Weird 450x Tail Vibration/Oscillation - Page 2

meatwad99si · 04-10-2012, 09:03 PM

Its not lazy gyro wag its crazy freakout wag...

DoctorJ · 04-10-2012, 09:07 PM

Turn down your cyclic gain if it is not at 12 o'clock.

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tamupino · 04-10-2012, 09:54 PM

I tried adjusting cyclic gain per your suggestion with no luck

. Goes into crazy tail shudder mode with sudden control inputs.

DoctorJ · 04-10-2012, 10:37 PM

Can you put your gyro into rate mode by reducing gyro gain almost all the way and see what happens. The will help diagnose

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azezeil · 04-14-2012, 02:38 PM

Well guys...I figured it out. I did some trouble shooting with the tail and when they assembled them at the factory they must have not torqued the screws enough on the plastic mounts. Whats happening is under heavy load the servo mount is pushing up and twisting the servo rod. I noticed this first because I did some extreme pitch pumps for about 10 seconds then brought her down and gave her a once over. Noticed the rod was bent, straightened it back out, and tried again. Same thing, so I torqued the screws to the point where I was afraid of stripping the plastic and it fixed it.

I have the aluminum mounts on their way so I'll be swapping them in along with my H5020G servo, but I'm glad that it was something so simple. Just annoyed it took me this long to finally get some free time to really dig into it.

meatwad99si · 04-14-2012, 10:26 PM

Hmm thats interesting ill have to make sure, i tighten mine up.

Talesin · 04-16-2012, 02:41 AM

Interesting. Mine were flexing more just before my (I /think/ unrelated) crash, and got the crazy tail-wag two or three times (very visible on the video). Ordered the aluminum mounts since the tail had to come off anyway.

meatwad99si · 04-16-2012, 03:22 AM

Quote:

Originally Posted by Talesin

Interesting. Mine were flexing more just before my (I /think/ unrelated) crash, and got the crazy tail-wag two or three times (very visible on the video). Ordered the aluminum mounts since the tail had to come off anyway.

Do the aluminum mounts hold tighter? Im prob gonna get some when i get my mks servos.

Talesin · 04-16-2012, 04:02 AM

Yeah. There's no flex like the plastic ones, and even pressing *hard* with a thumb, with the screws only lightly tightened they don't seem to move at all; much less tightening them down solid.

meatwad99si · 04-16-2012, 03:50 PM

yeah it seems like once you move the servo mounts or pushrod guides from there stock locations they never hold the same...

krante · 09-07-2012, 06:09 PM

Quote:

Originally Posted by azezeil

Well guys...I figured it out. I did some trouble shooting with the tail and when they assembled them at the factory they must have not torqued the screws enough on the plastic mounts. Whats happening is under heavy load the servo mount is pushing up and twisting the servo rod. I noticed this first because I did some extreme pitch pumps for about 10 seconds then brought her down and gave her a once over. Noticed the rod was bent, straightened it back out, and tried again. Same thing, so I torqued the screws to the point where I was afraid of stripping the plastic and it fixed it.

I have the aluminum mounts on their way so I'll be swapping them in along with my H5020G servo, but I'm glad that it was something so simple. Just annoyed it took me this long to finally get some free time to really dig into it.

I there, I get this very issue when I stick rudder all the way to the left or right for multiple pirouettes. The tail vibrates violently that I had to land quickly. I don't quite follow your solution described above, any chance of a picture please?
First time I had this issue, I thought it was a bad tail servo so swapped it out to MKS DS95i but it did not fix the problem.
Any help will be much appreciated.

DK

Coco66 · 09-08-2012, 04:37 PM

Quote:

Originally Posted by krante

I there, I get this very issue when I stick rudder all the way to the left or right for multiple pirouettes. The tail vibrates violently that I had to land quickly. I don't quite follow your solution described above, any chance of a picture please?
First time I had this issue, I thought it was a bad tail servo so swapped it out to MKS DS95i but it did not fix the problem.
Any help will be much appreciated.

DK

From what I understand, azezeil was tightening the screws which fix the two plastic tail servo mounts to the boom.

AZHELIMEDIC · 09-09-2012, 04:45 PM

Mine did the same exact thing when I put on the kbdd 62mm tail blades. As soon as I put stockers back on problem was solved.

04-10-2012, 09:07 PM	#22
DoctorJ Registered Users Join Date: Oct 2010 Location: Sandy, Oregon	Turn down your cyclic gain if it is not at 12 o'clock. Sent from my iPhone using Tapatalk __________________ Goblin 700 - XF495 KDE - HC3SX - CC160 Trex 700 - 700 MX - HC3SX - CC120 Blade 450X - Scorpion 2221-6 - CC 50 Blade 130x - HP08 - CC ( many others )

04-10-2012, 10:37 PM	#24
DoctorJ Registered Users Join Date: Oct 2010 Location: Sandy, Oregon	Can you put your gyro into rate mode by reducing gyro gain almost all the way and see what happens. The will help diagnose Sent from my iPhone using Tapatalk __________________ Goblin 700 - XF495 KDE - HC3SX - CC160 Trex 700 - 700 MX - HC3SX - CC120 Blade 450X - Scorpion 2221-6 - CC 50 Blade 130x - HP08 - CC ( many others )

04-16-2012, 02:41 AM	#27
Talesin Registered Users My HF Map location Join Date: Jan 2012 Location: Kansas City, MO	Interesting. Mine were flexing more just before my (I /think/ unrelated) crash, and got the crazy tail-wag two or three times (very visible on the video). Ordered the aluminum mounts since the tail had to come off anyway. __________________ *Blade*: mCX2, mSR, mSRX, Nano-CPX, 2x mCPX (v1), mCPX-BL, 120SR, 450 X Spektrum DX8, DX6i

04-16-2012, 04:02 AM	#29
Talesin Registered Users My HF Map location Join Date: Jan 2012 Location: Kansas City, MO	Yeah. There's no flex like the plastic ones, and even pressing hard with a thumb, with the screws only lightly tightened they don't seem to move at all; much less tightening them down solid. __________________ *Blade*: mCX2, mSR, mSRX, Nano-CPX, 2x mCPX (v1), mCPX-BL, 120SR, 450 X Spektrum DX8, DX6i

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04-10-2012, 09:03 PM	#21
meatwad99si Automotive technician - but really a rocket scientist Join Date: Mar 2012 Location: Mesa Arizona - Tough Guy Poser	Its not lazy gyro wag its crazy freakout wag...

04-10-2012, 09:54 PM	#23
tamupino Registered Users Join Date: Jan 2012 Location: Texas	I tried adjusting cyclic gain per your suggestion with no luck . Goes into crazy tail shudder mode with sudden control inputs.

04-14-2012, 02:38 PM	#25
azezeil Registered Users Join Date: Feb 2012 Location: United States	Well guys...I figured it out. I did some trouble shooting with the tail and when they assembled them at the factory they must have not torqued the screws enough on the plastic mounts. Whats happening is under heavy load the servo mount is pushing up and twisting the servo rod. I noticed this first because I did some extreme pitch pumps for about 10 seconds then brought her down and gave her a once over. Noticed the rod was bent, straightened it back out, and tried again. Same thing, so I torqued the screws to the point where I was afraid of stripping the plastic and it fixed it. I have the aluminum mounts on their way so I'll be swapping them in along with my H5020G servo, but I'm glad that it was something so simple. Just annoyed it took me this long to finally get some free time to really dig into it.

04-14-2012, 10:26 PM	#26
meatwad99si Automotive technician - but really a rocket scientist Join Date: Mar 2012 Location: Mesa Arizona - Tough Guy Poser	Hmm thats interesting ill have to make sure, i tighten mine up.

04-16-2012, 03:50 PM	#30
meatwad99si Automotive technician - but really a rocket scientist Join Date: Mar 2012 Location: Mesa Arizona - Tough Guy Poser	yeah it seems like once you move the servo mounts or pushrod guides from there stock locations they never hold the same...

09-09-2012, 04:45 PM	#33
AZHELIMEDIC Registered Users Join Date: Aug 2012 Location: Peoria AZ	Mine did the same exact thing when I put on the kbdd 62mm tail blades. As soon as I put stockers back on problem was solved.