I found this http://blog.makezine.com/archive/2011/11/man-flys-in-electric-multi... on Makezine.com
if one would look at building something like this what should be taken into consideration? power source, motor etc.
may build a smaller model for uav apps.
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.
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.
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.
Don't you worry:
....it's German Engineering! ;-)
That's why my quad didn't flip eather ...yet :-)
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.
Of course your're right. Safety is important.
But I guess they left out the roll bar because of the extra weight.
in my case, I would add the roll bar and leave out the pilot instead ;-)