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HelicopterThunder TigerRAPTOR 90 › raptor 60 tail shaking
04-08-2011 01:09 AM  6 years agoPost 1
mglenn310

rrApprentice

Tulsa ok

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so i have a raptor 60 and the tail will shaking up and down in a hover. dose anyone know of this problem or have you seen it in a model before. i would like to know where to start looking to fix this. i have a buddy that tells me its the motor tuning but i don't know so i thought i would check here. any info would be grate. thanks in advance.

FAA # FA3XEYPKAC

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04-08-2011 02:12 AM  6 years agoPost 2
Gary H

rrVeteran

Minnesota ​USA

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Head speed maybe?? To slow.

GH

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04-08-2011 02:48 AM  6 years agoPost 3
Tom Wrobleski

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Wyoming Michigan

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Head dampners may be worn out.

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04-08-2011 02:49 AM  6 years agoPost 4
Brokenlink

rrElite Veteran

Oakdale

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low headspeed, worn dampeners, bent spindle/mainshaft, tracking.Are the mains too tight?Just some ideas.

Jamie Griffith

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04-08-2011 04:37 AM  6 years agoPost 5
mglenn310

rrApprentice

Tulsa ok

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bent spindle/mainshaft would be more of a shaking in the hole heli i thought im new to helis but.... just asking this is only in the tail and its up and down the skids are not shaking at all....

FAA # FA3XEYPKAC

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04-08-2011 12:26 PM  6 years agoPost 6
Gary H

rrVeteran

Minnesota ​USA

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U mention motor tuning, which sounds like head speed to me. I have a Rap 90 has done the same. Also re size all ball links! Is this a new bird, if not, like mentioned dampeners, I also lube them!
My 2 cents

GH

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04-09-2011 07:33 PM  6 years agoPost 7
MartyH

rrProfessor

USA

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Balance the tail blades for starters. That's the most obvious to me since it's shaking up and down. Then get into the head starting simply with headspeed.

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04-13-2011 03:20 AM  6 years agoPost 8
mglenn310

rrApprentice

Tulsa ok

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Thanks guys I will check all that you suggested. But I'm waiting on a new start shaft.then when thats in I will post my findings.. Is there a tool to balance tail blades?

FAA # FA3XEYPKAC

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04-14-2011 03:21 AM  6 years agoPost 9
Tom Wrobleski

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Wyoming Michigan

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To balance tail blades I use to weigh each blade first to make sure both blades weigh the same. Then take a razor blade and clamp it into a vise. Check the balance on one blade and mark it then check the other blade. If both balance from the same distance you are good to go. If not I've used a small piece of tape to get them to balance. Just make sure like main blades you add the same amount of tape to both blades.

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04-14-2011 12:53 PM  6 years agoPost 10
MartyH

rrProfessor

USA

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Had a guy at the field who thought he was helping. I must have had the slightest of an edge sticking up from one of the tail blades. He pulled the tape off and didn't tell me. Next time I spooled up I was trying to understand what had changed as the tail was now shaking. He casually mentioned that I had missed that there was a piece of tape stuck on my tail blades and he pulled it off for me. I politely explained I sort of needed that tape!

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04-15-2011 02:34 PM  6 years agoPost 11
Lee O'Dell

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Gibsonville, North​Carolina

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Usually a vertical vibration shake indicates a head problem, but I have seen a bad tail shaft bearing cause that also.

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04-16-2011 12:15 PM  6 years agoPost 12
mglenn310

rrApprentice

Tulsa ok

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well the motor got tuned and its gone so i guess im good heading to Huntsville....

FAA # FA3XEYPKAC

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04-18-2011 01:11 AM  6 years agoPost 13
MartyH

rrProfessor

USA

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Glad to hear it cleaned up. I was able to make my Raptor 60's tail shake up and down pretty good today too. I was retuning the Thunder Tiger 70 (3 needle regulated OS91 carb) on an MP6 muffler. I chekdd the tail blade balance and even changed the blades just to see how it responded. I had cranked the needles rich as a starting point. Once I leaned it down the vertical shake of the tail went away when the headspeed came up.

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