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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsV-Bar › New Big problem started today
04-24-2011 07:39 PM  7 years agoPost 1
DavidLD

rrVeteran

Radcliff, KY

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Since I've had the V-Bar/DX8 combination, I've experienced an interesting initialization sequence most of the time. About once out of 7-10 times cycling power, I'll get the normal double pump of the swash when V-Bar is finished initializing, but most of the time, it will pump 34 times. (I'm pretty sure it's always 34, I've only counted a couple of times.) After that, the radio is bound, range check works and it seems to work just fine. Is this bad or has anyone experienced this?

Today I had to stop flying because of a new issue. I did my first flight for a full tank and everything seemed normal. Did some piro flips, inverted hovers and a little stick banging. I decided to add a little expo on the radio because I've been using 0. I have since taken the expo back out but it's still repeating this new problem so I don't think the radio change had anything to do with it: When I idle up (1 or 2), as the rotor rpm speeds up, the heli starts pitching forward drastically - so much that I have to hold all the way back on the elevator so I quickly switch back out of idle up to keep from crashing???

I've verified that there is no mixing in the radio. In fact, the only thing that changed was me adding about 20 expo on the DX8 (Aileron and Elevator), which I've since removed. It does this every time now and in both idle 1 and idle 2. I'm stumped as I had just had a good 5 minute flight about 20 minutes before. Any guesses as to what's happening??


Dave
Synergy and Logos

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04-24-2011 08:01 PM  7 years agoPost 2
DavidLD

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Radcliff, KY

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I failed to mention this problem only happens in flight. When the heli is on the bench, I can cycle through all flight modes with the throttle at approximate flight settings and the swash doesn't budge at all. But in flight, when I idle up, forward she goes


Dave
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04-25-2011 12:06 AM  7 years agoPost 3
jbiter

rrKey Veteran

Sebring, FL

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Are you familiar with the event log located under the info tab? Try posting a copy of your event log here so we can take a look at it.

Jeff

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04-25-2011 12:09 AM  7 years agoPost 4
Thumpernator

rrKey Veteran

Senoia, Georgia, USA

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I wouldn't rule out bad pots in the DX8.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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04-25-2011 01:52 AM  7 years agoPost 5
eddiscus

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Dumont, NJ-USA

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David
The 34 pumps I read some where else could be a power issue to v-bar. Try powering up using a receiver battery instead of the BEC and see if you get a normal bootup of the V-bar.

Connect to the v-bar and go into into the setup for the radio and check that with the sticks in their neutral position that the v-bar reads 0 in normal, idle 1 and 2. Also look at the log and check for vibration alerts. You may have picked up a vibration that happens when you go into idle 1 and 2 that interfears with the sensor.

Post what you find.

Logo Xxtreme 800
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Citizen 142
Synergy 766
TDR 2

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04-25-2011 04:18 AM  7 years agoPost 6
Scott1115

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Greenwich, CT

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thoughts....

the 34 pumps might be due to where you are introducing power to the v-bar.

I really doubt any addition/subtraction of expo would change the pitch on the swash. After 2 flights today, I ran into a weird swash issue too. All of a sudden I had a large amount of neg cyclic. I checked my transmitter to make sure it had no trims. I then looked at the heli and realized that the elevator servo did not have proper geometry...the center point has moved. I removed the servo wheel and reapplied in proper geometry and redid set-up in the vbar software.

Compass 7HV, Trex 550E
RCRCC

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04-25-2011 07:44 AM  7 years agoPost 7
swat310

rrApprentice

Mesa Arizona

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clear your radio and start from scratch do a hole new set up and see if it goes away. should only take you 10mins

Trex 450pro V-bar, 700E V-bar 550 V-bar 600N & 250

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04-25-2011 03:15 PM  7 years agoPost 8
eddiscus

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Dumont, NJ-USA

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Some reading for you David on the 34 pump issue. May also be related to a Bad sensor.

http://www.helifreak.com/showthread.php?t=292565

Logo Xxtreme 800
Logo 700
Citizen 142
Synergy 766
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04-25-2011 03:25 PM  7 years agoPost 9
DavidLD

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Radcliff, KY

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Ed,

Thanks!! Thats kinda scary but a relief all at the same time. If it is a bad sensor, I'm assuming Mikado will fix it for me. At the same time, I've been flying the 700 nitro all along


Dave
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04-25-2011 04:18 PM  7 years agoPost 10
MrMel

rrProfessor

Gotland

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Bad sensor is one out of 5 different things that gives 34 pumps at init, by far the most uncommon one.
If it's the Pro version the log can tell you exactly what it is.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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04-26-2011 11:12 AM  7 years agoPost 11
Nycatt

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New York

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Bad sensor is one out of 5 different things that gives 34 pumps at init, by far the most uncommon one.
MrMel, what's the other 4 things? Just wondering since I'm the one that setup David's heli.




Team Synergy
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MKS Servos
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Vteam

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04-26-2011 11:14 AM  7 years agoPost 12
MrMel

rrProfessor

Gotland

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- Heli moving during plugging in pack
- Radio outputting instable signal (bad pot) or Receiver/RX producing unstable signal
- Unstable voltage from BEC/RX pack (usually only BEC's)
- interference via USB cable (quite common from some computers)

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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04-26-2011 11:24 AM  7 years agoPost 13
Nycatt

rrElite Veteran

New York

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Well we can rule out the USB cable and the moving during powering up. I can see the unstable voltage since he's using a Align 2in1. I can also see the radio, it's a Brand New DX8.....I'm a Futaba guy and never had the vbar pump 34 times on the 4 vbar helis I've setup. Not saying it's the radio.




Team Synergy
Rail Blades
MKS Servos
Thunder Power
Vteam

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04-26-2011 12:03 PM  7 years agoPost 14
MrMel

rrProfessor

Gotland

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Ive checked his log on another crosspost, its dosn to sensor being too far off center or heli moving, he has been redirected to vstabi team as they have more ways of testing.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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04-26-2011 03:34 PM  7 years agoPost 15
Kevin Feil

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Newnan, Georgia, USA

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V-BAR ISSUE
GIVE ready heli a call of Email. Ask for Ernie or Bryan, These guys are Very Sharp, They have help me alot. Those guys are Awesome. It's highly unlikely that the Sensor failed, They just don't do it. Have you had alot of Crashes?? I just had a similar problem with one of my FBL trex 6. Took off all is well, noticed i was having to feed a little bit more as far as cyclic to keep it level. came in and landed and the Aileron Servo,(8717) was jumping all over the place. However only with a load on it. A good thing to do when you preflight your heli especially FBL is to grab hold of the Servo Wheel and try to turn it with everything turned on. If it starts to "buck" on you then it's Bad. I would have never figured it out until i happen to grab Mine and felt it. It worked fine on the table and went to Hell when I went to fly.. Just a THOUGHT. Not saying this is the issue but it's always something to check Every Time you fly a FBL. Good luck on your Quest for the answer.

Best,
Kevin

" hollywood3160 "Team Synergy Factory Specialist, Team Futaba,Morgan Fuels, FBL RotorsUnlimited

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04-26-2011 03:36 PM  7 years agoPost 16
MrMel

rrProfessor

Gotland

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This is not a sensor failure, its a built in tolerance threshold that has been passed, it will fly just fine as long as its correcting correctly, just that it complains with 34 pumps at start.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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04-27-2011 02:06 AM  7 years agoPost 17
Zaaaguy72

rrElite Veteran

MN

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I had all kinds of problems with my Dx-Eight and vbar initializing wrong. Even after I sent it to Horizon and had new pots and upgrades put into it. I eventually got so frustrated I sold the Spektrum and got a different radio. Let me just say that the problems magically disappeared.

Team Sanjel!

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04-27-2011 02:14 AM  7 years agoPost 18
CX1

rrKey Veteran

Canada

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if it worked fine before then suddenly acted up on your nitro
maybe something has come loose < fan?

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04-27-2011 04:00 AM  7 years agoPost 19
DavidLD

rrVeteran

Radcliff, KY

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At this point, let me just say that Mikado took a look at the V-Bar Pro log file I uploaded and said that based on that information, I needed to send my unit in for inspection/service. As inconvenient as it is to miss a weekend of flying, I'm glad that Mikado is taking the issue seriously and trying to take care of me. I'll send the V-Bar in to HH and see what happens. I'm sure a simple replacement will fix the problem if I got a hold of a lemon. It happens in mass manufacturing. I'll keep you posted.

/r,
Dave


Dave
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06-08-2011 11:30 AM  7 years agoPost 20
DavidLD

rrVeteran

Radcliff, KY

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Just realized I never posted an update to this thread -.-

HH told me it would be up to a month to get the unit repaired after mailing it to them and they sent it to Mikado, then reverse etc etc.

However, a few days after sending it to them, I get an email from HH saying "your order has shipped." Turns out they just sent me a new one anyways.

I set this one up and it has worked perfectly from the first power-on. I love this unit. I'm able to try out up to 3 configurations per trip to the field (3 mode switch on the radio) as I don't have the portable module yet.

All I know is I'm able to fly my Trex700 like the sim now and am having a blast!


Dave
Synergy and Logos

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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsV-Bar › New Big problem started today
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