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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › tracking with elevator?!!?
04-03-2010 07:35 PM  10 years ago
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helidevil

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Brunswick, ME

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tracking with elevator?!!?
when i am flying and i give like 1/3 stick elevator (back in this case, maybe foward) the blades come un tracked and it makes a huge roar that sounds like the heli's going to explode. then when i release it they are fine, they go back in track.
does anyone have an idea of what this could be/and how to stop it?

im running EDGE 603mm's with some G-Force head upgrades:

http://www.rchover.com/product-p/9901.htm the flybar cage
http://gforceheli.com/c291071_en/c291080/p16857929.html and the mixing arms
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04-03-2010 08:08 PM  10 years ago
LonR

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Macomb,Mi

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Have you checked the bearings in the main grips?That last Oops you had was hard enough to screw the bearings up.The big inner and outter (not the thrust bearings) get sloppy and you can wiggle the inner race pretty good when there bad.A very small hair line crack that would be hard to see in the main grip where the big bearings go will cause tracking issues also.Could try putting the stock head parts back on to see if somthing is bent.Change the arms and if it still does it change the arms...600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan
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04-03-2010 08:23 PM  10 years ago
cudaboy_71

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sacramento, ca, u.s.

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usually when stuff starts going in and out of track on me it's a loose screw in the head backing out. obviously left unchecked it will become very expensive.if it ain't broke, break it.
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04-04-2010 02:16 PM  10 years ago
BarracudaHockey

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Jacksonville FL

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This might be a stupid question but what helicopter we talking about?Andy
AMA 77227
http://www.jaxrc.com
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04-04-2010 03:01 PM  10 years ago
Chief_USN

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Chesapeake, VA

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Had this happen on my Caliber 30 and it ended up being play in the washout base. Put a new metal one on and it went away. If you don't know, the washout base is where the rotation pins from the head go into. I had an EVO 50 that would do it also. Went right to the head and looked at the washout, nope, this time it was the blades. They looked fine, were balanced and didn't have any imperfection on them, until I did a closer look. One blade had a 1/8 - 3/16" hole in the leading edge. It didn't go all the way through, but was deep enough I guess to grab air and cause it to flutter out of track. Put a new set of blades on and viola, flutter was gone.

Some other things to check is slop in the servos, the linkages from the servos, and as said before, screws and nuts in the head assembly. Hope you find it. We don't need another heli to fall victim to the "Woof and Poof".

Chad
Team HeliProz 12-14
US Navy Chiefs...Unity, Service, & Navigation to the Fleet since 1893
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04-04-2010 03:27 PM  10 years ago
helidevil

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Brunswick, ME

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its a raptor 50 V2, or a crapy rappy (hehe )
i did find one screw backed out 3/4 of a turn on the mixing arms so i re-locktited it and snugged it back up and it cured half of it. it didnt "woof" as much but still heard a little here and there.

the grips look fine to me and ive been flying with a little slop in the washout for .....ever i guess. no holes in the blades lol
ill have to do one more final run down of the entire head.

thanks amillion guy's
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04-04-2010 04:33 PM  10 years ago
JasonJ

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North Idaho

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Flip the grips and be done with it. Make sure your dampeners are in good shape, everything is tight, no loose links, servos in good shape. The thing with Raptors is they are trailing edge controlled. That means any deflection in the feathering shaft (bad dampeners) causes increased delta, which basically means that once the blades go out of track the problem gets worse (blade flutter). If you go to leading edge control, flutter decreases or is eliminated because deflection of the feathering shaft decreases delta, creating a self correcting situation.

Some will say you shouldn't have to flip the grips to resolve flutter on a Raptor, I say BS. There is a reason the new SE went to leading edge control. It's easy, it's free, and it works.
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04-04-2010 05:07 PM  10 years ago
Zaneman007

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Texas - USA

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I had ball come unscrewed on the main blade grip while I was in a hover. It made a horrible sound. I managed to auto it down. You do not want that to happen.

IMO: ground the heli and go over the entire head, make sure all the screws are tight, and check for slop. Then work through all of the linkages and servos.

Also, turn the heli "ON" and make sure that the servos are holding, just grab them and try to turn them by hand. I have seen servos that will hold in one direction but not the other.

Good luck with that.
Old Guys Rule!
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04-04-2010 05:22 PM  10 years ago
BarracudaHockey

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Jacksonville FL

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Flipping the grips may keep it from happening but it's not going to fix it. If you have blade woof something is wrong, it would behove you to fix it.Andy
AMA 77227
http://www.jaxrc.com
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04-04-2010 05:36 PM  10 years ago
helidevil

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Brunswick, ME

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but its only for a seccond.....and dont say behove again! my writing teacher says it all the time and i hate her to death!
until my 8717's get in im running a JR DS811 and ST47's so not much i can do there for now. and flipping the grips will alter a l;ot of things. the mixing arms are angeled so i would have to change all the links and stuf. so for me thats out of the question
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04-04-2010 11:53 PM  10 years ago
Yug

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UK. Herts

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Your problem is blade flutter. By the sounds of things you have some play somewhere in the system, which can be anything from nackered bearings to loose fitting pushrods, to soft servo horns or even warn servo gears. This problem is exemplified on heads with negative delta which has the effect of loading the control drive system in either it's normal offset condition or it's worst case condition. The method of servo mounting can also aggrivate the problem which can often be fixed by using pivot supports.Vegetable rights and Peace
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04-05-2010 01:49 AM  10 years ago
JasonJ

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North Idaho

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flipping the grips will alter a l;ot of things. the mixing arms are angeled so i would have to change all the links and stuf. so for me thats out of the question
There is no reason why you can't do it beyond just needing to do some work. All you are doing is setting up your seesaw/mixing arms in a mirror image of what it was, flipping the grips, and reversing your pitch servo. Since you need to go through the head and make sure everything is tight and in good shape, you might as well go the next step. I don't get the resistance to grip flipping. It isn't violating federal law by doing it. It is an additional thing to do that WILL prevent a woof & poof.

Again, Thunder Tiger didn't change over to leading edge control because they were bored. Yes, a Raptor can be made woof free with trailing edge control, but there is no rational reason to stay with a control configuration that is so overly sensitive to head issues. A woof & poof is dangerous and can cause a crash. Anything that can be done to avoid it should be done, not dismissed because "That's not how we did it". It's called progress, stays crunchy even in milk...
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04-06-2010 03:36 AM  10 years ago
helidevil

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Brunswick, ME

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i might do that while i have time this weekend, or look into a full SE head
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