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Vibration on spin up & down


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AndyRRR
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Joined: 02 Jul 2011
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PostPosted: Sun Jul 31, 2011 12:59 am
PostPost subject: Vibration on spin up & down
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Afternoon, I'm a newbie to this hobby and have followed the advice of a few video's and worked my way up. Started off with a T-34 twin blade job and got bored of that quite soon. Then got a honey bee v2 to practice on a fixed pitch helicopter. Few crashes & builds later my confidence was building.

Now finally I have a belt cp v2. Been pottering around in the garden with it and started to get a bit cocky (I know I should have gone to the park) but clipped the garden fence with the main blades.

Now on spin up, it shakes around really bad. Ok when it gets up to take off rpm. I've check the linkages etc and noting seems to be bent or out of shape. Have I bent something that's not obvious?

Thanks,

Andy T.
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Scott
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PostPosted: Sun Jul 31, 2011 1:10 am
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Welcome Andy,
I am not familiar w/that Bird, but my guess is that You have
bent the feathering shaft/spindle slightly, and/or the main shaft,
provided as You stated, that no damage is visible to the
blades. Either fix should be very cheap, but will require
patience & determination, which most on here will agree
is part of the fun in this hobby. Are parts readily available
for that heli?
Scott
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AndyRRR
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PostPosted: Sun Jul 31, 2011 1:37 am
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Thanks Scott, I've been having a read and looks like it might be the blade tracking. Altho I have noticed that there is quite alot of play in the blades. If you pull the blades gently down you end up with them looking like this ^ and up they look like this V. Without adjusting any linkages, blades look fine.

Is that the feathering shaft?

Thanks in advance.

Andy.
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Scott
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PostPosted: Sun Jul 31, 2011 1:56 am
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The feathering shaft is a straight metal rod that runs perfectly
in line withe the blades & blade grips. Again, I am not familiar
w/Your heli, but regardless, if this shaft is not perfectly straight,
(as new) it will cause balance & tracking problems. If Your heli
is collective-pitch, this shaft will have thrust bearings & washers
etc., that will have to be replaced exactly the same way, when
You replace the shaft. It is a tedious job, but on My heli, the
shafts are 2 for about 6 bucks, so the cost is really not an
issue. It`s more about patience, & parts availabilty.
Bottom line, tho.....If You want to fly R/C helicopters, You
have to be willing to work on them, because You WILL crash.
I have 2 needing repair now, but will most likely wait till winter,
when I can`t be outside.
Scott
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nick_onelove
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Joined: 01 May 2011
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Sun Jul 31, 2011 2:29 am
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You mean that it shakes more on start-up since the crash right? I've got a Belt-CP X and the cheap ESC doesn't start very softly at all, causing pretty severe vibrations until its up to speed.

If it is much worse since the crash though, I would try replacing the feathering shaft and getting the blades in track and then the main shaft if that doesn't work. I'd be pretty surprised if a crash that didn't even damage the blades bent all that aluminum though. Confused
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Scott
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PostPosted: Sun Jul 31, 2011 2:48 am
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Last winter while playing around in the Mancave, (Basement)
I knicked the wall w/My B-400. Virtually NO damage to the
blades, but bent both the feathering shaftr, & the main sharft.
Made a helluva "whack" sound, but no damage was visible.
Carbon-fiber rotor-blades tho. Gonna stick w/wood blades on
the 450 till I get things dialed.
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chopper54
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PostPosted: Sun Jul 31, 2011 3:52 am
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i recently got a new bnf blade 450 and the first few flights had the shakes as i spooled up the same symptoms as yours. i removed and balanced the blades and the problem was cured. you may have done enough to unbalance your blades but i agree its more likely to be the feather shaft.
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laneritc
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Location: georgia

PostPosted: Sun Jul 31, 2011 3:58 am
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Hi Andy lane here I have a belt cp also I agree with Scott bent featuring shaft I get mine from rely helicopters 2 for $5.00 also you need 2 5.5mm nut drivers to replace shaft there,s a link to order them there also lane
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laneritc
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PostPosted: Sun Jul 31, 2011 7:57 pm
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That's suppose to be esky helicopter finger went stupid
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AndyRRR
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PostPosted: Tue Aug 02, 2011 11:21 pm
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Thanks guy's i've ordered some parts, just the wait now........decided to order some more just in case. It did make a hell of a noice. I think the feathering shaft is the culprit.

Cheers,

Andy T.
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pjdog
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PostPosted: Wed Aug 03, 2011 12:05 am
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Have you done q main blade balance?

Jack
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AndyRRR
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PostPosted: Sun Aug 21, 2011 4:09 am
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It was the feathering shaft, it was so bent out of shape I couldn't believe it. One of the gears was out of shape too so decided to replace that and the main shaft also for good measure.

All fine now....... setup and charging.

Off to the park tomorrow Smile
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nick_onelove
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Sun Aug 21, 2011 5:53 am
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Good to hear! Good luck tomorrow!
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