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Discussion in 'Radian' started by JY Air, Oct 17, 2012.
Phil your video in Post 121 has disappeared.
How do you mean by "slop"? You mean a gear was stipped?
Also, can we replace gears if this is the issue?
I feel like its a limitation in all servos but less in Freefly servos. The tolerances are tight... any kind of hard landing where the servo may be forced suddenly could cause a little wear on those gears. In my case I believe it happened before I had the gear extenders on. With my extended down tube the adjustable tilt bars only had 1/8 ground clearance. Probably hit the ground a few times and stressed the roll servo.
Well that would likely explain my issue. Just prior to this beginning to occur in my videos, I had the unfortunate experience of the vertical shaft the the roll servo resides on slip out and the entire camera and gimbal tray fell 3 feet onto the grass and it likely jammed the roll servo quite a bit.
New servo arrived today.
Phil, Let me know how that works.
I have not swapped my Roll servo out. It's still the original one from FF when I bought the gimbal.
video is coming up soon with the steadyshot off ,off the sony 730
uploading it now
I'm hoping this is the fix. Trying to fly but I've been busy.
If not the fix maybe we need to meet up.
Per Brad, I switched out the original roll servo for a brand new FF servo. Here's the flight...
OR direct link: http://vimeo.com/58676208
The only mod's I have done are replace half of the 6 month old red o-rings on each dampener with new blue o-rings. Temps are 65degrees F. Wind 1-2 mph. Roll radian gain at 135. Camera was balanced 3 weeks ago, but may need rebalancing after replacing servo. Servo bands appropriately tight and without slack. Shoots a 5d mark 3 with 28mm. FYI, using 3 axis Gimbal.
Primary issue before was a roll shake or what otherwise looked like a delayed correction in the roll radian servo. In a video, you would see the horizon correct and level out but in a delayed manner or timeframe. This would cause a horizon twitch or roll. This was seen mainly when moving left then back towards a right bank roll, or vice versa, even in none aggressive movements. What you can't see in this video is my aggressive rocking left to right at certain times. On the video it rolls, but no where near as bad as it was. When flying one would never be this aggressive during filming purposes.
I am curious about the vibrations at the 1:45 mark.....
I would say this greatly improved the video, almost to the point of the problem being eliminated, leaving only minor tweak and adjustments needed. These adjustments would include double checking the camera balance, perhaps all new o-rings, stiffer gimbal plate, Gyro settings adjusted as well, particularly Gyro D (plan to try settings 12-17 per Adam).
Current Flight settings - MK TOOL and Gyro Settings:
P - 100
I - 120
YAW P - 100
YAW I - 120
Dynamic Stability - 70
ACC/GYRO FAKTOR - 27
ACC/GYRO Comp - 32
Main i - 16
Drift Comp - 0
Gyro Stability - 6
Motor Smooth - 0
Phil perhaps the vibrations are prop wash. Worst vibrations always seem to be in hover or vertical descents due to the dirty air from the props.
Yes, did this on two smaller ships and it made all the differense!
her is the video:
Looks pretty good. Clearly some vibrations taken away with the steadyshot but the roll looks not bad at all.
Here was the BEFORE I changed the roll servo. Watch the shadow compared to the video. You will see the copter roll but there is a latency or lag before the horizon adjusts. This is the "roll twitch" I was speaking of....
So Phil, It sounds like it was a roll servo issue? Nothing else changed except for that?
BTW I can't see your video in the post above. It says nothing is available.
Try this now:
Yeah it looks like the servo greatly cleared things up. Whats your next steps/plans? You going to servo swap or try an all new servo?
Is this the improved shot? or the way it was before?
After servo swap. I have some before's I can post later.
i see you use 135 on gain
try around 125 and see how it goes
There are less micro jitters which is better for sure.
That big lag/wobble on the roll still seems there every time you go sideways and it has to counteract. It does it not smooth at all with a big wobble, otherwise its smoother.
Yes, that roll wobble is what I can't seem to fix. Only other thing would be stiffer gimbal plate. Otherwise I have new blue orings on. I can't see how a stiffer gimbal plate would fix this.
Any other thoughts since I know I have a new servo with realistic radian gains, tight bands and a balance camera?