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HomeAircraftHelicopterFlybarless Rotor Head SystemsV-Bar › Mini Vbar issues on 450 pro V2
08-09-2012 02:39 AM  6 years agoPost 1
knightofcarnage

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chicago

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The main issue i'm having is the tail stops holding , then i'm stuck fighting the gyro to set it down. It usually massively drifts to left with torque. Now i notice that couple small pitch pumps follow by a fast forward flight sets its off. It seems to happen in mid flight. Mechanical it seems to be set fine (86 CCW 78 CW zero pitch on tail)

Here what test and debuted

1) No issue with Loosing Head Speed. Check the logs on the ESC
2) Tried a second tail servo (9257)
3) Tried a second tail assembly
4) Tried to use a diffrent mounting tapes
5) I played around with all setting under the advanced tab.

What i did noticed that i'm getting lots of "Init Failed, retrying..."

I starting to think the sensor is bad. Its last then 1 week old. So much for doing a comparison between cgy750.


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08-09-2012 11:08 AM  6 years agoPost 2
wrongler

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Brewerton, New York

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Just a guess, Where is the gain set in the tail?

Bill Whittaker

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08-09-2012 11:13 AM  6 years agoPost 3
John in Atlanta

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Atlanta, GA, USA

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Are you sure all trims are zero on the tx and did you properly calibrate the tx in the setup menu?

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08-09-2012 03:29 PM  6 years agoPost 4
knightofcarnage

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chicago

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Just a guess, Where is the gain set in the tail?
main gain is between 60-75 . I'm using the aux channel setup.
Are you sure all trims are zero on the tx and did you properly calibrate the tx in the setup menu?
Yes calibrated the TX, Reversed all the channels and then set center.
I check all the trims for each flight condition and they are set to 0.
Now i do wonder if upgrade from express to pro effected the calibration. I will try a completely new setup.

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08-09-2012 10:01 PM  6 years agoPost 5
John in Atlanta

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Atlanta, GA, USA

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I too had a lot of problems withe the tail on my Trex 450 Pro V2.

Changed the bearings and installed the new tail

450PRO Metal Tail Pitch Assembly H45179

No more problems

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08-09-2012 10:47 PM  6 years agoPost 6
knightofcarnage

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chicago

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I might have it solved. Looks like it might have been cause by not re-triming the TX after upgrade to pro. Now i don't have the massive drifts but in pitch pumps it does a kick CCW. This should be solve with playing around with acceleration , p-gain , d-gain and torque pre-comp. I should be able to retest tomorrow.

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08-16-2012 03:46 AM  6 years agoPost 7
knightofcarnage

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chicago

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I jump the gun the tail issue is still there. Anyone else have another ideas?

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09-02-2012 04:35 PM  5 years agoPost 8
Andy from Sandy

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Bedfordshire, UK

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A device is more likely to fail in its first week than it is if it has survived a few months.

I would say your figures are a bit low and you may want to consider moving the ball in at the servo.

A drift is almost certainly vibration and a kick during climb outs indicates a lack of tail authority.

If you are running Express you can run the model up on the bench and look what the maximum figure for vibration is through the computer software. Remove the main blades and the rudder control rod first.

On my 450 I have a mini v-bar mounted solid with a strong double sided tape.

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09-02-2012 06:13 PM  5 years agoPost 9
brian94066

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San Bruno, California

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Try to get the tail limits to be in the 100s

mine are 115/116 and my tail holds like a rock

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09-03-2012 05:51 AM  5 years agoPost 10
knightofcarnage

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chicago

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I sent the unit back to get tested. I should know the status this week.

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09-03-2012 07:00 PM  5 years agoPost 11
beast

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Laurel MD

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vibration analysis and download log file if running the pro. had similar issues with one that had excessive vibes.

.Beresford

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09-04-2012 06:20 AM  5 years agoPost 12
knightofcarnagerrElite Veteran - chicago - My Posts: All  Forum  Topic

Max vibration was around 500 peak. So its was not vibrations. Here is an example of my logs:
A Coldstart is done on the beginning of each switch on time. A Coldstart can happen only, if the VBar Units is disconnected from power for more than 5 Seconds.

This happens if power is applied to the VBar unit. Usually this is ok, but it shall never happen in operational mode. So if a reset happens during flight, this points to a power problem. During flight the power on reset results in a warmstart. If a coldstart happens during flight, the power loss was more than 5 Seconds

Bank 0 was loaded from the non volatile memory. This can be triggered my manual backswitch from the userinterface as well as in flight if bank switch is programmed to the aux channel. On Startup the Bank 0 is loaded by default.

The Init process of the sensors is very sensitive to movements of the heli or from other external disturbances, i.e. Voltage jumps and glitches. This can lead to a failed initialization. In this Case repeated. If this repeats itself all the time, this can point to a defective sensors.

The Init process of the sensors is very sensitive to movements of the heli or from other external disturbances, i.e. Voltage jumps and glitches. This can lead to a failed initialization. In this Case repeated. If this repeats itself all the time, this can point to a defective sensors.

The Init process of the sensors is very sensitive to movements of the heli or from other external disturbances, i.e. Voltage jumps and glitches. This can lead to a failed initialization. In this Case repeated. If this repeats itself all the time, this can point to a defective sensors.

The Init process of the sensors is very sensitive to movements of the heli or from other external disturbances, i.e. Voltage jumps and glitches. This can lead to a failed initialization. In this Case repeated. If this repeats itself all the time, this can point to a defective sensors.

The Init process of the sensors is very sensitive to movements of the heli or from other external disturbances, i.e. Voltage jumps and glitches. This can lead to a failed initialization. In this Case repeated. If this repeats itself all the time, this can point to a defective sensors.

The Init process of the sensors is very sensitive to movements of the heli or from other external disturbances, i.e. Voltage jumps and glitches. This can lead to a failed initialization. In this Case repeated. If this repeats itself all the time, this can point to a defective sensors.

The Init process of the sensors is very sensitive to movements of the heli or from other external disturbances, i.e. Voltage jumps and glitches. This can lead to a failed initialization. In this Case repeated. If this repeats itself all the time, this can point to a defective sensors.

The Init process of the sensors is very sensitive to movements of the heli or from other external disturbances, i.e. Voltage jumps and glitches. This can lead to a failed initialization. In this Case repeated. If this repeats itself all the time, this can point to a defective sensors.

At each Coldstart, the sensor and RC Values are calibrated to the actual seen values. If the calibration is finished, this message confirms the storage of data into the internal non volatile calibration memory
There where a lot of starts up in my logs with repeat Failed to Init after a power up.

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11-09-2012 09:55 PM  5 years agoPost 13
knightofcarnage

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chicago

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Ok after return my unit ReadyHeli and waiting over 2 months to get it back (actual i got a replacement). Everything is starting to make sense: Here is the latest firmware update from Vstabi

The following issues are addressed:

● The dynamic drift corrections could calculate wrong values in some cases. This usually leads to a very slow drift at the end of a long flight. This is fixed with this version
● Corrections of the governor management in case of bank switch usage. The ramps between the headspeeds and the startup ramps are now calculated better.
● New Governor Mode for AR Bailout in combination with bankswitching.
● Latest Bluetooth Modules of Mikado are now supported directly
● Some issues with Savox Servos that do not bootup sometimes have been fixed. However this does not work always, so there may be configurations where the fix dosent help.
● Improved error reporting on switch on/off transitions of the governor
● Adaption of PC Software for the above issues.
● The dynamic drift corrections could calculate wrong values in some cases. This usually leads to a very slow drift at the end of a long flight. This is fixed with this version
I don't think it need to be a long fight ( about 2 to 3 mins into a battery) but 100% sure this was my issue. I just wish my case was handle differently. But now my season is over and i can't test it and confirm it till next year.

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11-09-2012 10:32 PM  5 years agoPost 14
BobOD

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New York- USA

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Wow, that's a bummer. Over 2 months to replace a defective product. You're more patient than I would be.

Team POP Secret

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11-09-2012 10:46 PM  5 years agoPost 15
ZS-JAF

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Nazareth, PA

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I had an issue with my 450 pro that seemed to be Gyro related, but it was tail bearing related instead. I tried 3 servos 2 FBL units. If you do the blade grips up to tight or get any lock tight on them they will bind some times. I had it where it was good until mid flight. Intermittent weird stuff just something else to check. I also like the grip flip trick. Good luck

I have a 3D heli, I don't understand why it doesn't do 3D

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11-10-2012 08:31 AM  5 years agoPost 16
OICU812

rrMaster

Edson, Alberta, Canada

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Trex 450, silly Q did you flip the TR grips? Mine in stock format, actually every 450 in stock format was absolute JUNK. Flip the tr grips and an amazing amount of crap things in flight just dissapeared.

...Once upon a time there were Nitros, flybars and frequency pins...

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11-11-2012 07:35 AM  5 years agoPost 17
GetToDaChopper

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Las Vegas , NV

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Aw the old "taco dude" fix.......

    ▲
  ▲ ▲
▲ ▲ ▲ One of a Kind !!!

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11-11-2012 07:41 AM  5 years agoPost 18
OICU812

rrMaster

Edson, Alberta, Canada

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Oh ya I guess lol that's digging back into memory.

...Once upon a time there were Nitros, flybars and frequency pins...

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11-12-2012 03:00 AM  5 years agoPost 19
knightofcarnage

rrElite Veteran

chicago

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Trex 450, silly Q did you flip the TR grips? Mine in stock format, actually every 450 in stock format was absolute JUNK. Flip the tr grips and an amazing amount of crap things in flight just dissapeared
You don't need to flip the grips. you can just move the set screw and it will fix the problem. Anyways the problem was nothing mechanical. I know the 450 pro like the back of my hand. Currently I put on the new tail setup, It seems to have fixed the geometry issue. At first the problem was i could not get the tail working with pitch pumps. After some work with geometry and pre-comp i got it almost right. Then i started to do some testing in slow circuits and mild 3D. And here where the weird issues started. In slow forward flight, the modle (mid pack) would loose its hold on the tail ans slowly skew. Eventaly a 180. My favor was when i was doing a tic-toc. In middle of one the tail turned 90 deg and then another 90 deg. Almost like i was doing a 4 point tic-toc. Anyways i hope i get to test out the new firmware sometime this week.
Wow, that's a bummer. Over 2 months to replace a defective product. You're more patient than I would be.
I will vent later about this, THERE IS A LOT MORE to the story.

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11-12-2012 03:41 AM  5 years agoPost 20
OICU812

rrMaster

Edson, Alberta, Canada

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Well ill try stock config again and move the tr hub outwards a tad more then and see how it fairs.

...Once upon a time there were Nitros, flybars and frequency pins...

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