FIXED - Tail drift in HL !

FredRX · 09-21-2010, 02:54 PM

I have bad tail drift in heading lock mode with my 3G v2.1 mounted on a 700E.
The rudder servo is a DS650.

Any idea to fix this ?

zoomtt · 09-21-2010, 02:59 PM

pad being used?
Strap? not super tight...
Gain on radio?
is it a slow wag drift? or drift only no wag?

mikejr718 · 09-21-2010, 09:29 PM

Mine had a tail drift and tail also kid of wagged. I played around with mounting tape combinations and got rid of all of it. I now use on all my helis a soft double sided tape then a metal plate(spartan makes a good one) then thinner tape and then the sensor. Sometimes a strap and sometimes not. I am a solid believer in the metal plate being used on all helis. When you get it right the heli will be solid but yet will flip in its own length. If the sensor is exposed to to much vibration the heli will fly like cr@p.

FredRX · 09-22-2010, 04:36 AM

Thanks guys.

It is a slow drift with wag actually.

I'm using the Spartan double sided tape + Spartan plate + Align foam then the sensor above this set.
No strap.
My gyro's gain is 57 (within the AVCS upper range, from 50% to 100%). Radio: 12FG.

Smash McCrash · 09-22-2010, 12:45 PM

I have found the same problem with the 3 3G's I have on a 500, 600E, and 700E. I added in some delay and it smoothed it out pretty good. I was also able to up the gain just a touch. Another thing I have been doing is moving the ball in at the servo to run a higher gain to hold the tail a little better. I still have a little wag in a hover, but it's not drifting. I am only using the Align tape (1 or 2 pieces, can't remember) and HK 4mm tape. No strap, no plate. I think the plate may be a good idea though. I just need to make some here at work...

Mike

FredRX · 09-22-2010, 03:02 PM

I don't know how the delay parameter acts actually? Is it something like an adaptation to servo's speed?

Smash McCrash · 09-23-2010, 12:43 PM

I'm not sure exactly what the delay does, but I think it just adds a very short pause to the servo correction to dampen out the wags. All I know is that it helped tame the tail down for me when in a hover, which is the only time I could see anything. In FF everything was good.

Mike

Coolice · 09-27-2010, 03:31 AM

Hey.

Delay is basically used to counteract a slow reacting tail servo, adding delay to the gyro slows the tail correction commands to give the servo a better of keeping up.

If you have the 3G link cable try removing some heading lock gain from the tail, I have a friend who had a similar slow wag and by reducing this parameter it's now gone.
.

FredRX · 09-27-2010, 01:08 PM

Thanks for the explanation guys.
I'll try to reduce the "rudder lock gain" asap.

FredRX · 10-15-2010, 04:07 PM

Just to keep you updated: my tail behaviour is OK now

The solution for me was adding a strap

So, to sum up, my final & working sensor mounting setup is: Spartan double sided tape + Spartan plate + Spartan thin tape and sensor WITH strap.

09-21-2010, 02:54 PM	#1
FredRX Registered Users Join Date: Aug 2009 Location: France	FIXED - Tail drift in HL ! I have bad tail drift in heading lock mode with my 3G v2.1 mounted on a 700E. The rudder servo is a DS650. Any idea to fix this ? Last edited by FredRX; 10-16-2010 at 07:08 AM..

09-21-2010, 02:59 PM	#2
zoomtt Registered Users Join Date: Jan 2010 Location: Corona, CA	pad being used? Strap? not super tight... Gain on radio? is it a slow wag drift? or drift only no wag? __________________ Edsel Labao TEAM HORIZON HOBBY Blade Helicopters - Spektrum - Revolution

09-22-2010, 04:36 AM	#4
FredRX Registered Users Thread Starter Join Date: Aug 2009 Location: France	Thanks guys. It is a slow drift with wag actually. I'm using the Spartan double sided tape + Spartan plate + Align foam then the sensor above this set. No strap. My gyro's gain is 57 (within the AVCS upper range, from 50% to 100%). Radio: 12FG. Last edited by FredRX; 09-27-2010 at 01:09 PM..

09-27-2010, 03:31 AM	#8
Coolice Registered Users Join Date: Jun 2004 Location: Northants, England	Hey. Delay is basically used to counteract a slow reacting tail servo, adding delay to the gyro slows the tail correction commands to give the servo a better of keeping up. If you have the 3G link cable try removing some heading lock gain from the tail, I have a friend who had a similar slow wag and by reducing this parameter it's now gone. . __________________ Ian Contessa Team Robbe SchluterUK / Midland Helicopters / Align To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

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09-21-2010, 09:29 PM	#3
mikejr718 Registered Users Join Date: Feb 2008 Location: Omaha, NE	Mine had a tail drift and tail also kid of wagged. I played around with mounting tape combinations and got rid of all of it. I now use on all my helis a soft double sided tape then a metal plate(spartan makes a good one) then thinner tape and then the sensor. Sometimes a strap and sometimes not. I am a solid believer in the metal plate being used on all helis. When you get it right the heli will be solid but yet will flip in its own length. If the sensor is exposed to to much vibration the heli will fly like cr@p.

09-22-2010, 12:45 PM	#5
Smash McCrash Registered Users Join Date: Jun 2009 Location: So Cal	I have found the same problem with the 3 3G's I have on a 500, 600E, and 700E. I added in some delay and it smoothed it out pretty good. I was also able to up the gain just a touch. Another thing I have been doing is moving the ball in at the servo to run a higher gain to hold the tail a little better. I still have a little wag in a hover, but it's not drifting. I am only using the Align tape (1 or 2 pieces, can't remember) and HK 4mm tape. No strap, no plate. I think the plate may be a good idea though. I just need to make some here at work... Mike

09-22-2010, 03:02 PM	#6
FredRX Registered Users Thread Starter Join Date: Aug 2009 Location: France	I don't know how the delay parameter acts actually? Is it something like an adaptation to servo's speed?

09-23-2010, 12:43 PM	#7
Smash McCrash Registered Users Join Date: Jun 2009 Location: So Cal	I'm not sure exactly what the delay does, but I think it just adds a very short pause to the servo correction to dampen out the wags. All I know is that it helped tame the tail down for me when in a hover, which is the only time I could see anything. In FF everything was good. Mike

09-27-2010, 01:08 PM	#9
FredRX Registered Users Thread Starter Join Date: Aug 2009 Location: France	Thanks for the explanation guys. I'll try to reduce the "rudder lock gain" asap.

10-15-2010, 04:07 PM	#10
FredRX Registered Users Thread Starter Join Date: Aug 2009 Location: France	Just to keep you updated: my tail behaviour is OK now The solution for me was adding a strap So, to sum up, my final & working sensor mounting setup is: Spartan double sided tape + Spartan plate + Spartan thin tape and sensor WITH strap.