Code: Select all
ffmpeg -i 20180710191321.mp4 -vcodec copy -an tree_hang.mp4
From previous posting we know that E52 can lift with 14.6g backpack easily, from today we know it cannot lift with more than 25g additional load.This drone can carry even more easily ...
The ordered E52 drone arrived in Germany during my vacation, but not at home. Instead it was held in customs office in Heidelberg and I got mail that I had to show printed invoice to get it (17.06€ or 19.51$ is quite less than the price I would have to pay tax). I knew the procedure as last year a cheap caterpillar robot was held there as well:HermannSW wrote: ↑Thu Jul 12, 2018 7:27 am...
I did order a backup E52 yesterday, for some reason it was cheaper than even during super sale last time (20$):
https://twitter.com/HermannSW/status/10 ... 0398379008
Unfortunately today it is at 29$ again.
I was lucky on last Sunday recce flight with drone, drone should not be above trees when lipo is drained. After 5 long seconds of drone fall through 10m high tree it ended up on ground without any issues:
I thought of similar, connecting my two planes horizontally. Have not tried yet.I wonder if you could bind 2 panes together vertically and make a sort of biplane to get more lifting capability.
I know, and even better with ffmpeg.Oh, and you can make animated gifs with gifsicle in the Raspbian debs.
No, it needs to be vertically, at least for what I'm thinking of. Not even another plane but another wing. https://en.wikipedia.org/wiki/Lift_(force) My father used to make boomerangs by cutting them out of plywood and sanding the leading and trailing edges by eye. I've made windmill blades (which have a lift pointing downwind) by using a spreadsheet.
I did buy a digital laser photo tachometer for less than 8$, and it did travel from China to Germany in 19 days only:HermannSW wrote: ↑Thu May 24, 2018 5:41 pm...
So here after 3 frames the "same" scene appears again. I wanted to be sure and used 640x150_s tool that records every other line/column only and therefore captures with 1007fps as well. Because of the different "capturing position/time after framestart" pair this video is much better to see that indeed the propeller moves 1/3rd of a round per frame (coarser in both directions, but the 640x150 frame shown correctly represents the 640x150 from camera fov covered):
So now we can do the math and see more than 20,000rpm for the propeller:
Code: Select all
$ bc -ql 1007/3 335.66666666666666666666 1007/3*60 20139.99999999999999999960
Just in case my interpretation is wrong and the propeller does not 1/3rd of a round per frame, but 4/3rd, then propeller rpm would be 80,000
People have stretched this concept to the limit !