RunRyder RC
 4  Topic Subscribe
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 2839 views
Scorpion Power Scorpion Power
HelicopterFlybarless Rotor Head SystemsV-Bar › Vbar drift left in hover
12-01-2011 07:17 PM  5 years agoPost 1
alec photo

rrNovice

California

My Posts: All  Forum  Topic

I've had a constant but nagging slow left drift on my Trex 450 with the MiniV during hovers. I have re-done the swash so many times that I can do the damn thing blind folded. My 5065 servo arms are zeroed, set for 100% travel and 90 to the main shaft, swash is mechanically leveled! and Vbar fine-tuned leveled throughout the stick travel (w/just a few clicks). I checked the Vbar Specktrum Analyzer and vibes are below the yellow line (w/o main blades). I have tried various Vbar adjustments in the swash "Gyro Gain" and tail "Gyro Gain".But still that nagging drift to the left.

So today I added 3 right-clicks on my DX8 and the problem is gone. I know were not suppose to use any Tx trim, so what am I doing wrong?

PM  EMAIL  GALLERY  Attn:RR  Quote
12-01-2011 07:24 PM  5 years agoPost 2
Ronald Thomas

rrMaster

Gainesville, Fl, USA

My Posts: All  Forum  Topic

Either the tx is not calibrated properly, the swash is not level, CG is off, you went from a hot car to a cold field and did not let the heli acclimate, or there is a vibration problem somewhere. Those are the things that will cause a drift.

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

PM  EMAIL  GALLERY  Attn:RR  Quote
12-01-2011 07:25 PM  5 years agoPost 3
Ronald Thomas

rrMaster

Gainesville, Fl, USA

My Posts: All  Forum  Topic

Also if the sensor is mounted incorrectly it may cause issues as well

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

PM  EMAIL  GALLERY  Attn:RR  Quote
12-01-2011 07:47 PM  5 years agoPost 4
alec photo

rrNovice

California

My Posts: All  Forum  Topic

laughingstill I bet your dead-on, so I'll keep looking...... thanks for the advice

Either the tx is not calibrated properly, Vbar centered and zeroed, but I'll see if I missed something here. I too suspect my problem may be here the swash is not level, Swash leveled throughout the travel w/ Trueblood swash leveler CG is off, to see if the heli was more weighted to the left side I checked CG by lining up the blade over the boom with CF rod under round section of blade grips you went from a hot car to a cold field and did not let the heli acclimate, hmmmmm or there is a vibration problem somewhere. my vibes are below yellow line w/o main blades Those are the things that will cause a drift.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-01-2011 07:50 PM  5 years agoPost 5
Ronald Thomas

rrMaster

Gainesville, Fl, USA

My Posts: All  Forum  Topic

Do you have a Bluetooth module? That way you can check vibes with the blades on. Try new blades also?

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

PM  EMAIL  GALLERY  Attn:RR  Quote
12-01-2011 07:51 PM  5 years agoPost 6
alec photo

rrNovice

California

My Posts: All  Forum  Topic

Yes, I have the ebay module and I leave it on all the time so I make changes at the park with my Android or laptop. I have 2 sets of extra blades I'll give them a try.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-01-2011 09:13 PM  5 years agoPost 7
ke6d

rrApprentice

San Jose, CA

My Posts: All  Forum  Topic

If the CG is OK, have you tried to autotrim?

My Fleet: T-Rex 700e VBar, T-Rex 600e VBar, Logo 500 VBar, T-Rex 500 VBar, T-Rex 450Pro VBar

PM  EMAIL  GALLERY  Attn:RR  Quote
12-01-2011 10:03 PM  5 years agoPost 8
MrMel

rrProfessor

Gotland

My Posts: All  Forum  Topic

Check radio Trim in each flightmode, including hold. i.e. Check monitor function.

also check monitor if when you wiggle the stick it returns to zero each time, some does not, then it's time to send to horizon.

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

PM  EMAIL  GALLERY  Attn:RR  Quote
12-02-2011 07:10 AM  5 years agoPost 9
Sam2b

rrElite Veteran

Seattle, WA

My Posts: All  Forum  Topic

alec photo,
Did you also spool up with the tail blades still on and main blades off? Tail rotor assemblies that are off kilter (or tail blades off balance) can be the cause of terrible vibration issues on any helicopter. Just hold onto the boom with two hands or bolt the heli landing gear to the work bench, spool up, and feel the chassis for buzzing or vibes.

I'd like to know your exact method of leveling the swash. I've witnessed drifting corrected when the swash leveling was re-visited, and then problem solved. So many believe they do it the correct way but are still off. I would advise against relying on auto trim if you have the ability to perfect the swash throughout the entire collective range. Any time trim is used it is making up for required mechanical adjustment. 90 degrees mechanically first, and perfect CG next. As for me I have never used the auto trim and have had near-perfect results (I know that last statement doesn't help one bit, but just say'n )

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-02-2011 07:05 PM  5 years agoPost 10
alec photo

rrNovice

California

My Posts: All  Forum  Topic

Sam here are my steps to level my swash. This is of course after completing the 8 previous Setup Steps in Vbar. All steps are performed in Vbar>Trim tab. I'm new to heli so please correct me in my steps where I have screwed up.

1) To 90-degree my servo arms to the main shaft, I use a see thru clear plastic ruler, the one with red grid lines throughout. I line up the horizontal grid lines to the holes on the servo arm and then make adjustments inVbar>Trim tab>Servo tab>ch1,ch2,ch3 until the vertical grid lines are parallel with the main shaft, effectively making the servo arms 90 degree to the main shaft. Additionally as per MrMel video recommendations I'm able to center my servo arms with values less than 40 (ie, -36,35,23).

2) Place the swash leveler on the shaft and I adjust the 2 swash links (with complete turns) to the lowest link until the swash is mechanically perfectly level. By adjusting to the lowest link, I feel it centers my swash on the main shaft and helps minimize the difference between the high&low stick within .5 (measured with a RCLogger digital gauge at Vbar>Collective tab). If any fine adjustments to level my swash are necessary, I use Vbar>Trim tab>Swash tab>Cyclic.


3) Once the swash is level at mid stick, I use Vbar>Trim tab>Expert hat,... to make leveling adjustments for high stick and low stick position. The swash plate should now be level throughout the swash travel.

4) Next confirm the measurement of the two pitch links for 30mm, and install the rotor head. Line up the pitch link so it lines up vertically centered with the main shaft and move the swash driver up or down until the arms are parallel, now tighten in place.

5) Finally I fold the blades 90 deg to the blade grip spindle axis on one side and measure from the workbench to the tip of the blade. I use the Vbar>Trim tab>Swash tab>Collective adjustments until they are even, thus giving me zero pitch and presumably a level swash plate. NOTE: I realize adjustments to get zero pitch in the Vbar>Trim tab>Swash>Collective alters the Servo Center values, however it appears that Vbar makes equal adjustments across all three channels.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-06-2011 02:46 AM  5 years agoPost 11
GetToDaChopper

rrElite Veteran

Las Vegas , NV

My Posts: All  Forum  Topic

the thing is if the swash is totally level the heli will always get pushed to the left from the tails thrust when in a hover, most all heli's will need some swash trim to the right to counter this.

how much trim to the right depends on the heli in queston as all heli's are different.

some heli's (mostly the cheap rtf heli's) have the main mast tilted to the right a little to counter the tails thrust, just look closely at a blade msr.

    ▲
  ▲ ▲
▲ ▲ ▲ One of a Kind !!!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-06-2011 05:54 AM  5 years agoPost 12
Sam2b

rrElite Veteran

Seattle, WA

My Posts: All  Forum  Topic

Alec Photo,
nicely done. I commend extra effort. But in an effort find a possible vibration did you also spool up with the tail blades still on and main blades off? Several times I've helped others erase their gyro issues by targeting the tail mechanical parts including blades. I'm excited to hear what you may find.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-08-2011 06:57 AM  5 years agoPost 13
alec photo

rrNovice

California

My Posts: All  Forum  Topic

Sam my next test is to run the heli without the rotor head and the tail blade grip so that I can observe the shaft for any signs of a bent shaft.

Then re-install the tail blade grips (w/blade) and spool up with Vbar vibe analyzer. Then spool up a 2nd time again this with the main rotor head (w/o main blades). And finally try another set of new Align 3G blades.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-08-2011 03:08 PM  5 years agoPost 14
cgflyer

rrApprentice

Boca Raton, FL

My Posts: All  Forum  Topic

Hi Alec, might sound silly but I have seen several 500 size heli's with this and a simple change of the mounting tape to a more firm type corrected the problem.. Might not be your issue, but sure worked with them and you seem to have tried almost everything else. Just a thought.

Rich

PM  EMAIL  GALLERY  Attn:RR  Quote
12-10-2011 12:14 AM  5 years agoPost 15
alec photo

rrNovice

California

My Posts: All  Forum  Topic

cgflyer you may be on to something. Seeing how I tried pretty much everything else, I'll give that a try... it couldn't hurt. So your suggesting something firmer?

PM  EMAIL  GALLERY  Attn:RR  Quote
12-10-2011 02:17 AM  5 years agoPost 16
cgflyer

rrApprentice

Boca Raton, FL

My Posts: All  Forum  Topic

Alec, try the red pro servo tape from ReadyHeli, https://www.readyheli.com/PARC8044-...36_p_37259.html

Rich

PM  EMAIL  GALLERY  Attn:RR  Quote
12-10-2011 02:22 AM  5 years agoPost 17
Sam2b

rrElite Veteran

Seattle, WA

My Posts: All  Forum  Topic

Are you kidding me?? Never use that stuff on sensors, especially the Vbar!!

Use either Futaba foam mounting pads, or Spartan foam mounting pads.

https://www.readyheli.com/FUTQ1000-...-3_p_32857.html

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-10-2011 02:31 AM  5 years agoPost 18
cgflyer

rrApprentice

Boca Raton, FL

My Posts: All  Forum  Topic

Sam, every machine is different and I have seen this used many times and am using it myself on bothe the 550 and the Logo 500. I would not suggest something I had not tried and found successful my self.

Rich

PM  EMAIL  GALLERY  Attn:RR  Quote
12-10-2011 03:19 AM  5 years agoPost 19
Ronald Thomas

rrMaster

Gainesville, Fl, USA

My Posts: All  Forum  Topic

I use it on my Logo 600 VBAR

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

PM  EMAIL  GALLERY  Attn:RR  Quote
12-10-2011 03:51 AM  5 years agoPost 20
MrNiceGuy

rrVeteran

Melbourne, FL

My Posts: All  Forum  Topic

Have used it on a few different helis and it works well.

Yesterday is History, Tomorrow is a Mystery, Today is a GIFT

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 2839 views
Scorpion Power Scorpion Power
HelicopterFlybarless Rotor Head SystemsV-Bar › Vbar drift left in hover
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Friday, November 17 - 9:30 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online