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HomeAircraftHelicopterHelicopter Main Discussion › Spartan gyro tail drift
04-26-2009 02:23 PM  9 years agoPost 1
rotorstart

rrApprentice

USA

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Something weird happened yesterday when I was at the field.

I set up a small angle for the tail to counter the heli spinning main blades direction. That's fine in NOR, but as I turn to AVC, the servo slowly moves the tail slider to the right (looking from behind). As a result, during flight, if I switch to AVC, I have to constantly apply "right" rudder stick because the heli would turn to the left.

Any idea what would cause this? The previous flights (same day) were all fine and tail was rock solid.

Trex-600ESP stock, Spartan gyro with S9251, TP6s5000.

Thanks in advance.

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04-26-2009 03:07 PM  9 years agoPost 2
duceduc

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Saitama-Ken, Japan

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check to might sure the trim for the rudder is center and no sub trim are set.

Duc S
Do It! Do It!™
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04-26-2009 03:19 PM  9 years agoPost 3
Steff Giguere

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St-Eustache, Quebec, Canada

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+ 1

Team Synergy, Rail blades, Team Scorpion, V-Team

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04-26-2009 05:07 PM  9 years agoPost 4
cmsilvoy

rrKey Veteran

Durham, NC

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Make sure the trims are at zero....
And do the set up routine over again.

Your problems should be solved!

Chris

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04-26-2009 05:09 PM  9 years agoPost 5
rotorstart

rrApprentice

USA

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OK, I modified the topic to reflect the real issue. I did have sub trim at the field because I got some tail drift only on high headspeed, hence the tail servo movement as my first post. After removing the sub trim, it no longer had that issue. Back to my original issue.

I recently had this slow counter clockwise tail drift. Per suggestion from other people on the board here, I just set it up so the tail slider is right at the middle and no bind both ways. There is no angle for the tail blades and I saw that the blue light on the Spartan was on. I didn't have this issue before though, just very recently.

The tail drift only exists in high HS in idle-up. In low HS (normal), the tail locks in fine. This is the same in both NOR and AVC. My gain is currently 30% for both sides, but I tried different numbers and no help.

Inputs please

Thank you all for your inputs so far.

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04-26-2009 06:03 PM  9 years agoPost 6
Barney

rrKey Veteran

Inverness Scotland

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If its fine at a lower headspeed there are two possibiles.

Most Radio's allow independant trim setting in each flight mode. i.e Normal Idle 1/2/Hold.

You need to ensure there is no trim in all[I] Flight modes

If its not the above its likely you have a vibration issue.

cheers Brian

SPARTANRC Team pilot

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04-26-2009 06:33 PM  9 years agoPost 7
rotorstart

rrApprentice

USA

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I took it to the backyard and tried again, still the same counter-clockwise drift on idle up.

No trim in all flight modes. If there's any vibration, I can't see it. I paid close attention to the heli in my latest test and couldn't find any vibration at all. I must be missing something.

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04-26-2009 06:35 PM  9 years agoPost 8
raptorheli2

rrElite Veteran

rip off britain and no changing it

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drifting to left as you say is 99.999999999999% of the time a vibration problem.

you could try remounting the gyro (or try a thinner pad, use the metal plate if your not now), make sure the gyro wire is not being pulled, check tail bearings, everything running smoothly.

cheers


www.waterfoothelis.com

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05-08-2009 06:44 AM  9 years agoPost 9
Sam2b

rrElite Veteran

Tacoma, WA

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The tail drift only exists in high HS in idle-up
Rotorstart, a few thoughts:

Please remove the boom and verify the torque tube bearing is in the correct position and off set as per the manual. Secure the bearing how ever you see fit so it does not slide up or down the boom internally.

Install the boom and remove the tail assembly from the boom. Slowly spin the main rotor and see if the torque tube turns true with no wobble. If there is a wobble consider replacing the torque tube.

Was this heli ever in a crash? Was the tail rotor shaft replaced after the last crash (minor or major crash)? If, not replace it.

Are you using a set of tail blades that came from the same package, and not two tail blades from different packages of blades? I recommend using a package of blades with the hopes they are matched or balanced.

Did you mount the Spartan Gyro as per the manual and using the specific mounting foam adhesive square? Mount the foam square to the frame, then the metal plate, then the white thin adhesive tape, then the gyro. The metal plate actually helps with vibration attenuation with this gyro (as per the manual).

Are you using a strap of any kind to secure the gyro? If so, remove it temporarily and test fly the heli. If you take the time to clean all surfaces two times with rubbing alcohol and a paper towel the foam adhesive pads will stick for about 30 years. After 30 years you may want to change the foam pads.

Also make sure nothing is touching the gyro wire for at least 2" from the gyro itself. The manual states this as well.

Remember there are four flight modes that could have left rudder trim: normal mode, stunt 1, stunt 2, and throttle hold. Zero them all out along with sub trim. Then rebind your receiver with the transmitter if using a 2.4GHz system.

There are even more factors to consider, but these are biggies I always cross off my check list and I've never had an issue with tail drift once I ensure all of these are checked.

_Sam B_

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05-08-2009 09:21 AM  9 years agoPost 10
JetFire

rrKey Veteran

The Golden STATE

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I'm taking a shot in the dark, but there is also a possibility that your headspeed is to slow resulting in poor tail autority. Bump your headspeed up in that particular mode and verify if the problem persists. More and likely this isn't the case because its to my understanding that your getting a tail creep on the bench but its worth a try. There is also a possibility that you don't have the right servo selection (frame rate) during your initial setup. This will cause the servo to not function correctly if at all.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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05-18-2009 11:38 PM  9 years agoPost 11
Sam2b

rrElite Veteran

Tacoma, WA

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I had tail drift with my Spartan DS760 this weekend for the first time in a hover. I forgot to reconnect the muffler pressure line. This resulted in the engine running inconsistently. I would have expected a small oscillation, but rather it drifted counter clockwise (to the right). Interesting result. Maybe this will help someone in their process of elimination. My problem was solved with engine tuning.

_Sam B_

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05-19-2009 12:43 AM  9 years agoPost 12
Elgreco

rrVeteran

Montreal,QC-Canada

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Had the same issue (Look Spartan drift thread in corresponding gyro section)

Finally it was a vibration issue. I just came back from the field once I fixed it and spartan locks in fine...

I had not balanced my fan and clutch and that was causing the vibration.

If you were running fine before, maybe something else came loose. Check for vibes..

Trex 550 V-BAR, Trex 700 V-BAR, N5-os55VBAR, TREX700E V-BAR /X9503

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05-19-2009 05:06 AM  9 years agoPost 13
Micro-Maniac

rrElite Veteran

Pasco,Washington Formerly: Captain Chaos

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Sounds like a vibe issue to me as well - I had the same issue on my 450 - I thought it was running smooth but better gyro tape cured my slow drift

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