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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsV-Bar › Vbar Silverline sensor?
07-26-2012 10:06 PM  8 years ago
Individual1

rrApprentice

Florida

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Collective Pitch
I'm getting about 12.5 positive collective pitch and 11.5 negative during setup. I was told that I can keep the collective V Bar slider where it is and adjust the pitch travel in my radio to make them even. My buddy said that Pitch (collective) is the only channel you can do that too without odd effects on the V Bar. Is this true?
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07-26-2012 10:27 PM  8 years ago
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Put the servos at 90 degrees, lock the swash at center, lock the blade grips at zero pitch, reuild your links so you are at zero pitch at center stick. That should fix it OR you can move the centerpoint in the VBAR program also to get equal pitch ranges (+) and (-).....RonTeam MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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07-27-2012 12:05 AM  8 years ago
Individual1

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Florida

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Cyclic
Cyclic servo arms were at 90, swash level, mains at zero before I did the V Bar setup. I've flown it 4 times and it flies great regardless, but I'd like it spot on. Adding 3 to the negative pitch travel fixes this, but I don't want it to have any adverse effects with the V Bar.
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07-29-2012 02:03 AM  8 years ago
aramb

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Macungie, PA

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Here's an update on my rudder CCW drift issue. I got a silverline sensor and put it on the heli and experienced the same problem - this rules out a bad sensor. I did 4 flights on it today trying different things to alleviate the issue and noticed that the drift is not constant. About every second the tail jerks slightly turning the heli CCW. I am not sure if this will provide any additional clue to the source of the problem, but I did notice it today since I was hovering it in close proximity. Too bad I don't live closer to MrMel!!!
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07-30-2012 02:36 PM  8 years ago
aramb

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Macungie, PA

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Just to be sure, I got a new DX18 radio yesterday to rule out the radio as being the culprit with my drift issue. No change. That means it is something mechanical in the heli (not sure what), or a improper setting in either the vbar software or radio. Since it is a new radio, I started with a clean setup in the radio, so I doubt that is an issue. Possibly it is a "bug" with the 5.3 software. I plan to downgrade to version 5.2 and see if that makes any difference.

Does anyone know the process for downgrading the software in the vbar?
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07-30-2012 05:07 PM  8 years ago
rexxigpilot

rrProfessor

rexxig2@comcast.net

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Very simple. Hook the V-Bar to your computer, launch the Vstabi 5.3 software and go to the File dropdown menu, select Firmware Upload. When the selection of firmwares for your V-Bar is displayed, select 5.2 Express/Pro.
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07-31-2012 03:17 PM  8 years ago
aramb

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Macungie, PA

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I downgraded to version 5.2 and it had no impact on my tail drift issue. I am now going to change out the tail blades and see if that makes a difference. I am out of ideas. Please help!!!
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07-31-2012 06:10 PM  8 years ago
rexxigpilot

rrProfessor

rexxig2@comcast.net

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aramb, I suspect you are now on the right course of action. The problem doesn't seem to be the V-Bar. Have you swapped out the tail servo yet?
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07-31-2012 07:08 PM  8 years ago
aramb

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Macungie, PA

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@ Rexxigpilot:

I have done the following to attempt to eliminate the CCW rotation:

-New Tail Servo installed (BLS251) - no change
-New Complete Tail Assembly installed - no change
-New vBar Sensor installed (Silver sensor) - no change
-New Transmitter purchased and setup (DX18) - no change
-Software downgraded from 5.3Pro to 5.2Pro - no change
-Tail linkage adjusted to 3 degrees positive pitch at midstick
-Geartrain checked for tight spots in mesh between main gear and pinion gear - none found
-Geartrain checked for any slipage - none found
-Spectrum Analyzer checked for any odd vibrations - none found
-Trim flight done compensating for rotation - no effect
-Mr Mel has seen the spectrum analyzer images, the vbar log and my vbar settings file and found nothing that would indicate a problem
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07-31-2012 08:25 PM  8 years ago
T-rexn8

rrKey Veteran

CoLoRaDo

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This is kinda scary. Hope you get it worked outXxtreme 800, TDR, 700E DFC, Mini Protos, T-450 DFC, Blade 130x, mcpx, nano
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07-31-2012 08:54 PM  8 years ago
OICU812

rrMaster

Grande Prairie, Alberta, Canada

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This heli of yours sounds cursed lol. Seriously now you have to look at what you have not changed, likely very little. Seems not a Vbar thing, but rather some voodoo action ...Once upon a time there were Nitros, flybars and frequency pins...
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07-31-2012 09:09 PM  8 years ago
aramb

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Macungie, PA

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It really appears to NOT be a vBar issue, YET, I did not have this issue with the BeastX or when it was flybarred with the GY520 tail gyro. However, could it be possible that there is some sort of "interference". Could the servo wire running from the tail servo to the vbar be picking up something? If memory serves correctly, the wire going from the ESC to the vbar and the rudder servo cable run together on the one side of the frame and the wires from the ESC to the motor run on the opposite side of the frame.
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07-31-2012 09:36 PM  8 years ago
OICU812

rrMaster

Grande Prairie, Alberta, Canada

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Well seperating wiring is certainly an easy enough thing to try, you just never know. Your situation is so far out there, it simply "could be"....Once upon a time there were Nitros, flybars and frequency pins...
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08-01-2012 07:31 AM  8 years ago
rexxigpilot

rrProfessor

rexxig2@comcast.net

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aramb, you got any pictures of your setup?
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08-01-2012 11:54 AM  8 years ago
aramb

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Macungie, PA

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Sure... what specifically do you want to see photos of?
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08-01-2012 01:36 PM  8 years ago
rexxigpilot

rrProfessor

rexxig2@comcast.net

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Mostly gear train, plus head and tail pics. Like I said before, it has to be the heli. Too many of us are flying V-Bar without having this issue.
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08-08-2012 09:37 PM  8 years ago
showme409

rrNovice

St. Charles, Mo

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v-bar
I would like to put my 2 cents in on this thread. I have the same issue that Aramb has. I have communicated with him a couple of times about this problem. I have replaced the tail bearings, tail shaft, tail slider, torque tube and bearing, main shaft bearings and motor. My vibs on the analyzer are 128 with tails on and mains off. I moved the ball out on the servo horn to the 3rd hole from center about 13mm and even the 4th hole out per Ready Helis tech help. I have put the gain from 70-120, it makes no difference. Move the I gain from 40-85. I know the V-Bar is suppose to be a good gyro but could it be possible that the controller box isn't working right? I know there are a lot of people that swear by this gyro but there are also people that are having trouble with it. Some problems may be in the setup. Some may be in a defective sensor or control box. In Arambs case, this guy has spent a lot of money trying to fix a problem that may be a bad control box. It's obvious that the sensor is not the problem. If Aramb swaps out the control box that would pretty much eliminated the V-bar, except for maybe the routing of the wires. It just seems to me that no matter what I change in the control box it has no effect on the drift or anything else.
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08-08-2012 10:20 PM  8 years ago
unclejane

rrElite Veteran

santa fe, NM, USA

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Mine is still in the body bag, but if it tests out ok I may put it on whatever replaces my 700N when I get round to it and financially recover lol.

So I'll be interested in finding out what eventually the culprit is. My CCW rotation isn't as bad as Aram's but I did about the same amount of troubleshooting (though I actually replaced the whole heli) and never got to the bottom of it.

It is true that my drift was so slow it could have been a whole bunch of things, but I'm still interested in the resolution all the same...

LS
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08-08-2012 10:45 PM  8 years ago
showme409

rrNovice

St. Charles, Mo

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My drift is about 90 degrees in about 3 1/2 minutes. I don't know how bad that is but I can definitely see it. I had a slight 1/2 wiggle and I believe that moving the ball out to the 3rd hole on the servo arm helped that. The 4th hole did not seem to change anything. What I can't understand is why I move the gain so much and see nothing happen.
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08-08-2012 10:51 PM  8 years ago
unclejane

rrElite Veteran

santa fe, NM, USA

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That's about the rate I was seeing, somewhere between 1/2 and 1 deg. per second. I also had the slow, but decaying wag thing originally, but MrMel correctly diagnosed that as not enough mechanical gain on the tail. I moved the ball out on the horn 2mm (IIRC) and that more or less fixed that.

BTW, it's not the control box, we replaced the entire unit on mine and the CCW rotation persisted.

But other than that, it was absolutely impeccable. My 700N flew like Patty Wagstaff at any rotor speed I wanted. Unfortunately, also like an arrow directly into the ground in an instant of disorientation lol.

I really should take mine out of the body bag and do a bench check on it to see about putting it in a new heli...

LS
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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsV-Bar › Vbar Silverline sensor?
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