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uvtreith(at)t-online.de
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 Posted: Tue Dec 15, 2009 2:53 am Post subject: AW: Emergency parachutes, opinions? |
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Hi All,
Our Europa Aircraft friends in CZ are developing at present together with Galaxy a rescue system for the Europa plane.
As far as I now they will use (at present) steel ropes (maybe too stiff). Two of them will have a “leading groove” underneath of the door sills, which can easily break away. The other fixing point(s) will be behind the canopy, so that the system is balanced. But as Graham says, the bird will hang with nose down a bit, so that the engine/nose gear will take the first impact.
Please visit www.europa-aircraft.cz and click the bottom links for Galaxy. The Info there is also in English.
I am sure some Europa pilots could be still with us when they would have a rescue system.
IMHO a parachute is not a good solution (except for test flying of course) as the most crashes will happen at lower flight level.
The Galaxy system is using a rocket ejection which will get out and open the rescue parachute also in lower levels.
I wish you all a Merry Christmas and a safe, enjoyful and healthy 2010.
Bruno
Europa Aircraft Germany
Von: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] Im Auftrag von GRAHAM SINGLETON
Gesendet: Dienstag, 15. Dezember 2009 09:24
An: europa-list(at)matronics.com
Betreff: Re: Europa-List: Emergency parachutes, opinions?
From: Fred Klein <fklein(at)orcasonline.com>
To: europa-list(at)matronics.com
Sent: Tuesday, 15 December, 2009 0:23:24
Subject: Re: Europa-List: Emergency parachutes, opinions?
--> Europa-List message posted by: Fred Klein <fklein(at)orcasonline.com (fklein(at)orcasonline.com)>
Exactly how one might create the recessed joggled area in a pre-molded fuselage would not be a challenge I'd take on. I'm surprised to learn that Miles determined that "the forward sling needs to be attached just behind the propeller"...it would appear to me that hard points port and starboard at the firewall would serve, but that would be pure speculation on my part.
Fred
A194
Fred
As I understand it, the airplane needs to hang c. 30 degrees nose down so the engine/nosegear takes the initial impact. Miles had straps at front and rear to achieve this but it was a very big job and eventually exhausted his patience, not least the bureaucratic issues.
Graham
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Tue Dec 15, 2009 7:39 am Post subject: Re: AW: Emergency parachutes, opinions? |
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I would think that a rescue parachute system would require considerably
more engineering than just installation. The attach points quite probably
need the fuselage to be designed from the ground up to take the vertical
stress and distribute it appropriately. Is the fire wall ceramic composite
really going to take 1450 lbs x 6 g in shear? Has someone tried even a
static stress test?
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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rparigoris
Joined: 24 Nov 2009
Posts: 804
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| Posted: Tue Dec 15, 2009 8:26 am Post subject: AW: Emergency parachutes, opinions? |
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Just a thought on ballistic parachutes. I'm with Ira that ground up approach may be the best way. That said I have quite a bit of experience with accidental drogue chute deployments, and boy as far as getting plane upright and out of a spin happens awful fast. I make inexpensive small parachutes with sewing thread and a lolly pop on them. I fly a 4' span flying wing with a pusher prop, mount two slight forward canted dowels on top of wing and pack chute and put lolly pop on top. Climb and shut off motor (have folding prop) roll upside down and pull some negative Gs. 9 out of 10 times it works fine and the kids have a great time,, 1 out of 10 times it tangles in the prop at climb out somewhere somehow. Instant that plane straightens out and becomes so controllable an amateur can control it. In other words instead of a chute that can carry the entire plane down, perhaps we should consider a much lighter drogue chute. Stall/spins and loss of control in IMC is far more common that aeroplanes breaking up. I believe a properly sized and positioned drogue chute could get the plane kinda flying without the need to do much else, perhaps just keep ball in center, can steer with just rudder and flare at the very end. What's your thoughts? a side benefit would be you would probably have a good attachment point to tow up a light weight glider. May be able to size so you could fly with power?? Could have it releasable?? Could tow a mini banner too?? Ya know in WW1 I think Germans had a parachute, or personal slowemdown device that was essential nothing more than a long roll of toilet paper, I forget how wide but it was a roll of fabric you were attached to, hmm. Anyone have a model Europoa so testing can begin immediate? Start small and work way up.Ron Parigoris [quote][b]
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