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09-10-2006 10:18 PM  14 years ago
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yamahajoe

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ROGERS , AR 72758

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TAIL VIBES IN SWIFT
please help. i have a swift with neu 1907 1.5y running on 6s2p align battery and 401 gyro. i have the new solid shaft and new tail shaft blades are balanced. i have a lot of vibration in the tail. it does not effect the tail holding but i know this in not good. what should i try. thanks joe
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09-10-2006 11:22 PM  14 years ago
A&P Mech

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The Mile High City

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I hear the vibe!
Yamahajoe,

I was working on my swift today and I notice the tail rotor was loose on the drive shaft. The set screw that holds the tail rotor main hub on to the tail rotor drive shaft was very loose. I am very lucky the tail rotor didn't depart the heli. I thought I had loctited the set screw when I put the heli together but I must have missed it I don't know if this is what is causing the vibration but try checking that set screw. One other thing to check is, how tight are you running your tail blades? I run mine just tight enough to keep them from dropping down when that blades are placed horizontal. I have found that tight tail blades equal tail vibration. What type of yamaha do you ride? I have an FZ1 and love it!
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09-10-2006 11:52 PM  14 years ago
yamahajoe

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ROGERS , AR 72758

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i am the sales manager at bill eddy's motorsports in rogers ar so i get to ride anything i want. but my favorite is the road star warrior. thanks for the input i will check those things.
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09-11-2006 12:23 AM  14 years ago
yamahajoe

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ROGERS , AR 72758

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my set screw was tight and i loosened the tail blades but still the same problem. more help please
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09-11-2006 01:14 AM  14 years ago
rcmarty

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Penticton , B.C. CANADA

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Don't quote me on this , it's from memory.

In the raptor forum when you ask about the tail vibrating the first thing everyone asks is it up and down or are the tail fins buzzing.

I beleive it all leads back to the mainshaft and spindle.

If you have the hollow main shaft and had even 1 shakedown on spooldown i'm going to say it's the mainshaft. I bent a new mainshaft on one spooldown Straightened it by hand .

I look at the top hole in the headbloc on spool down to see.

Another note : I put one wrap of a post it stickie on my tailcase before putting it back in to tighten it up alot. Also the bolt that holds it all togeather isn't long enough to get into the lockwasher part. Locktite it , i used the tamiya plastic loctite .

Martin
What goes up will come down.... one way or another !
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09-11-2006 01:21 AM  14 years ago
yamahajoe

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ROGERS , AR 72758

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main shaft is new and it is up and down vibes.
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09-11-2006 03:39 AM  14 years ago
NTM

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Lloydminster, Alberta, Canada

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Check for binding in the tail grips, the bearings specifically.
Also check the tightness of the tail grip to hub bolts and the straightness of the bolts.
I had the same thing, it was a slightly bent tail grip to hub bolt.
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09-11-2006 04:11 AM  14 years ago
wakeboarder2342

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USA

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I had the same problem and it was corrected by loosening just a touch the collar on the main shaft. mine was really tight and had zero play when lifting on the head. after i loosened this just a touch it eliminated all of my vibe problems. I had tried everything before this, new head, new shafts new blades EVERYTHING and this is what fixed it


give it a try
favorite quote, no honey thats the same helicoptor i have always had
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09-11-2006 03:21 PM  14 years ago
yamahajoe

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ROGERS , AR 72758

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thanks wakeboarder that did it.
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09-11-2006 06:35 PM  14 years ago
wedge

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Victoria BC, Canada

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Another thing to check, I had a T/R hub that was drilled incorrectly, the blade grip bolt was going in on a angle causing a vibe.Victoria BC, Canada, Century Swift,Trex SA 450, Hummingbird V3.
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09-13-2006 06:41 PM  14 years ago
ratedh

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Florida

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had the same problem and it was corrected by loosening just a touch the collar on the main shaft. mine was really tight and had zero play when lifting on the head. after i loosened this just a touch it eliminated all of my vibe problems. I had tried everything before this, new head, new shafts new blades EVERYTHING and this is what fixed it


give it a try

favorite quote, no honey thats the same helicoptor i have always had
Wake,

Are you saying that you loosened up the upper collar shaft to give the main shaft some play. So if you lift up on the main shaft it will move up and down slightly ?


Thanks
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09-13-2006 09:38 PM  14 years ago
Tom Viper

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SWEDEN

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That might be true.
I was flying my swift for 6-7 times, with no vibes, then after checking it thrue I found that there was some play in the shaft (up/down) so I tightend the shaft collar, and today I got some really bad shakes! Nothing else where done to it. I am now going to try to back it off slightly and see if it helps.
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09-13-2006 09:49 PM  14 years ago
Wheelhaus

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Denver

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I think he means that the bearings arent preloaded anymore. (if you pul up really firmly before you tichten the upper collar, the pearings have a load on them when the collar is tightened.) if you only pull up enough to eliminate slop you can still tighten the collar without loading the bearings.

I had an up/down vibe/wiggle after making some adjustments to the head, but the cause was that my main blades were about .1" out of track. if it's more of a up/down oscillation/wiggle/shake whatever, it's 99% the head or main shaft that is the problem. If it's a high frequency buzzing type of vibration, then look to the tail. Whatever is out of balance or out of track will oscillate at it's rotating frequency.
..........
Dave
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09-14-2006 01:29 AM  14 years ago
rcmarty

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Penticton , B.C. CANADA

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I noticed how the collar can make a huge differnce during the build up.

I noticed the head wouldn't spin freely when i checked the top collar for locktite. Did the locktite and spun it again to check it, didn't spin very good anymore.

I ended up adjusting all 3 of the screws togeather, a little on one then the other and the last one. Repeat a few times.
This get the collar far more level to the bearing than gripping down on one then the others later.

I guess it's one of those things to look for. Give the head a spin and watch the collar to see, if it's out it will be obvious.

didn't get to the tail vibes part as i caught it early. If i do get vibes after a crash i'll be sure to check

Thanks for the tips

MArtin
What goes up will come down.... one way or another !
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09-15-2006 07:56 PM  14 years ago
JoeB1

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Ireland, Wicklow

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I have had the same prob with my Swift and its has been rattling my brain.
I tried this and low and behold it solved it! I done axactly what rcmarty said.
Bear in mind I have balanced everything, changed blades all round etc and I cant beleive this was it! Now I can turn the giro up a bit more!

THanks Guys...............
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09-17-2006 12:10 AM  14 years ago
wakeboarder2342

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USA

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ya it was really buggin me before i figured this out!

i deserve a medal for solving the mystery shakes!!!


glad u got it worked out
favorite quote, no honey thats the same helicoptor i have always had
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09-17-2006 01:53 PM  14 years ago
JoeB1

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Ireland, Wicklow

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wakeboarder2342
I like your quote.
Made me think about the V2 Shogun I have. You see it started out as a V1 shogun with a Airwolf body but it got a radio gitch and went full speed to the ceiling. As far as I am concerned the V2 I have is the same heli that was in the Wolf!
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