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11-13-2005 11:00 AM  12 years agoPost 1
justme

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israel

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My heli wobbles pretty hard (not only the tail but the whole heli), When i start to give it throttle, the tail wobbles a bit and then when i apply more throttle it wobbles pretty hard, at about 3/4 stick the whole heli starts to wobble from side to side and then above 1/2 stick the wobble starts to disapear and the heli seems to gain control, since it wobbles so hard i didnt want it to lift off so i dont know how does it behave in hover.
Is this ok for it to wobble at first and the settle down? or is something wrong?

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11-13-2005 12:29 PM  12 years agoPost 2
Kermitdafrog

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Charleston, SC

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Check your blade tracking. Wobble isn't normal or acceptable.

Rick

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11-13-2005 01:03 PM  12 years agoPost 3
turbojoe

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Mesa, Arizona

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It sounds like mine did when trying to use the plastic blades that came with the kit. I couldn't get them to track no matter what I did. I changed to the 315 woodies and it's smooth as silk.


Joe

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11-13-2005 02:23 PM  12 years agoPost 4
justme

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israel

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Thanks, the blaedes were really out of track.
Talking about tracking the blades, here is what i did tell me if i did it right:
I put a red sticker on one of the blades, and spooled it up, Then i saw that the blade with the sticker was lower than the other one, so i stopped the heli and opened the ball link that connects straight to the blade grip, and opened the link a few turns, I guess this should lift the blade a bit, am I right?
Another thing : the heli doesnt wobble any more, but i use a training gear (which i built from two wooden rods in a X pattern) and the ends of the rods shake a bit (but i cant notice any wobble in the heli itself) is this ok?
Thanks.
Assaf.

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11-13-2005 06:58 PM  12 years agoPost 5
Ozydego

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Westerville, Ohio

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Justme, have you balanced your blades as well, as that can cause the shakes that are magnified by training gear. Another thing is a flybar that isn't balanced by exactly the same lengths on either side. The paddles should be screwed in the exact same distance, and the flybar should show exactly the same distance on either side of it.

But Honey, I can't live with just stock.....

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11-13-2005 07:05 PM  12 years agoPost 6
MikeInMobile

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Mobile, Alabama

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Touche Ozydego !

I have noticed that most people don't balance their blades and then wonder why the tracking os off or why the helicopter shakes.

EVERY set of blades MUST be balanced before mounting them on the helicopter. The blades are not balanced at the factory!

An unbalanced set of blades can destroy bearings and main gears, as well as fracture a corbon frame (Yes, I have seen this happen). The vibration created by an unbalanced set of blades can be extreme.

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11-14-2005 12:42 AM  12 years agoPost 7
darrens

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United Kingdom

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Wobble on spool up/down is also caused by a slightly bent main shaft. I learnt this after a very minor ding!!!!!!

He who dies with the most toys is the winner!

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11-14-2005 12:46 AM  12 years agoPost 8
Hammer1

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Duluth, MN

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What is the proper way to balance blades??

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11-14-2005 12:56 AM  12 years agoPost 9
MikeInMobile

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Mobile, Alabama

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First step is to buy a blade balancing tool. This tool is just a calibrated see-saw. These tools are fairly cheap.

Step 1: Determine the Chord-Wise balance of each blade

Place the blade on the balancer so that the blade balances. With a felt-tip marker, mark the balance point of the blade. Repeat this step for the other blade.

Step 2: Check the comparative balance of the blades

Place the blades onto the posts of the balancer. If the balancer is level, and the Chord-Wise balance points of the blades are close (within 2mm), the blades are balanced. If not, use the Chord-Wise balance points to determine where to add tracking tape to the lighter blade. If the Chor-Wise balance poitns are almost the same, the tracking tape should be added to the Chord-Wise balance point. If the Chord-Wise balance point of the lighter blade is further toward the tip of the blade, the tracking tape must be added closer to the blade root, and vice-versus

When completed, the comparative balance should be EXACT, and the Chor-Wise bance points should be within 2mm.

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11-14-2005 01:05 AM  12 years agoPost 10
ppridday

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Detroit Lakes MN

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Hey Mike. Is that new Align balancer going to do the trick? It won't do the chordwise balance but will balance out blade to blade. I have the KS balancer at home but it is one more thing to pack when I go on the road. The little Align unit will fit anywhere.

Cheers,

Paul

"There's someone in my head, but it's not me..."

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11-14-2005 01:25 AM  12 years agoPost 11
Hammer1

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Duluth, MN

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What is a good balancer to get? I now have a trex 450 but am looking into a Raptor 90 as well. Is there a tool that will do both?

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11-14-2005 01:58 AM  12 years agoPost 12
MikeInMobile

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Mobile, Alabama

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If the Align balancer has a central pivit, you can use it to check the Chord-Wise balance on the blades. I haven't seen the Align balancer, but most balancers just have a line in the center to use as the Chord-Wise point when the blade is placed across the balancer. For my micros, I bought a balancer at my LHS that had 2mm posts for the baldes. The balancer didn't have the center marked, so I marked it (easy to do and painless too ) Took me about 10 seconds to mark the center of the balancing platform. I think that mine is a K&S unit, but not sure.

The Chord-Wise balance is not quite as critical as the comparative balance (the Chord-Wise balance affects the Lead-Lag characteristics of the blade while in flight), but whenever possible, both should be checked. I have bought brand new blades that were impossible to balance, and others were in perfect balance ...... I think that it is just a crap-shoot on how good the blades will be. I have, however, found all of my Maverick blade sets to be perfectly balanced when I received them ..... a mark of quality. The Align wood blades have been just the opposite .... I have had to throw away three sets of blades because they were so far out (static weight of the blades was off by 1/2 gram). I guess this shows how good the quality control is at Align.

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11-14-2005 02:04 AM  12 years agoPost 13
ppridday

rrKey Veteran

Detroit Lakes MN

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The new Align balancer is nothing more than a fancy threaded bolt that ties the two blades together to check the comparative balance. Like I said before it won't check chordwise like my K&S but should be good for travel. It's less than 4 bucks too which is a bonus.

Cheers,

Paul

"There's someone in my head, but it's not me..."

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11-14-2005 02:18 AM  12 years agoPost 14
MikeInMobile

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Mobile, Alabama

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Lay each blade on the bolt to find the Chord-Wise balance and mark ..... There is always a way to make it work !

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11-14-2005 02:25 AM  12 years agoPost 15
ppridday

rrKey Veteran

Detroit Lakes MN

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Actually what I have been doing is laying them on a large X-Acto blade in a spring clamp. Can't get a much better balance beam than that. And, you can also cut things and clamp things with it when you're done. Just have to make sure you don't cut the covering on the blades, but I've never had a problem with that. I always save my dumb thumbing for when I fly...


Paul

"There's someone in my head, but it's not me..."

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11-14-2005 02:31 AM  12 years agoPost 16
Ozydego

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Westerville, Ohio

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I use a high point balancer made by DuBro and a custom 4-40 rod and nuts to fit the blade root. You can see in the pics, that I first find the CG of the blades, then I attach a small piece of trim tape to the heavy side (so they look even in the end), then I apply tape to the light blade until the blades balance evenly.... The colored tape at the ends is for tracking... I always match tape on one side with the same amount on the other for tracking, cause even that can cause the blades to unbalance.....


But Honey, I can't live with just stock.....

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11-14-2005 02:33 AM  12 years agoPost 17
Ozydego

rrKey Veteran

Westerville, Ohio

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Here is a great way to find the chord CG, take a spare flybar rod, and lay the blade across it, then just roll the flybar across the surface until it tips and then roll it back an forth until it balances, and mark the blade right where the flybar is, because that is where you apply the balancing tape...

But Honey, I can't live with just stock.....

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11-14-2005 02:41 AM  12 years agoPost 18
TRex888

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Monmouth, UK

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11-14-2005 02:45 AM  12 years agoPost 19
ppridday

rrKey Veteran

Detroit Lakes MN

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Yep. That's basically what the new Align balancer is. Except that they charge 4 bucks and it's blue. I see that being the item that puts me over the top for free shipping some time.


P.

"There's someone in my head, but it's not me..."

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11-14-2005 02:46 AM  12 years agoPost 20
MikeInMobile

rrElite Veteran

Mobile, Alabama

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I kinda like the flybar trick ....... so long as the blade is perpendicular to the flybar, it will be extremely accurate ..... no other tools required. Using a bolt and a high-point balancer will not acheive perfect balance because the high-point balancer does not account for Chord-Wise balance, just comparative balance. If you are really cranking down the blade bolts when flying, the Chord-Wise balance should not be a factor, otherwise, a mis-matched Chord-Wise balance it WILL make a difference in the flight characteristics!

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