA

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Vibes

Bill,

Still could be a head block if you are using the plastic one.

But canopy vibes are usually engine related. Mixture, fuel, plugs,exhaust system, compression?

Just a side note, sometimes crankshafts are less than straight. Some are bent and I've seen others that were ground off center. I just went through a bgx and it's prop shaft was ground .002 off center.

Just food for thought.

Clay

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01-15-2003 06:04 PM  15 years agoPost 8
Bill Ludwig

rrVeteran

Tucson, AZ

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Good thoughts, Clay, but regarding the head block, I'm now using one that Alan Szabo had on his machine - blade grips and all - he had no vibes with it. I've also run two different TT .70 engines - same problem. I've been flying helis for six years and tuning is not a problem for me. This is the only one that I've even owned that has the shakes that I can't figure out.

- Bill

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01-15-2003 06:23 PM  15 years agoPost 9
Heli-Driver

rrElite Veteran

Arlington, TX

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Bill,

For some reason the Raptor 60 doesn't like a low headspeed. At 1450 it will usually wobble or shake the tail.

Try raising your headspeed to 1550.



Raymond

Predator Gasser SE/231 X 2
Century Helicopters

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01-15-2003 09:24 PM  15 years agoPost 10
Clay Schmidt

rrNovice

Pawnee Rock, Kansas USA

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OS

Bill,

Can you get your hands on a OS and see if that makes any difference?

Clay

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01-15-2003 10:04 PM  15 years agoPost 11
rockcrawler

rrVeteran

Covington Wa

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The problem sounds like your headspeed.
My r80 does the same thing at that speed. The only reason I know
is that I hit that rpm ONLY during break in. There is no reason to run
below 1600 unless its electric.

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01-15-2003 11:09 PM  15 years agoPost 12
psawya

rrKey Veteran

Woodinville, WA

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I had a very distinct wobble at low headspeed on my Raptor 80. During break only while running rich. After I leaned out the hover needle and upped the headspeed there is no more wobble.

Pete

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01-16-2003 02:02 PM  15 years agoPost 13
RossoOz

rrNovice

Oz

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I also ran into this problem recently, I'm using my raptor 60 mech to build a scale 222. On my test flight of the 222, i got bad tail vibe's in the vertical plane, which almost disappeared once the head rpm was around 1600.
Anyway, after lots of stuffing about checking things, I put the head assembley on the prop balance with the main blades fitted, turns out that my "Matched and Balanced Blades" were slightly out as a set.
Bit of tape added to the light blade, and the test flight was a smooth as silk all the way thru the rpm range
This may be your problem, just try some different baldes maybe.
Thanks to someone on the forum who helped me at the time, the advice was quite simple, if it rotates, check it and balance it.

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HelicopterThunder TigerOther › Rap 60 tail vibration --- still...
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