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HomeAircraftHelicopterMain Discussion › Shakes violently
02-02-2010 04:51 PM  8 years agoPost 21
Swoop

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Newark, DE USA

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I don't thinks its been mentioned yet, but make sure the grip bolts aren't too tight. The blades should be able to move in the grips.

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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02-02-2010 06:20 PM  8 years agoPost 22
eppler

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Baytown, TX

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The main shaft looks like it is strait looking at the screw hole when spinning at low speed but called and added one to my order anyway. I am sure the blades are on right but will try to upload picture anyway tonight. The blades could move in the grips and were torque as close as my calibrated hand could get them. Could a high gain setting on my gyro (FUT 520) cause it to want to bounce side to side? I will go down the list of suggestions when I get home and if no improvement I will pull the main shaft and fly bar and roll them on glass to check if they are strait and check head assayable to see if I am +/- any parts. I should get my new parts tomorrow CF main and tail blades, main shaft and fly bar.

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02-02-2010 06:46 PM  8 years agoPost 23
imnxtc

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BC.Canada

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Could a high gain setting on my gyro (FUT 520) cause it to want to bounce side to side?
That is the #1 cause of that phenomenon.

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02-02-2010 06:53 PM  8 years agoPost 24
basmntdweller

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Indianapolis IN

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Imnxtc,
high gyro gain can cause the tail to shake back and forth but not the entire heli. When he ran it without he blades, it didn't shake near as bad so it's highly unlikely to be the gyro.

Matt


Stupid people have no idea how stupid they are!!!

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02-02-2010 07:35 PM  8 years agoPost 25
imnxtc

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BC.Canada

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Without the blades, the gyro would not have to do any work of any consequence, so gyro settings would not be part of the equation.

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02-02-2010 10:37 PM  8 years agoPost 26
Against Gravity

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Pottstown PA

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Heli Max Balancer
I have one and refuse to use it, It never balances the same way twice. Since I purchased a high quality scale, I usualy just double check the statick balance of my blades and hope the CG is close enough. Buying good quality Carbon blades helps to.

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02-02-2010 10:59 PM  8 years agoPost 27
Mike0251

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Hills of the Blue Ridge VA

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Probally to late to chime in here, but, throw them in the trash now! Do not stop by go, just go to the nearest trash can. I put together a brand new Century Hawk Pro, their wood blades are CRAP!! I put a set of Hirobo woodies on it and it was smooth as silk. Buy a good set of blades, quit tormenting yourself and the bird.
ps. sight down the leading and trailing edges, are they warped too? Would not surprise me if they are.

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02-02-2010 11:05 PM  8 years agoPost 28
eppler

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Baytown, TX

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ps. sight down the leading and trailing edges, are they warped too? Would not surprise me if they are.
I bet they are also it looks like dust under the plastic coating.

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02-02-2010 11:30 PM  8 years agoPost 29
oldfart

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Vancouver, Canada

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Probally to late to chime in here, but, throw them in the trash now! Do not stop by go, just go to the nearest trash can. I put together a brand new Century Hawk Pro, their wood blades are CRAP!!
I would not make such a hasty judgement. No manufacturer can make any item perfect each and every time. There will always be the odd item slip through QC that is not up to quality standards. That is why most manufacturers (including Century) will gladly replace such items when they happen.

I have been flying helis for 25 years and have purchased and sold many blades. I have had warped and unbalanced woodies form Hirobo, as well as other manufacturers.

As for Century, we have sold literally thousands of their wood blades and I don't thing we have come across more then a handful of defective ones.

We have also sold wood blades from a number of other manufacturers over the same period and have found that they did not have near as good a record in this area.

Did you try returning them for a replacement?

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02-02-2010 11:57 PM  8 years agoPost 30
Mike0251

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Hills of the Blue Ridge VA

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"Did you try returning them?" LMAO...they would not answer emails or the phone! I got so irritated trying to contact them I searched their IP data and found the email address of the owner and sent an email directly to him as well, again with no response. Did you notice that I said the Hirobo blades were nice? Thats a quality product. The Century blades were crap and I stand by that. Poor covering job, way out of balance, warped, dirt under the plastic covering, overseas made junk blades pure and simple with customer service to go with it. If I sound a bit gruff, its not intended at you by any means. On a scale of 1-10 my Century expierience rates a 0, and I stand by that as well. Never ever again.

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02-03-2010 12:01 AM  8 years agoPost 31
rotormonkey

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Ottawa, ON - Canada

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Come on guys, they're woodies. Now I don't claim to know everything about wood blades, but as a woodworker - wood warps.

There's literally NOTHING you can do about it. The best the manufacturers can do is select wood with a straight grain, and cut along it thereby attempting to control HOW it warps. When it leaves the factory it might be perfectly straight, and balanced.

As the ambient temperature and moisture changes the fibers expand and contract over time. There is absolutely nothing that can be done about it. That's why wood blades are cheap.

If you want absolutely perfect blades that will never change shape - buy them made from artificial materials and pay more. It's as simple as that.

Frankly I think it's pretty awesome that Century or any other company would replace them when they're no longer perfect.

If it can't hover, it ain't worth flying.

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02-03-2010 12:09 AM  8 years agoPost 32
Mike0251

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Hills of the Blue Ridge VA

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Exactly
Clarification - my need to contact them had nothing to do with the blades but a bad part run they issued a warning/return on. The blades I just put on the shelf and never gave a second thought to as the were not useable and I had the Hirobo's on hand.

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02-03-2010 12:15 AM  8 years agoPost 33
Spitfire1

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Perth Australia

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+1 throw the wood blades in the trash, new CF or FG blades and Im willing to bet the problem is gone, if not at least then you can rule out blades and replace simple parts like main shaft, spindle tail shaft which only cost a few bucks anyway.

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02-03-2010 05:06 AM  8 years agoPost 34
eppler

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Baytown, TX

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I got home to late to crank it up but took it apart and checked it out and found my flay bar was slightly bent but the main shaft looked good. I am going to weigh the paddles and fly bar weights tomorrow. I will get my new parts tomorrow and have a three day weekend to get it going.
I tried calling them when I received the kit about the blades and the flat spots on the main shaft and I was told to call back Monday. I called Monday and was told to call Tuesday. Tuesday I was told the techs were busy and would call me back ASAP. That’s been two months ago and ASAP has not come yet. Any way got home to late to crank it up but took it apart and checked it out and found my flay bar was slightly bent but the main shaft looked good. I am going to weigh the paddles and fly bar weights tomorrow. I will get my new parts tomorrow and have a three day weekend to get it going.

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02-03-2010 05:50 AM  8 years agoPost 35
brcg123

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Wagoner OK USA

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are you tightening the blades too tight? If you have them too tight, it will rock back and forth on the skids when you are spooling it up.








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

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02-04-2010 02:56 AM  8 years agoPost 36
eppler

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Baytown, TX

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I got a phone call tonight from a Century rep and after talking to him it is most likely a thrust bearing was not installed correctly. He told me to use the blades without any tape and if I still had problems with them he would send out another set that he would check before sending them out!

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02-04-2010 09:37 PM  8 years agoPost 37
djrformcar

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Las Vegas, Nevada USA

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So was it the thrust bearing? Or are the blades warped.

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02-04-2010 09:57 PM  8 years agoPost 38
eppler

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Baytown, TX

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Not sure about the thrust bearing I had already taken the head apart and did look to see witch ring was installed first. I took the tape off the blades so they are just like I received them and going to try it first thing tonight when I get home. The thrust washers have different center IDs and if the smaller one is put in first it will lockup the blade holder while under load and not allow pitch change and seems it might cause your stabilizer bar to tilt also.

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02-05-2010 01:07 AM  8 years agoPost 39
eppler

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Baytown, TX

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No change so far new blades, fly bar, main shaft checked assembly and at a loss of what is causing this. The blades are tracking good when it happens. Could transmitter settings cause this?

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02-05-2010 02:17 AM  8 years agoPost 40
57NOMAD

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La Palma, Calif.

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Another thing you might want to check is the main bolt that mounts your grips to the spindle, make sure they're in all the way. You may want to check the balance on the tail blades too.


If you're not crashing your not pushing hard enough!
MRC Team Hirobo

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HomeAircraftHelicopterMain Discussion › Shakes violently
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