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HomeAircraftHelicopterMain Discussion › v-bar swash drift on bench when full collective
03-10-2015 02:54 AM  3 years agoPost 1
wc_wickedclown (RIP)

rrProfessor

long beach calif

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anyone else have this problem
happens when i switch to idle 2
normal and idle 1 are ok

Insha Allah made in america

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03-10-2015 03:12 AM  3 years agoPost 2
tyfast27

rrApprentice

Dubois, Wyoming

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Yea mine drifts forwards on my nitro, fullsize black v-bar with 5.3 pro. When I fly it's stable as can be though.

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03-10-2015 03:14 AM  3 years agoPost 3
wc_wickedclown (RIP)

rrProfessor

long beach calif

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ty

Insha Allah made in america

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03-10-2015 03:48 AM  3 years agoPost 4
rcflyerheli

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Granbury, TX USA

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What is your definition of drift? Is it jumping abruptly when you go to IU2 or does it slowly start to move? I've seen my swash on the bench move slowly, but like tyfast, I don't see or feel it happen in flight.

If it is changing with constant collective, but merely when changing to IU2, that sounds like a pitch curve concern. BTW not stumping for the Vbar control, but I don't see any swash changes since I switched over to it.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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03-10-2015 04:21 AM  3 years agoPost 5
EEngineer

rrProfessor

TX

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WC, check things with the VBar menu engaged....

I think what you're seeing is it's "fbl loop" on....when in the VBar "Setup Menu" the "fbl loop" is dis-engaged...and adjustments can be correctly made...

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03-10-2015 05:06 AM  3 years agoPost 6
wc_wickedclown (RIP)

rrProfessor

long beach calif

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EEngineer
WC, check things with the VBar menu engaged....
I think what you're seeing is it's "fbl loop" on....when in the VBar "Setup Menu" the "fbl loop" is dis-engaged...and adjustments can be correctly made..
loop is engaged thank you
ill disengage it and check it out and see what happens
rcflyerheli
What is your definition of drift? Is it jumping abruptly when you go to IU2 or does it slowly start to move? I've seen my swash on the bench move slowly, but like tyfast, I don't see or feel it happen in flight.
If it is changing with constant collective, but merely when changing to IU2, that sounds like a pitch curve concern. BTW not stumping for the Vbar control, but I don't see any swash changes since I switched over to it.
slowly starts to move

Insha Allah made in america

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03-10-2015 05:10 AM  3 years agoPost 7
rcflyerheli

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Granbury, TX USA

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I agree with EEngineer that if you are not in setup mode, you have the loops engaged, and the sensors will cause slow drift of the swash.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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03-10-2015 05:14 AM  3 years agoPost 8
EEngineer

rrProfessor

TX

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in setup mode
Many times I have found myself in the "Main Vbar Menu"....not in the "Setup Mode".....touch the heli...WTF?.....

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03-10-2015 05:31 PM  3 years agoPost 9
dahld

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Bakersfield, CA, USA

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I have a Logo 600SE in a Uvular fuse, and the swash drifts slowly on the bench when the system is powered-up. It usually ends-up in the full forward right cyclic position.

But once I start the spool-up and wiggle the sticks, it comes off the ground straight and flies true.

I have several other models in which this doesn't happen, and I don't know why the one model acts differently, but they all fly good.

FWIW...

(-: Dave

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03-10-2015 09:34 PM  3 years agoPost 10
Futura SE

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Fayetteville, Arkansas

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I too like Dave have had several vbars that would not drift any on the bench. I have had one or two that would drift no the bench but was fine in the air.

I had ONE in over 10 years that would drift ONLY after things heated up. By heating up the sensor (Blueline Full-size) was about 1/2" from motor and the hot air being blown on it by the motor about 1.5 minutes into flight it would make the model drift aft and pretty bad. You could replicate on the bench after I figured out it was heat by taking a hair dryer and blowing on the sensor and sure enough it would make swash drift and in less than 20 seconds of warm air hitting it the swash was full aft cyclic on the bench. Just power the model on and everything being ambient it would never drift. The sensor was swapped out by Mikado USA and all was perfect.

I had spare sensors to swap so I knew right away it was a sensor issue as the problem disappeared instantly with a swap but it took a while to figure out what the culprit was...

1. Is the sensor being exposed to changes in temp?
2. Does it drift in flight or bench only?
3. Does it take things rotating to trigger? VIBRATION if it does and that is a airframe issue...

These are a good checklist when troubleshooting a sensor drift issue...

Team Mikado USA -- Team Insane Canopy -- Team Scorpion -- Team Evo Power Batteries

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03-10-2015 09:54 PM  3 years agoPost 11
wc_wickedclown (RIP)

rrProfessor

long beach calif

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bench only
with pitch gauge mounted

Insha Allah made in america

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03-10-2015 09:56 PM  3 years agoPost 12
Futura SE

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Fayetteville, Arkansas

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If there is no drift in the air then it is of no concern and the sensor is within specs and you are good to fly it.

Team Mikado USA -- Team Insane Canopy -- Team Scorpion -- Team Evo Power Batteries

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03-10-2015 10:01 PM  3 years agoPost 13
wc_wickedclown (RIP)

rrProfessor

long beach calif

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ty

Insha Allah made in america

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03-10-2015 10:09 PM  3 years agoPost 14
dahld

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Bakersfield, CA, USA

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I guess I would just add that during flight the control loop from the sensors through the algorithms and back again is happening and updating in milliseconds, and the heli is constantly moving adding more inputs for the control loop system to crunch...thus what we see in a static situation on the bench is not what's happening in the air.

If it flies OK and the log is clean, I'd say no worries.

(-: Dave

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03-11-2015 01:54 AM  3 years agoPost 15
Futura SE

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Fayetteville, Arkansas

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Yes the sensor will do all KINDS of strange things onto bench. They are made to function in the air. I know everyone understands that but what isn't so easy to pick up at least for me is it also will do ODD things on the ground...

Team Mikado USA -- Team Insane Canopy -- Team Scorpion -- Team Evo Power Batteries

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03-11-2015 02:29 AM  3 years agoPost 16
wc_wickedclown (RIP)

rrProfessor

long beach calif

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ty

Insha Allah made in america

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03-11-2015 07:48 PM  3 years agoPost 17
HeliViewAerial

rrNovice

Ormond Beach, FL

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Are you using a separate Rx? If so, AFTER you've done your complete VStabi setup, REBIND your Tx to your Rx at its "new" failsafe location. Swash drift solved.

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03-11-2015 08:06 PM  3 years agoPost 18
wc_wickedclown (RIP)

rrProfessor

long beach calif

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ok will rebind

and running sbus

Insha Allah made in america

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03-11-2015 11:38 PM  3 years agoPost 19
HeliViewAerial

rrNovice

Ormond Beach, FL

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Sweet! Let me know if that solves it! Another possible issue is too much tension on the sensor wire. Mostly re-binding though, lol

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03-11-2015 11:55 PM  3 years agoPost 20
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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Sometimes there are differences in TX trims (pots) that VBar picks up but not seen in trim steps on TX screen . You will not see in flight because the differences are nominal and does not effect flight .

I stole it ,flew it and gave it back ;)

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HomeAircraftHelicopterMain Discussion › v-bar swash drift on bench when full collective
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