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Old Jul 27, 2012, 09:58 PM
Gary
glmccready's Avatar
United States, MD, Salisbury
Joined Mar 2011
2,414 Posts
Brian: yea I have the GPS shield on both MK machines. It works on both but on the rusty qaud is is just not nearly as good as on the CS6 where I mounted the navi and GPS on the arm.
And yep I got the GPS with the Naza, but too busy to put everything together. I did notice that the Naza has a feature where you can tell it where the GPS is from the center of gravity. Would be nice if the MK had that. When I do a spin place with the CS6, with AH and PH on, ( with the GPS on the arm) it spins around the GPS and not the center of the copter.
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Old Jul 28, 2012, 01:40 AM
Registered User
Moscow, Russia
Joined Feb 2009
276 Posts
Quote:
Originally Posted by dmsgodeep View Post
Great video Andrei.
What gimbal control system are you using?

Brent
Now we are using HoverFly Gimbal with AV200 - very stable and really working gimbal control. Now this system hasn't normally working pan stabilization, but roll and tilt work really fine - without temperature drift (like Picloc)

Best regards,

Andrei
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Old Jul 28, 2012, 09:00 AM
OCD
Wright's Avatar
King, NC
Joined Aug 2000
487 Posts
Throttle

Hey guys,

Do you ever use throttle curves? I have noticed when landing our octaXL with a SLR camera one click on throttle has a large effect on altitude. This makes for some tense moments on landing!!! Just wondering how you guys handle landing loaded copters.

Marcus
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Old Jul 28, 2012, 10:39 AM
Gary
glmccready's Avatar
United States, MD, Salisbury
Joined Mar 2011
2,414 Posts
Wright: I use throttle curve since my birds (quad and CS6) don't really take off till about 40-45% throttle. I adjusted it so I could have smoother landings and better hover control. But I have DX8 and the throttle is smooth, no clicks.
BTW: I'm heading to Winston-Salem tomorrow to tour some vineyards with "she who must be obeyed" for 4 days. Can you pvt message me with some recommendations re. vineyards and restaurants? Thanks, Gary
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Old Jul 28, 2012, 03:13 PM
OCD
Wright's Avatar
King, NC
Joined Aug 2000
487 Posts
Quote:
Originally Posted by glmccready View Post
Wright: I use throttle curve since my birds (quad and CS6) don't really take off till about 40-45% throttle. I adjusted it so I could have smoother landings and better hover control. But I have DX8 and the throttle is smooth, no clicks.
BTW: I'm heading to Winston-Salem tomorrow to tour some vineyards with "she who must be obeyed" for 4 days. Can you pvt message me with some recommendations re. vineyards and restaurants? Thanks, Gary
Sent you some places to try. Thanks the throttle info. Thought it would have to help. Marcus
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Old Jul 28, 2012, 04:03 PM
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Denmark, Capital Region of Denmark, Copenhagen
Joined May 2010
1,184 Posts
Quote:
Originally Posted by Wright View Post
Hey guys,

Do you ever use throttle curves? I have noticed when landing our octaXL with a SLR camera one click on throttle has a large effect on altitude. This makes for some tense moments on landing!!! Just wondering how you guys handle landing loaded copters.

Marcus
I use it with great success. But it takes a combination of stuff to do right.

First, make your MK hover at ~127 (midstick) using the BL option PWM scaling (http://mikrokopter.de/ucwiki/en/BL-C...he_parameters:)

After that, just do a slight s-curve around the center in your tx. Works really well for me.
To make it makes sense to make the area around center stick less sensitive (thus, more precise input is easier). I'm not really using the otherwise large motion-range of the stick.
It is a bit scary when throttling up from min-gas, as the it will go through the buttom throttle range very quickly, but once it's up, it's very smooth around hover.

Also remember to do some expo on your ail and ele channels.

Oh, and if your payload changes, you only need to change the PWM scaling, nothing else.
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Old Jul 28, 2012, 11:22 PM
Registered User
Austin, Texas
Joined Apr 2009
499 Posts
Quote:
Originally Posted by AndrKolom View Post
Now we are using HoverFly Gimbal with AV200 - very stable and really working gimbal control. Now this system hasn't normally working pan stabilization, but roll and tilt work really fine - without temperature drift (like Picloc)

Best regards,

Andrei
I've heard good things about the Hoverfly controller. I am just starting to think maybe the MK controlling the tilt and roll servos isn't the best. I'm still getting twitching in my mount and I'm thinking now maybe it's coming from the flight controller as opposed to my mount being bad. I'm not sure.
Were you having trouble getting smooth controls from the MK servo outputs?

A friend has the same mount I have basically and his video is smooth. The difference is he is running the Wookong flight controller.

Not sure if I would be better off getting the Hoverfly and bypassing the MK.

Brent
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Old Jul 28, 2012, 11:58 PM
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pootman's Avatar
Goleta, CA
Joined Mar 2006
757 Posts
I'm also throwing around the idea of using an external gimbal controller. Is it possible to control tilt through the tx using the hoverfly gimbal controller?
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Old Jul 29, 2012, 08:44 AM
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Moscow, Russia
Joined Feb 2009
276 Posts
Quote:
Originally Posted by pootman View Post
I'm also throwing around the idea of using an external gimbal controller. Is it possible to control tilt through the tx using the hoverfly gimbal controller?
Yes, we have tilt and pan RC control from independent TX for our rotatable gimbal.
Our video with original music on Vimeo:


Fishing Day On Finland Lake from Hexacopter board on Canon 5D Mark II (multicopter.ru) (4 min 52 sec)


Best regards,

Andrei
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Old Jul 29, 2012, 03:39 PM
Registered User
Austin, Texas
Joined Apr 2009
499 Posts
Octo twitch

My octo twitches when in fast forward flight and/or high winds.
You can hear the motors make sort of a chirping noise when it twitches. It flies perfectly fine in calmer weather and slower forward flight.

My thoughts are that it could possibly be some vibrations getting to the FC that are causing the accelerometers and/or gyros to freak out and send this twitching to the motors. Maybe the vibration only presents itself when in higher winds?
Other than that...I'm at a loss.
My PIDS are:
P=85
I=126
D=15
Handles great with these settings except for the twitching.

Tried the following to see if it still twitched and it does.
P=100
I=75
D=10
Since it still twitches in fast forward flight with these drastically different PIDS...it makes me think it's not PIDS causing this. maybe some other setting?

I really don't know.
Looking for suggestions.

Edit: I changed gyro comp to 32 to reduce the acc vibration effect and I double checked all props for vibration. No change.
No matter what settings I try...it still makes the chirping noise (not from the buzzer, but from the motors) and twitches during fast forward flight.

Thanks.
Brent
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Old Jul 30, 2012, 02:10 AM
Registered User
Moscow, Russia
Joined Feb 2009
276 Posts
Quote:
Originally Posted by dmsgodeep View Post
My octo twitches when in fast forward flight and/or high winds.
You can hear the motors make sort of a chirping noise when it twitches. It flies perfectly fine in calmer weather and slower forward flight.

My thoughts are that it could possibly be some vibrations getting to the FC that are causing the accelerometers and/or gyros to freak out and send this twitching to the motors. Maybe the vibration only presents itself when in higher winds?
Other than that...I'm at a loss.
My PIDS are:
P=85
I=126
D=15
Handles great with these settings except for the twitching.

Tried the following to see if it still twitched and it does.
P=100
I=75
D=10
Since it still twitches in fast forward flight with these drastically different PIDS...it makes me think it's not PIDS causing this. maybe some other setting?

I really don't know.
Looking for suggestions.

Edit: I changed gyro comp to 32 to reduce the acc vibration effect and I double checked all props for vibration. No change.
No matter what settings I try...it still makes the chirping noise (not from the buzzer, but from the motors) and twitches during fast forward flight.

Thanks.
Brent
Brent! I'm using PID=136, 120, 14 - some time ago Simon suggested to use this parameters. All other parameters - default. Gyro stability not high as 6 - try to play with.

Best regards,

Andrei
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Old Jul 30, 2012, 05:47 AM
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dragant's Avatar
Belgrade, Serbia
Joined May 2010
467 Posts
Quote:
Originally Posted by dmsgodeep View Post
My octo twitches when in fast forward flight and/or high winds.
You can hear the motors make sort of a chirping noise when it twitches. It flies perfectly fine in calmer weather and slower forward flight.
Do you have Navi board or just FC?
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Old Jul 30, 2012, 11:42 AM
Registered User
Austin, Texas
Joined Apr 2009
499 Posts
Quote:
Originally Posted by AndrKolom View Post
Brent! I'm using PID=136, 120, 14 - some time ago Simon suggested to use this parameters. All other parameters - default. Gyro stability not high as 6 - try to play with.

Best regards,

Andrei
Thanks Andrei, I will try those PIDS.
What motors are you running?


Quote:
Originally Posted by dragant View Post
Do you have Navi board or just FC?
Yes...with Navi.


Anyone have a good suggestion on motors? I've been running the Turnigy 2217/20 for 3 years and they have served me well. But now I want to run 12" props and they won't handle it. I thought about the Avrotos but would rather not spend $60/motor. Also...the last batch I bought, 4 out of 6 had bad bearings. Absolutely unacceptable when spending that much per motor.
Someone mentioned Sunnysky motors, but I can't find them in stock. I'm thinking about a 700 - 900 kv rating for this sized prop. Is that about right? Any suggestions on motors would be appreciated.

Anyone have experience with this motor?

Thanks.
Brent
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Old Jul 30, 2012, 12:58 PM
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va3mw's Avatar
Joined Sep 2008
705 Posts
For you guys with stability problems, have you taken the time to actually tune your PIDs rather than guessing at them?

No 2 MKs at the same for the most part. Different weights, radius, props, etc. will always provide different results.

I changed from my APC 11x4.7s to Graupner 11x5's (the Graupners are heavier much to my surprise). I had to retune my Y6 to the new props.

Tuning your PIDs is well described in the Wiki. You then need to adjust the PIDs for the GPS. If you don't, you will have the toilet bowel affect.

I suspect that every other vendor has the same problem, it is that they are selling a complete solution that is pre-tuned for what they are selling.

Take the time to Tune your PIDs. The difference is amazing. If you have tuned your PIDs and then still have a problem, then lets work through it.

http://www.mikrokopter.de/ucwiki/en/MKTools-Setup

BTW, a few weeks back, the person that crashed with GPS hold on and not manual, that might have been related to being between 2 buildings with the MK. GPS signals to reflecting off the buildings causing your location to jump around.

To see what I mean, drive through any city with tall buildings and watch your car GPS move you from 1 block to the next.

Mike
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Old Jul 31, 2012, 04:00 AM
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Moscow, Russia
Joined Feb 2009
276 Posts
Quote:
Originally Posted by dmsgodeep View Post
Thanks Andrei, I will try those PIDS.
What motors are you running?
I'm using AXI 2814/22 and 2826/12.
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