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T-REX 500 › trex 500 rotor head help
02-02-2012 12:10 AM  6 years agoPost 1
courtjones

rrApprentice

florida

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I noticed that I have a slight wobble in the head but it doesn't affect flight, my heli is still super stable and flies still the same, but I am worried about the wobble, its not the main shaft or feathering shaft. Can I straighten out with vice grips or is it $30 down the drain.

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02-02-2012 01:30 PM  6 years agoPost 2
dbldins

rrVeteran

Nicholasville,Ky.

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New or used heli? Bearings in head block may be worn if used.

I wish I still flew!!!

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02-02-2012 02:04 PM  6 years agoPost 3
gftazz

rrVeteran

upstate N.Y. in the Adirondacks

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May just be the main head block itself.
If your talking about a wobble while checking the heli on the bench maybe the head block where it goes on the top of the main shaft isn't tight on it, or it's wallowed out some where the main shaft goes into it from a crash and it may need to be replaced. Since it sounds like you checked the grips and spindle and main shaft already I would check the head block next.

If it's while your flying the heli check the dampners they may be the harder type and you will just need to go up on your headspeed and it will smooth out.

Straighten out what with vice grips??

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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02-03-2012 01:05 PM  6 years agoPost 4
Raj Patel

rrApprentice

Humble, TX

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headblock
I suggest checking the static tracking first... (measure the height of the tip of one blade, rotate the head and make sure the other blade tracks at the same height)... If they do not, check your feathering shaft , main shaft or could be a bad head block.. If the above checks out okay, try replacing the head dampners..

What head speed are you running? A low headspeed could cause that as well...

R. Patel, International Captain, ConocoPhillips

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02-05-2012 03:24 AM  6 years agoPost 5
Scott4991

rrNovice

Westminster, CO

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mine is the same
I posted over on HF that my head moves a bit too. From what I can tell, it has to do with the slits (EFL - is mine) in the head. The bottom goes not grab tight. I slipped some AL foil under each 'slit' area and it helped. I would agree it does not affect flight. I also tried putting the head in aa vise to squeeze the head together - it sprang right back. It's almost like a small hose clamp would tighten it down and not throw off the CG as it's so close to the center - but a small one - I have not looked. I did try a tie wrap - could not get tight enough.. the AL foil worked OK.

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02-05-2012 03:41 AM  6 years agoPost 6
courtjones

rrApprentice

florida

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Yeah I went ahead and ordered a new head block, that small wobble just iritates me. But flight is still stable.

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