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  #21  
Old 09-15-2018, 01:41 AM
rv8ch rv8ch is offline
 
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Default conditions matter

I guess it would depend a lot on the conditions. I recall the Ethiopian Air crash video where it looks like the pilot put a wingtip in to dissipate energy and while many survived, it was not as successful as the Hudson water landing. Avoiding a pancake while keeping it just above stall will be my strategy - let the landing gear take some energy as it comes in. Tighten the harnesses as much as possible, and get ready for some disorientation after impact.
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  #22  
Old 09-15-2018, 09:06 PM
mspenc45 mspenc45 is offline
 
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Originally Posted by rv8ch View Post
Ciao Luigi, I've read that some recommend keeping the canopy closed during an off-field landing for exactly the reasons you mentioned - it will slide shut quickly, and possibly jam. Really glad you got out of there ok.
In our Tiger, AA5B we carried a 12" piece of 1" PVC pipe that had a longitudinal section cut out allow us to snap it in place over the rail, hopefully preventing the canopy from slamming forward in a crash. I am planning on carrying the same with me when we finally get our new RV-7A home to AZ from PA! East coast weather sucks!
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  #23  
Old 09-16-2018, 08:21 AM
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Steve Melton Steve Melton is online now
 
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based on this report, if I need to ditch, I will jettison my canopy.
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  #24  
Old 09-16-2018, 11:27 AM
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donaziza donaziza is offline
 
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I hear you Steve---I've got my canopy where it can be jettisoned also. BUT---Will it take the tail off if one does that??
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  #25  
Old 09-16-2018, 12:32 PM
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Sam Buchanan Sam Buchanan is offline
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Default canopy jettison

Purely speculation...but I can't envision a likely scenario where serious damage to occupants and aircraft tail doesn't occur when a tip-up canopy is jettisoned....damage might be limited to the tail surfaces for a slider. The canopy is heavy and when propelled by the slipstream represents a huge amount of kinetic energy.
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Last edited by Sam Buchanan : 09-16-2018 at 12:34 PM.
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  #26  
Old 09-16-2018, 01:13 PM
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Steve Melton Steve Melton is online now
 
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Quote:
Originally Posted by donaziza View Post
I hear you Steve---I've got my canopy where it can be jettisoned also. BUT---Will it take the tail off if one does that??
anti-splat vert stab straps may help prevent that. slow down and jettison, flip over, unstrap and swim away. simple as that.

put on your safety glasses before jettison.
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Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 700+ for all

Simplicity is the art in design.

see Amanda Melton for www.rvplasticparts.com
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  #27  
Old 09-16-2018, 03:57 PM
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RV8JD RV8JD is offline
 
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Quote:
Originally Posted by Sam Buchanan View Post
Purely speculation...but I can't envision a likely scenario where serious damage to occupants and aircraft tail doesn't occur when a tip-up canopy is jettisoned....
Yup. This info may be of interest. An actual canopy jettison incident where the pilot (Sean Tucker) had time to plan his leaving the airplane. In the video linked below, Sean Tucker talks about his bailout while practicing for Sun 'n Fun in 2006. He lost elevator control shortly after takeoff, but he could keep the airplane airborne using the elevator trim. But given the lack of stability of his aerobatic biplane, he didn't think he could land it with just the trim.

At about 4:00 he says that even though he ducked forward before jettisoning the canopy, it hit him in the head when it departed. He says that if he didn't have a helmet on, he thinks he may have been disabled by it. He had dents in his helmet from the canopy. Tucker's rendition of his bailout is really worth listening to.

Sean Tucker Discusses His Bailout at Sun 'n Fun 2006
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  #28  
Old 09-16-2018, 04:07 PM
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Sam Buchanan Sam Buchanan is offline
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Quote:
Originally Posted by donaziza View Post
I hear you Steve---I've got my canopy where it can be jettisoned also. BUT---Will it take the tail off if one does that??
Quote:
Originally Posted by Steve Melton View Post
anti-splat vert stab straps may help prevent that. slow down and jettison, flip over, unstrap and swim away. simple as that.

put on your safety glasses before jettison.
A thought exercise....shoot a canopy and frame at the tail of your airplane with a velocity of 150+ mph and see if any catastrophic damage occurs.....

But, maybe the canopy wouldn't hit the tail with that amount of force since both it and the plane started out traveling at the same rate.....but who knows.....a bird strike sure can cause a lot of damage.....bet a canopy strike would be much worse.
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Last edited by Sam Buchanan : 09-16-2018 at 08:06 PM.
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  #29  
Old 09-16-2018, 08:38 PM
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well, obviously you have to duck when you pull the canopy release handle. jettison at 80 kts.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 700+ for all

Simplicity is the art in design.

see Amanda Melton for www.rvplasticparts.com

Last edited by Steve Melton : 09-16-2018 at 08:41 PM.
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  #30  
Old 09-16-2018, 10:49 PM
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RV8JD RV8JD is offline
 
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Quote:
Originally Posted by Steve Melton View Post
well, obviously you have to duck when you pull the canopy release handle. jettison at 80 kts.
See my post #27 above. Sean Tucker purposely ducked and still the departing canopy hit his helmet hard enough to leave dents in it.
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Carl N.
Arlington, WA (KAWO)
RV-8, 435 Tach Hours
(Pic 1),(Pic 2)
- Out with the Old, In with the New
(Pic)
RV-8, 1938 Tach Hours (Pic 1),(Pic 2) - Sold

Glasflügel Standard Libelle 201B, N564NS - Sold
Rolladen-Schneider LS1-f, N61MP - No longer owned

Last edited by RV8JD : 09-16-2018 at 10:52 PM.
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