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T-REX 450 › Never thought this would happen...
07-11-2008 06:04 PM  9 years agoPost 1
QuantumPSI

rrElite Veteran

Atlanta, GA

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So I've been trying to track down a vibration problem for a LONG TIME now. I even bought a new V2 head and it didn't help. Today, I decided to change the flybar and that helped a little bit. This led me to believe that the issue was in the main rotors. Finally, I decided to try a different set of blades. I normally fly Hyperions and have gone through several sets and never had a problem. But this was all left to do. I have an old pair of align woodies (I hate align blades with a passion) but it's all I have to test. I put them on and expected the vibration to be worse, but to my surprise and dismay, the vibration nearly completely disappeared. I can't get the blades to track properly but when they are as close as possible, the vibration I only noticeable when looking for it. So I'm really surprised right now. My HYPERIONS ARE OUT OF BALANCE!!! I would have never guessed. This is my first pair of carbon blades that have been out of balance. Alright, I'm off to the LHS to buy some new blades. Although these Aligns eliminated my issue, I'm not gonna fly them.

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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07-11-2008 06:49 PM  9 years agoPost 2
QuantumPSI

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Atlanta, GA

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Ok, so I was wrong. I went out to fly and the heli was fine for about 30 seconds. Then I started flying it pretty hard and the vibration came back in full effect. I'm convinced now that it is simply the slop that has built up in my head. I'm going to replace the balls and links and hopefully that'll tighten things back up.

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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07-11-2008 07:02 PM  9 years agoPost 3
garyl

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taxachussetts

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try replacing the rubber dampers in the head.

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07-11-2008 07:09 PM  9 years agoPost 4
QuantumPSI

rrElite Veteran

Atlanta, GA

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Dampeners are brand new, truebloods.

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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07-11-2008 07:18 PM  9 years agoPost 5
michael88997

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Lewisville,Tx

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well if you have enough slop in the balls and links you would be able to feel it by moving the stuff around

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07-11-2008 07:18 PM  9 years agoPost 6
Skarn

rrVeteran

Pasadena, MD

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So am I reading from you that you never balance your carbons before putting them on your heli?

I personally balance all my blades.....yes the carbons (Radix) have been very close, but I've never seen one that didn't need a small amount of tracking tape.....

Man, that vibration issue would drive me crazy. I hope you find out the issue.

Skarn

It's better to burn out than to fade away...

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07-11-2008 08:41 PM  9 years agoPost 7
bilbo

rrVeteran

Boston, MA - USA

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So I'm really surprised right now. My HYPERIONS ARE OUT OF BALANCE!!! I would have never guessed. This is my first pair of carbon blades that have been out of balance.
I've never heard that you're not supposed to need to balance new carbon blades, and most blades I've bought have needed a little tape on one side or another. It's true that the high end blades are usually pretty close out of the pack though, so if they were way off I'd consider that a defect. But if they're just a little off, that's just normal in my experience.

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07-11-2008 08:45 PM  9 years agoPost 8
QuantumPSI

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Atlanta, GA

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To be honest, no I never balance my blades. Just bolt and fly. I'm not too much of a strickler for that unless they are WAY WAY out of balance. Further, I don't have the proper tools to balance trex sized blades (not do I have the patience). Besides, it's Trex, it's my beater machine. Seriously, it just has to be "good enough". But that's just me. As for the slop, yeah, just about everything moves around in the head. I have the original V1 head and everything is pretty loose.

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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07-11-2008 09:30 PM  9 years agoPost 9
bilbo

rrVeteran

Boston, MA - USA

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Further, I don't have the proper tools to balance trex sized blades (not do I have the patience).
That's fine, though I would point out that the only tool you really need is this:

http://www.horizonhobby.com/Product...ProdID=AGNH1004

which costs $5. I just use one of these, plus a spare mainshaft for finding the CG of the blades and getting the CG to be the same on both blades. The whole process takes about 10 minutes at most, usually less, and it's nice to not have the heli vibrating so much.

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