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Old Jan 31, 2013, 03:41 PM
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Joined Jan 2013
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Servo tail jitter problem

Hi there! And hello! I'm new on the forums.

I've just assembled my tricopter last week and was starting to learn to fly. But since then it has developed a vibration in the tail that I have just this evening isolated to be related to the tail servo. I am aware of the jitter from an unfiltered servo and had set the servo filter setting on the KK2 to 30 as recommended. This issue seems to be unrelated and persisted when I upped that value to 40.

Then I tried disconnecting the servo, and hey presto! The vibration was gone. See the short vid below.

I'm using the BMS-385DMAX Digital Servo (Metal Gear) suggested in the original 2.5 build instructions. Any idea what it could be or what to try next? Thanks!

Tricopter tail jitter when servo connected (0 min 22 sec)
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Old Jan 31, 2013, 03:53 PM
Lets make it remote control!!!
abletowinginc's Avatar
USA, FL, St Augustine
Joined Jun 2009
998 Posts
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Originally Posted by sparklet View Post
The weathers not good, so it's time to make a new folding frame.

That way I will be ready for the long, hot summer I'm sure is coming.

Put it down as it was lunch time and...... looked at it properly for the first time since putting the bits together.

Wow ! I think I have built one of those ghost things that used to chase poor old Pacman around his maze.

Not only that but.... the tri seems to have too many legs
lol it does look like pacman ghost almost.........lookin good
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Old Jan 31, 2013, 03:56 PM
Lets make it remote control!!!
abletowinginc's Avatar
USA, FL, St Augustine
Joined Jun 2009
998 Posts
Quote:
Originally Posted by MadSciStuff View Post
Hi there! And hello! I'm new on the forums.

I've just assembled my tricopter last week and was starting to learn to fly. But since then it has developed a vibration in the tail that I have just this evening isolated to be related to the tail servo. I am aware of the jitter from an unfiltered servo and had set the servo filter setting on the KK2 to 30 as recommended. This issue seems to be unrelated and persisted when I upped that value to 40.

Then I tried disconnecting the servo, and hey presto! The vibration was gone. See the short vid below.

I'm using the BMS-385DMAX Digital Servo (Metal Gear) suggested in the original 2.5 build instructions. Any idea what it could be or what to try next? Thanks!

http://www.youtube.com/watch?v=W084GDEVXmg
honestly i dont see enough jittering to be concerned thats normal for the tail servo to wiggle its responding to the board detecting movement. you can try turning the gain down on the yaw see if that helps you but honestly mine moves and jitters or wiggles little movements.
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Old Jan 31, 2013, 04:36 PM
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Originally Posted by abletowinginc View Post
honestly i dont see enough jittering to be concerned thats normal for the tail servo to wiggle its responding to the board detecting movement. you can try turning the gain down on the yaw see if that helps you but honestly mine moves and jitters or wiggles little movements.
Thank you. Your comment prompted me to test with the tricopter's hull clamped to my workbench to eliminate board movement and the tail arm didn't move at all this time. Chalk one up for newbie obsessing. The thing is that I only began to notice this recently -- probably because I started to get the hang of hovering (still no self levelling until I can upgrade the firmware) and began to look more closely at the copter.

What's the drawback of dialling down the yaw gain? More sluggish yaw response?
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Old Feb 01, 2013, 07:02 AM
Lets make it remote control!!!
abletowinginc's Avatar
USA, FL, St Augustine
Joined Jun 2009
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Quote:
Originally Posted by MadSciStuff View Post
Thank you. Your comment prompted me to test with the tricopter's hull clamped to my workbench to eliminate board movement and the tail arm didn't move at all this time. Chalk one up for newbie obsessing. The thing is that I only began to notice this recently -- probably because I started to get the hang of hovering (still no self levelling until I can upgrade the firmware) and began to look more closely at the copter.

What's the drawback of dialling down the yaw gain? More sluggish yaw response?
no sluggishness just the tail will start to drift not be as locked in.just adjust it until you get it solid but not jerky
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Old Feb 02, 2013, 01:07 PM
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Romania
Joined Jan 2013
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Hello guys ,I'm new on rcgropus.Just finishing buildind a tricopter and i encounter a problem with esc calibration ""Throttle pass-through"" mesage on kk2 board.
Using a kk2 board 1,5 fw version , 20A esc flashed with simonk , 750kv motors.
I read kk2 manual and install everything in order and the same with esc calibration.My motors won`t start after arming the board.Any ideas?
Pics :


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Old Feb 03, 2013, 03:07 PM
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Baton Rouge, LA, USA
Joined Dec 2001
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Tri-copter that is an airplane

Tri-copter that is an airplane

Full VTOL with transition and back (1 min 26 sec)
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Old Feb 03, 2013, 05:45 PM
Lets make it remote control!!!
abletowinginc's Avatar
USA, FL, St Augustine
Joined Jun 2009
998 Posts
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Originally Posted by blackwind_ro View Post
Hello guys ,I'm new on rcgropus.Just finishing buildind a tricopter and i encounter a problem with esc calibration ""Throttle pass-through"" mesage on kk2 board.
Using a kk2 board 1,5 fw version , 20A esc flashed with simonk , 750kv motors.
I read kk2 manual and install everything in order and the same with esc calibration.My motors won`t start after arming the board.Any ideas?
Pics :


i had same issue andhad to set the max throttle and minimum throttle one esc at a time for some reson. just unplugged all of them and plugged one ata time into reciever directly to set the throttle range then it solved the issue ur having
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Old Feb 03, 2013, 05:47 PM
Lets make it remote control!!!
abletowinginc's Avatar
USA, FL, St Augustine
Joined Jun 2009
998 Posts
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Originally Posted by EddieWeeks View Post
Tri-copter that is an airplane

https://www.youtube.com/watch?v=qo7hvBXKqto
very cool.....interesting way to get around all the issues many have building a vtol.....different but works well
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Old Feb 04, 2013, 08:40 AM
Flying a Chipmunk in Portugal
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Joined Sep 2010
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Quote:
Originally Posted by EddieWeeks View Post
Tri-copter that is an airplane

https://www.youtube.com/watch?v=qo7hvBXKqto
Nice.. I would like to follow this project.. link?
Question, the tricopter motors don't stop after the transition?
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Old Feb 04, 2013, 12:56 PM
Lets make it remote control!!!
abletowinginc's Avatar
USA, FL, St Augustine
Joined Jun 2009
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Originally Posted by jhsa View Post
Nice.. I would like to follow this project.. link?
Question, the tricopter motors don't stop after the transition?
from what i seen they continued spinning....
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Old Feb 05, 2013, 03:45 PM
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Baton Rouge, LA, USA
Joined Dec 2001
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the tri-copter motors can be shut down in forward flight and all is well...
we did not allways shut them down...

The APM 2.5 disarms the copter after a short time... its not easy to hold full right rudder for 5 sec while flying that thing...

Build thread... ummm... that plane was built in 2-3 hours.. flown for the day.. then ended up and the top of a 40 foot tree stuck... we got it down but it died when it hit the ground..LOL...

Working on a new one with only 3 motors that all rotate 90 deg...
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Old Feb 05, 2013, 10:02 PM
Flying a Chipmunk in Portugal
jhsa's Avatar
NRW, Germany
Joined Sep 2010
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Quote:
Originally Posted by EddieWeeks View Post

The APM 2.5 disarms the copter after a short time... its not easy to hold full right rudder for 5 sec while flying that thing...
Multiwwi can use a switch to arm/disarm the motors.. very nice project anyway. been thinking of something like this for a while.. actually, this was the reason I got into multirotors in first place..
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Old Feb 15, 2013, 08:20 PM
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Have we finally reached the end of this thread sign guy ?
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Old Feb 15, 2013, 08:33 PM
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I doubt it. Something new always comes about. That's the way of the thread.
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