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Blade mCPX › mcpx wobble
04-23-2011 04:09 AM  7 years agoPost 1
TXGrunt

rrNovice

Jersey

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Hello all,

Im not actually a new member... Its been about 7 years since I have been online here at RunRyder and I dont remember my old account. So here we go

I bought the mcpx the other day because I was wanting to get back into the hobby and I was extremely impressed with the performance of this heli. It Performed very well without issue, until I installed the "B" main rotor head. I noticed a difference in pitch immediately. I have to give it more positive pitch about 70-75% more collective just for a stable hover. Another thing is that if I increase pitch and bring it back down quickly (decrease altitude), the helicopter will go into a violent wobble. As soon as I bring it back into a hover, the wobble is gone.

Any advice?

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04-23-2011 04:21 AM  7 years agoPost 2
flyride

rrKey Veteran

Salt Lake City UT

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To fix the wobble check your ball links from the servo to the swash they are probably loose so do the ball link mod use the extra rubber gromets and cut them in half then remove the link then slide them on the ball then put the link back on. As for the pitch I have heard that the new head sometimes doesn't seat all the way down like the old head maybe check that and if it is off just a bit at 0 pitch then you can use collective sub trim to get it where it needs to be and as for full pitch use the atv travel to increase or decrease. Hope this helps.

and the blonde said "RECTUM, Hell damn near killed em!!"

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04-23-2011 12:33 PM  7 years agoPost 3
TXGrunt

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Jersey

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checked the ball links. Their is no play in the ball links.

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04-23-2011 12:37 PM  7 years agoPost 4
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Mine wobbles all of the time. It's a flybarless thing due to an accumulation of slop.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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04-23-2011 12:51 PM  7 years agoPost 5
stryker

rrNovice

Ohio

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mine did the same thing your describing.mine flew perfect till i put the new head on.you need too put the o rings on the swash,all of them have some slop(it is side to side,not up and down slop)what helped mine the most was,i flipped the brass bushings in the head.the dampning is a little to stiff.you want the step in the bushing to go towards the dampners,also put a little lube on the dampners too.

john

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04-23-2011 01:11 PM  7 years agoPost 6
TXGrunt

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Jersey

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flipped the brass bushings in the head.the dampning is a little to stiff.you want the step in the bushing to go towards the dampners,also put a little lube on the dampners too.
I will def. check this out! Thank you

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04-23-2011 02:08 PM  7 years agoPost 7
TXGrunt

rrNovice

Jersey

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"Settling with power"...Afer reading this, I tested the heli doing what the aricle said would induce the phenomenon....One noticeable thing was that in its own downwash, the heli develops the shakes quickly, but flying out of the vortex stops it instantly...Just one more thing that causes the little guy to behave oddly..But it is unknown territory,
This explains what I am experiencing a lot better.

Also, how do I adjust the tracking?

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04-23-2011 05:04 PM  7 years agoPost 8
flyride

rrKey Veteran

Salt Lake City UT

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Settling with power"...Afer reading this, I tested the heli doing what the aricle said would induce the phenomenon....One noticeable thing was that in its own downwash, the heli develops the shakes quickly, but flying out of the vortex stops it instantly...Just one more thing that causes the little guy to behave oddly..But it is unknown territory,
Thats what I thought was my issue until it just got worse and did it all the time until I did the link mod it is free and takes 5 min well worth it. Not saying that is it but if it helps why not.

and the blonde said "RECTUM, Hell damn near killed em!!"

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04-24-2011 03:27 AM  7 years agoPost 9
jrb600n

rrApprentice

East Hampton, NY

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+1 on the tracking. Switched to the weighted blades and still way off.
Tried link adjustments too, but no difference.

Any thoughts?

V-bar
V-bar Control
Oxy 3
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04-24-2011 03:42 PM  7 years agoPost 10
Lowezz

rrApprentice

Canada

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04-24-2011 03:42 PM  7 years agoPost 11
Lowezz

rrApprentice

Canada

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Worked for me!

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04-24-2011 04:07 PM  7 years agoPost 12
jrb600n

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East Hampton, NY

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Did this correct your tracking?

V-bar
V-bar Control
Oxy 3
Logo 480x

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04-24-2011 04:22 PM  7 years agoPost 13
Lowezz

rrApprentice

Canada

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It corrected the random wobble!

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04-24-2011 06:18 PM  7 years agoPost 14
TXGrunt

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Jersey

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So putting tap on the inner most part of the blades will fix the wobble?

Will this fix the tracking? The tracking is still a bit off...

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04-24-2011 09:34 PM  7 years agoPost 15
jrb600n

rrApprentice

East Hampton, NY

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Wow! Thanks FLyride. I did the link mod and no more wobble. Brilliant!
I flipped the brass bushings and lubed the dampers. Even better!
Now it is just the tracking problem. Maybe I will start a new thread if I don't here from anyone.

V-bar
V-bar Control
Oxy 3
Logo 480x

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04-24-2011 09:35 PM  7 years agoPost 16
Lowezz

rrApprentice

Canada

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I just smacked my mcpx this morning inverted. Now I got the wobbles.My only conclusion would be the feathering shaft. Even if you test the shaft and it appears to be straight, try changing the spindle anyways. I'm going to try this. I've never really had any tracking problems to report though!

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04-24-2011 11:14 PM  7 years agoPost 17
jrb600n

rrApprentice

East Hampton, NY

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Yeah. That will happen, but this is an intermittent wobble caused by slop in the ball links and the stabilization system. Most of the time it is smooth as silk and then there is the wobble. If yours starts to do this do the swash mod.

V-bar
V-bar Control
Oxy 3
Logo 480x

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03-13-2012 07:33 AM  6 years agoPost 18
TXGrunt

rrNovice

Jersey

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Still having the issue. I think I may just go to version 2. Here is a video of what my heli is doing.

Watch at YouTube

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03-13-2012 03:31 PM  6 years agoPost 19
pH7

rrKey Veteran

Sterling Heights, MI - USA

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There is a mechanical problem somewhere and the ever increasing wobble is the 3 axis gyro continually over correcting. Check links that might be loose (I assume you have done the grommet mod), feathering shaft, main shaft, main gear alignment on main shaft. Just to touch all bases, rebind. I probably have forgotten several things - Just search for "mCPX" and "wobble" in this forum and you will find many threads on suggestions.

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03-13-2012 05:04 PM  6 years agoPost 20
JKos

rrProfessor

Redondo Beach, CA

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Check your servos carefully, too. Watch them carefully as you very slowly go through the full collective range. Look for jitters, jumps, or drastic non-linearities. If you see anything, try cleaning them. This little guy is very sensitive to servo issues.

- John

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