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HomeRC & PowerAircraftHelicopterRadio - Mikado VBAR Control System › Strange behaviour.. Silver V-Bar and V-Control
09-20-2017 01:31 PM  14 months agoPost 21
Anton123

rrApprentice

Canada

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Hello again,

I am truly stumped.. I have tried everything from a new setup to using another radio. And testing for continuity... Would my gov gain have something to do with this? It is all set at the standard 600 model via V-Bar Neo V-Link. 12cell 120YGE V-Gov.. 22pin Ratio 9:4:1

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09-20-2017 01:54 PM  14 months agoPost 22
JuanRodriguez

rrProfessor

The Villages, Florida

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At this point I would seek someone with equal or more experience to go through everything on your machine and setup .

Sometimes it takes a second set of eyes to spot something you may have missed ......

Been there, done that and old enough to know better.....

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09-20-2017 01:59 PM  14 months agoPost 23
Anton123

rrApprentice

Canada

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Agree... Going to call Mikado USA.. The guys at my field are even stumped..

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09-21-2017 01:49 PM  14 months agoPost 24
KevinB

rrKey Veteran

Earth

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First, please confirm when you are measuring the pitch on the bench and getting 13 degrees both ways, are you in the actual bank that you are trying to fly in? If not, try that.

If you are getting the requested deflection on the bench measured with a pitch gauge you should be getting it in the air as well. I've never worked on a Goblin. Is there any way the rotor head/main shaft could be sliding up? Ie: a friend recently installed the lower main shaft bearing block upside down in an Align600e. When the assembly slid up as the rotors started to lift, it decreased the pitch on the blades.

You said it was "a simple mechanical fix". I would go back and triple-check everything you touched doing that.
While you are getting 13 degrees on the bench, try grabbing the main blades and putting a little force on them towards zero degrees and see if anything moves or gives way that is not supposed to?

Good luck.

EDIT
Just came across a post of yours in another thread:
"Copied from my post- I have an issue at the moment and have replaced my bec, servos and now my Neo V-link. The symptoms are when I go into flight, it seems as if there is no positive or negative pitch under power... load. And severely delayed. All tests out fine on the bench.. 13- 13+ and servos hold. Even when powered with no blads. Also when throttle cut is hit in flight It will pop and auto. It has been ongoing for 4 weeks. I also changed all of the bearings. And just replaced my motor and esc. Still ongoing..
570 Goblin"

If you are getting full pitch when in throttle hold, it has to be a problem with your radio setup?
You said you checked for approx 13 degrees on the bench. Try it with the blades off and motor running to see if the sevos move the same as with the motor off?

KevinB

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09-22-2017 02:53 PM  14 months agoPost 25
Anton123

rrApprentice

Canada

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Thanks Kevin, I have tried all of that myself and in front of the guys at our field. The strange thing is it was flying fine till one day it was not... Mechanicaly all the same.. It is almost like having no pitch curves in flight.. One thing I have not done is used someones computer for a updated.. It could be a far stretch, but willing to try anything at this point...

And I might add... I believe this all started after a firmware update Via my Radio and erases all of my setting.. Hence getting them all back after a reinstall..

But not sure that could be it.. As my BT 700 is flying Awesome..

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09-22-2017 03:03 PM  14 months agoPost 26
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Please call Mikadousa tech support today so we can talk... 1-844-4MIKADO ext 2...10-5 est

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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09-22-2017 03:08 PM  14 months agoPost 27
Anton123

rrApprentice

Canada

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Great.. Thanks Ronald. Will do.

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09-22-2017 04:05 PM  14 months agoPost 28
JuanRodriguez

rrProfessor

The Villages, Florida

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I'm sure Ron will be able to hook you up....

Quick question (without having to re-read the entire post), have you tried to re-do the setup from scratch using a NEW (not previously programmed) model memory slot ??

My guess would be that your issue is probably a programming related conflict......

Been there, done that and old enough to know better.....

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09-23-2017 08:20 PM  14 months agoPost 29
Anton123

rrApprentice

Canada

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Yes.. I have put a new Neo V-Link along with a new setup. I have also replaced everything electronic and all bearings. With the same affect. The only two things I have not done is update via another PC and a new setup on another radio.

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09-23-2017 11:03 PM  14 months agoPost 30
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Didn't get a call

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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09-23-2017 11:41 PM  14 months agoPost 31
EEngineer

rrProfessor

TX

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He's shy.....

Logo 600SXs, 800XX, TDR IIs

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09-25-2017 12:13 PM  14 months agoPost 32
Anton123

rrApprentice

Canada

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Should hopefully reach out to you tomorrow Ronald

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10-23-2017 12:58 PM  13 months agoPost 33
Anton123

rrApprentice

Canada

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Just a little update, I first want to thank Ronald for taking the time to giving me a helping hand. He spent over an hour of his time helping me via phone. But the problem did not lie within my Neo or
V-Control. As I put the Neo from my 570 into a Mini Comet, both my radio and Neo work as they should Will have to ground the 570 properly and install the original V-bar. But loving this Mini
I appreciate everyones Help.. Happy Flying Will keep you posted on the 570...

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10-23-2017 01:31 PM  13 months agoPost 34
Tyler

rrElite Veteran

Chicagoland area

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I scanned this thread quickly, so I may have missed something.

Recommendations:

Check servos are not weak or have stripped gears. I once had a set of servos that simply had no holding power in flight but appeared to work perfectly on the bench.

Slipping main shaft. If the main shaft can move in flight, the pitch will change. Some helicopters have a retaining collar to hold the main shaft. If over tightened, a small crack can be inflicted, this making the collar useless. I don't know how a goblin is built, never wrenched on one.

Battery pack/bec. I have seen batteries that fall flat on their face when high loads are placed on them. The servos then run out of torque and speed. Rx's and gyros can brown out at times. I crashed three helicopters because of weak Rx battery capabilities, many years ago with different battery technology.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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10-23-2017 09:03 PM  13 months agoPost 35
Anton123

rrApprentice

Canada

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Thanks tyler.. I have tried all of the above. But Will look into other battery packs. I did try a friends with the same affect, but where sitting around for a wile from what I remember.

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07-19-2018 03:39 AM  4 months agoPost 36
Anton123

rrApprentice

Canada

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Well after almost a year and a half of testing and replacing mostly each and every component.. I finally found out what was causing the issue. With the hands on help of Eugene from Rotor Quest..

So basically the swash was binding on the main shaft.. Not allowing full pitch.. Only under load and not on the table... With the friction.. heat and load along with the high RPM caused the metal to expand.. Causing it to bind and stick.. Also one of the radius bearing was ceased up... Not sure how as I replaced them along with the thrust bearing from the beginning of this issue. The fix was to sand the main shaft and lubricant and replaced the radius with everything running smooth.. Tested and bang... Fixed
(I ended up replacing the swash and main shaft)
Hope this post can help others and thanks to any help or feedback that was given..

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HomeRC & PowerAircraftHelicopterRadio - Mikado VBAR Control System › Strange behaviour.. Silver V-Bar and V-Control
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