Possible solution to getting Jello Free GoPro Hero 3 Black Edition video on multicopters

I'm sure everyone who is into aerial videgography with the wonderful GoPros have struggled with getting Jello Free (rolling shutter) video footage from multicopters. I have tried them all. Using ND filters to lower the shutter speed of the GoPro (worked somewhat but ruined image quality), shot in 720p @60fps but would have preferred shooting in full HD. Tried all sorts of foam and vibration absorption materials, ear plugs, rubber foam mounts, hours balancing my propellers and laser mirror and phone seismograph app to iron out any vibrations to no avail. Despite the GoPro Hero 3 B.E. shooting at full HD @ 60fps, I still get some rolling shutter. 

Recently I saw this video by Matt Hall who's Tcopter design GoPro video footage is devoid of any rolling shutter effect. I followed the hardware specs recommendations, using 1400kv SunnySky motors and Simon K'd F30a ESCs. I took his frame design and modified it a little and used a cradled motor yaw mechanism inspired by this design. And this is the result, below is a conceptual design I created in Blender 3D to test out the yaw mechanism and also to get the dimensions.

Here is the Actual Craft built last Friday.

And here's the video. I believe the wooden frame, small high speed manually balanced GWS style HK propellers (8x4) combined with the high KV rating of the motors (1400) helped to generate very high vibration frequencies that is not noticeable on the GoPro Hero 3 B.E. CMOS sensor. All my previous multicopters motors are rated at 750kv and below spinning 11 inch props. Balancing them, especially the 11x47 Gemfans are a nightmare, so it was very difficult for me to get perfectly balanced setup and that resulted in rolling shutter. So the key I discovered is, use high KV motors rated 1K and above and also high speed smaller props. There is a catch however, flight times are reduced as this setup is not as efficient as the lower KV motors, but I think this is a small trade off for the footage I'm able to get. Right now on a 2200mah 4S Nanotech LiPo, I get around 7minutes flight time. All up weight with Camera and Battery is 1.3kg or nearly 3 pounds.

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Comment by weelian soh on February 27, 2013 at 7:01am

My latest flight. Brought down the stick scaling of the KK2 board for a smoother flight.


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