Russian Postal Service's UAV Crashes During Its First Flight
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Hey, why not try ROCKET MAIL?
[video=youtube;pRjWpdZVsV8]https://www.youtube.com/watch?v=pRjWpdZVsV8[/video]
BTW - here is a different video of the multicopter crash. Not as slick but far more informative.
You can hear a LOT of wind noise. I suspect the big box under it added so much extra drag for horizontal flight that as it tried to fly forward to fight the wind, it became uncontrollable.
I figure that they scheduled this public demonstration flight and felt too much pressure to delay it when the wind was too strong. Learning two things the HARD way:
1- Delay of a public event is bad, Total Disaster is FAR WORSE (Challenger shuttle accident).
2 - Test fly in all conditions that the vehicle/model is supposed to be operational. I suspect they never test flew it (with that box attached anyway) in 30-50 mph (whatever) winds, because........... it would be too risky.
[video=youtube;k20zAeRhCgw]https://www.youtube.com/watch?v=k20zAeRhCgw[/video]
[video=youtube;pRjWpdZVsV8]https://www.youtube.com/watch?v=pRjWpdZVsV8[/video]
BTW - here is a different video of the multicopter crash. Not as slick but far more informative.
You can hear a LOT of wind noise. I suspect the big box under it added so much extra drag for horizontal flight that as it tried to fly forward to fight the wind, it became uncontrollable.
I figure that they scheduled this public demonstration flight and felt too much pressure to delay it when the wind was too strong. Learning two things the HARD way:
1- Delay of a public event is bad, Total Disaster is FAR WORSE (Challenger shuttle accident).
2 - Test fly in all conditions that the vehicle/model is supposed to be operational. I suspect they never test flew it (with that box attached anyway) in 30-50 mph (whatever) winds, because........... it would be too risky.
[video=youtube;k20zAeRhCgw]https://www.youtube.com/watch?v=k20zAeRhCgw[/video]
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If you slow the video down to .25 speed, around 10 seconds in, you can see what appears to be one of the arms of the multi-copter break off. At first I thought it was a bird or something flying by but presentably this arm also had one of the motors attached. If so it makes sense because it was immediately following this that it lost complete control. Not knowing that much about these aircraft I was under the impression that one of the reasons for "Multi" was to mitigate the impact on control if you have a failure.
Scratch that it may have just been a bird of something fly by as you can clearly see all 6 arms in the video right up to the point where it hit the wall.
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