Replies to This Discussion

Permalink Reply by Michael Pursifull on November 19, 2011 at 2:31pm

Get good lawyer. You'll want him to review the life insurance policy to be sure it covers this unique form of insanity.

Then build an normal sized arducopter so you can see how fast they flip and drill into the ground, so you can see exactly how it will kill you before the blades shred what's left of your squashed corpse.

Or you can talk to the guys who built it. At least one of these crazy guys are here on diydrones ;-)

I still recommend getting the lawyer to review your life insurance policy. And getting arducopter so you Can have fun before you become paste.

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Permalink Reply by Danny Lombard on November 19, 2011 at 9:54pm

I was thinking there would be some mincing present.

will the amount of blades would offer some stabality?
Maybe have the passenger sitting under the blades.

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Permalink Reply by Michael Pursifull on November 19, 2011 at 11:55pm

The truth is that these guys know more about multicopters than I ever will. That does not change the fact that, in my mind, the moment I saw this I greatly feared for the test pilot's safety, and those around him. If mistakes with a small quad result in terrific hand injuries, a mistake with this can easily be fatal. And to the pilot, I worried mores because there is no roll cage to protect his back and neck. The weight is a challenge,  I am sure, but too often I have seen a multicopter fail and flip, and when it happens, it often accelerates into the ground very quickly, as the forces which are meant to keep it upright instead join with gravity. 

 

Many systems can suffer cascading failures, even in well designed systems, the failure of one component, in the presence of redundancy, may tax the remaining systems, which, subject to the same conditions that caused the first to fail, with the added pressure, begin to fail in turn. 

 

And in many systems of this size, MOFSETs MOSFETs are used I have read, so there is the possibility to have power to one or more of the motors either go to zero, or be frozen fully open, with no ability to control it, except cutting the cable. See this video and his analysis of what when wrong for an example.

 

http://diydrones.com/profiles/blogs/awesome-manned-electric-multico...

 

I assume you have also seen the Chinese-made gas powered human multicopter videos?

 

All three seem very dangerous to me, for their pilots. But all three teams know more about multicopter flight than I most likely ever will, also, so I watch with amazement, between my fingers, as I hide my eyes from the accident I fear is coming ... but I cannot look away either.

 

 

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Permalink Reply by CyberCrash on November 20, 2011 at 5:07am

Don't you worry:

 

....it's German Engineering!   ;-)

 

That's why my quad didn't flip eather       ...yet   :-)

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Permalink Reply by Michael Pursifull on November 20, 2011 at 6:19am

While I generally agree with that, and I am amazed at the boldness and attractive build, the Bachem Ba 349 Natter was also German Engineering. My point is everyone makes mistakes. I think a roll bar is still needed for the safety of the pilot. A helmet is not enough if it loses stability and tears apart, or flips. Neither is a roll bar, but it might give him at least a chance, and I don't think he has a chance without it.

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Permalink Reply by CyberCrash on November 20, 2011 at 6:31am

Of course your're right. Safety is important.

 

But I guess they left out the roll bar because of the extra weight.

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Permalink Reply by Michael Pursifull on November 20, 2011 at 7:27am

in my case, I would add the roll bar and leave out the pilot instead ;-)

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