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HomeAircraftHelicopterHelicopter Main Discussion › Shakes violently
02-02-2010 03:57 AM  8 years agoPost 1
eppler

rrApprentice

Baytown, TX

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I just started my heli for the first time tonight and when the head speed gets up there the heli starts bouncing side to side. I balanced the blades but I think they were too far out of balance. I had to use lead tape to get center balance and three strips of lead tape to balance. Should I try new blades?

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02-02-2010 04:04 AM  8 years agoPost 2
jschenck

rrProfessor

La Vista, NE.

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yes. That much weight sounds like a problem. I've made many unmatched sets fly again by adding tape to balance them but not that much. I'd be concerned about flinging that weight off.

Though I have to wonder if your blades really ended up being balanced. Try just bolting them together and see if they will balance that way. Very simple, it's all I do to balance my blades.

Also did you try spooling up on grass? Sometimes you can get funny resonance on hard pavement which can throw you around. Were the blades on too tight by any chance? Did you check the tail blade balance?

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02-02-2010 04:07 AM  8 years agoPost 3
dkshema

rrMaster

Cedar Rapids, IA

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I had to use lead tape to get center balance and three strips of lead tape to balance. Should I try new blades?
Ya think?

What blades, what heli, sounds as if you got some bargain basement wonders. If you're a newbie and buying woodies, there are still some good quality woodies out there that are pretty close to being spot on out of the box. And most glass or CF blade sets these days rarely require any additional tweaking at all.

Treat yourself to a decent set of blades and worry about flying, not shaking all your heli parts loose.

-----

Out of curiosity, how did you go about "balancing" that set in the first place? Maybe you have a technique problem instead.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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02-02-2010 04:24 AM  8 years agoPost 4
Spitfire1

rrElite Veteran

Perth Australia

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I once attempted to use 2 identical manufacturer blades that came out of different packages, I cant recall the exact weight difference measured on my kitchen scale, but I do know it was barely enough for the scale to read, maybe 1 - 2 grams.

I spooled up to about 1/4 throttle and had to stop as the vibration was so bad, theres no way the heli would of flown (vibration is really an understatement to say the least), I dont think most people realise how tiny the weight difference has to be to make the heli completely unflyable.

Even a really bad set of cheap blades that you have to put ridiculous amounts of tape on to get them to balance, the actual weight of all that tape would be hardly anything.

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02-02-2010 04:32 AM  8 years agoPost 5
eppler

rrApprentice

Baytown, TX

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The heli is a 50nx and the blades are Century SPORT AEROTECH 600mm WOOD MAIN BLADES.I used the heli-max blade balancer for balancing them. It has been six years since I have touched an RC heli.

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02-02-2010 04:41 AM  8 years agoPost 6
Spitfire1

rrElite Veteran

Perth Australia

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You need to get some F/G or C/F blades, there pretty cheap these days(probly not any more than wooddies).

Sure we used to get wood blades to work in the old days, but its just not worth it.

Generally if you buy some fibreglass blades or CF unless your very unlucky they will be balanced enough to fly out of the packet, dont waste your time trying to get those wood blades to fly properly, youl just end up banging your head against a brick wall.

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02-02-2010 04:43 AM  8 years agoPost 7
GREYEAGLE

rrElite Veteran

Flat Land's

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Nothing wrong with woodies to start.
Back to basic's:

Make sure your flybar and paddles are dead nut's centered in the head.
Easy way is to trim off the end of a plastic metric ruler so that one end is a bench mark or witness as (0) and measure your distances they got to be with in a {mm} = mil. On either side.

Take the stuff off { Lead } from the blades and start over. For now just go for a plain ol fashion static balance.

Take your Heli max rig and set it up high like on a jar or a glass, and then take the same rule and measure from tip down to your bench surface.

If you have to adjust balance use a touch of monocoat trim sheet or even shelf contact paper.

Was the bird new ? or ever shake hands with mother earth ?

greyeagle

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02-02-2010 05:04 AM  8 years agoPost 8
eppler

rrApprentice

Baytown, TX

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I don’t think it is the setup. Yes the bird was new and the blades were about 4 grams out of balance and the CG was a quarter inch off. I did not want to start back up with 80 to 100 dollar set of blades to spread over the lawn.

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02-02-2010 05:04 AM  8 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Grey -- you've been at this a long time. The Hi Point balancer is a giveaway, that thing's close to 30 years old...

Bought mine way back before RC helis roamed the earth. It saw many a propeller in its day, and has been doing heli work for a long, long time.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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02-02-2010 05:28 AM  8 years agoPost 10
oldfart

rrProfessor

Vancouver, Canada

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and the blades were about 4 grams out of balance and the CG was a quarter inch off
Well if you balanced them etc. then they should work. As they do not I would suspect something else.

That being said, have you tried spooling them up without the tape etc that you applied to them? Maybe what you have done has put them out.

I say that because I have seen a lot of Aerotech woodies in my time and have never seen any that were that far out. Most were even better then some C.F units I have had in the past.

If they are truely out by that much, then you should not even try to get them balanced etc. I would just return them for replacement.

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02-02-2010 02:03 PM  8 years agoPost 11
BeenHereB4

rrNovice

California

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I would suggest the following.

1. Remove the tape from the blades.
2. Check your blade grips to ensure that you did not leave out any
washers, spacers, dampners or bearings.
3. While you are checking the grips check the spindle to make sure it is straight.
4. Check main shaft to ensure that it is not bent.
5. Check clutch alignment.
6. Finally make sure both blade bolts are secured with equal torque.

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02-02-2010 02:05 PM  8 years agoPost 12
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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Yeah, that seems an aweful lot to be off. And those are quality woodies - not a bargain basement brand. Even if they are balanced, you might want to check tracking.

I've had tracking bad enough to make my heli shake like a british nanny on the ground, but when you lift off it smooths out, but sounds like a weed whacker in the air.

If you've balanced the blades, then they shouldn't cause a shake when you're spooling up no matter how far off they WERE. If they're really far off though, replace them regardless.

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

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02-02-2010 02:36 PM  8 years agoPost 13
eppler

rrApprentice

Baytown, TX

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I pulled the blades and check them again and the CG and static balances are dead on (with a lot of lead tape). I spun it up without the blades on it (I know not the best thing to do) and it was 95% better. I will probably order some CF blades and a new fly bar. The main shaft seems to not wobble till the speed gets up there and starts shaking.

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02-02-2010 02:45 PM  8 years agoPost 14
XxCaTMaNxX

rrApprentice

Navarre, FL - U.S.A.

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Is your flybar balanced? you took the blades off and it was only 95% better? It should have been 100% better. weigh each paddle and make sure the flybar is centered properly.

I told the doctor I broke my leg in two places. He told me to quit going to those places...

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02-02-2010 03:13 PM  8 years agoPost 15
naked painter

rrVeteran

Mid glamorgan uk

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have you got the right headspeed?

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02-02-2010 03:20 PM  8 years agoPost 16
basmntdweller

rrKey Veteran

Indianapolis IN

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If those blades are balanced, you really need to check the assembly of the head. If the blades needs lead tape to balance, get rid of them.


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

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02-02-2010 03:31 PM  8 years agoPost 17
eppler

rrApprentice

Baytown, TX

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I cannot get it up to speed. At one third stick the heli starts bouncing from one skid to the other. I just ordered a set of CF main and tail blades and a new fly bar (I have reason to think it is not strait).

Also I want to thank everyone for your help I have never had this problem setting up a heli before!

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02-02-2010 03:38 PM  8 years agoPost 18
CoronaL

rrKey Veteran

Winnebago IL

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just to confirm, it's not too much gain on your gyro is it?
Hard to troubleshoot w/out being there.

Is mainshaft straight?

Give the new blades a go and see how it works.

Also, I've seen people put blades on backwards. Can you give us a pic of your head/setup?

Randy!!! I am the liquor

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02-02-2010 03:52 PM  8 years agoPost 19
GREYEAGLE

rrElite Veteran

Flat Land's

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Gosh I'm I that Old ??

My High Point never Leaves the bench , nor the extension legs, nor the hand made attachments, nor does it leave the shop It actually set's covered in it's own little tent ! I think It's one of my first investments long before a galaxey, a longlong time ago

Had many good laughs over it too! Especially when comparing domestic props over the new imports as guy's play with my collection. " Long story but their some darn nice import stuff out their !!!! "

Here's a easy to make attachment -even the bolts are crital match weighted- to the point I had to use type writter correction fluid to them.

Hard to believe the gram weight match is that far out, unless they are a mis matched set or something is goofy with the scale.

greyeagle

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02-02-2010 04:29 PM  8 years agoPost 20
imnxtc

rrVeteran

BC.Canada

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Have you tried what a couple of very knowledgable people here have suggested? That is to remove all the tape etc. that you have put on the blades, put them back to the same condition as they were fresh out out of the package, and then tried to spool it up?

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HomeAircraftHelicopterHelicopter Main Discussion › Shakes violently
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