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#41
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Volocopter - safest aircraft in the world
Martin Gregorie wrote on 12/15/2015 5:58 AM:
On Mon, 14 Dec 2015 19:35:53 -0800, Eric Greenwell wrote: Eric Greenwell wrote on 12/14/2015 7:16 PM: I think it's "gave over", That should be "game over"! Correct! As for the rest, please bear in mind that is wasn't looking at catastrophic structural failure where, of course, you're correct. OTOH I was on about the situation where the only way out from *any* failure in a Volocopter is to pop the BRS and pointing out that this is fatal if it happens down in the death zone at a height from where a conventional aircraft could usually glide or autorotate to a landing. Maybe a I misunderstand what "any" failure is. It's obvious losing one of the thrusters is not a serious problem, as the other seventeen can handle the load; and actually it could lose several and still land safely. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 - "Transponders in Sailplanes - Dec 2014a" also ADS-B, PCAS, Flarm http://soaringsafety.org/prevention/...anes-2014A.pdf |
#42
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Volocopter - safest aircraft in the world
On Wed, 16 Dec 2015 19:10:42 -0800, Eric Greenwell wrote:
It's obvious losing one of the thrusters is not a serious problem, as the other seventeen can handle the load; and actually it could lose several and still land safely. Don't forget that loosing any one thruster requires a thrust reduction from the rest that's exactly equivalent to stopping the corresponding diametrically opposite thruster. It is doesn't do this it will go skating off sideways in the direction of the failed thruster. This reduces the max available thrust by 11% which could easily make staying in the air impossible if the Volocopter is within 11-12% of MTOW or on a hot day. It may also have implications for a soft landing. AFAIK there is no available info on the relationship between max available thrust and MTOW. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | |
#43
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Volocopter - safest aircraft in the world
This isn't necessarily true in this case. Yes, if the aircraft had only one engine on each side of the roll axis then a corresponding reduction in the opposing engine would be required. However, with 18 engines and either 8 or 9 engines on each side of the axis (depending on orientation of travel), there are multiple opportunities to increase thrust from other engines on the same side to offset the failed one. Of course, this assumes we're not already at max thrust of the system. In an active system such as this it is unlikely that the pilot would be able to command "true" max thrust of the system as there would be some percentage held in reserve for just this sort of attitude control scenario.
On Thursday, December 17, 2015 at 4:03:19 AM UTC-6, Martin Gregorie wrote: Don't forget that loosing any one thruster requires a thrust reduction from the rest that's exactly equivalent to stopping the corresponding diametrically opposite thruster. It is doesn't do this it will go skating off sideways in the direction of the failed thruster. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | |
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