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  #31  
Old 01-29-2015, 07:36 AM
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scrollF4 scrollF4 is offline
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Hi Andy.
The Martin Baker seat in the F-4 and the Aces II have interdicter-style connections. Not sure about the very latest seats.

Of interest, Harriers have explosive chord laced onto the top of the plexi: It blows at ejection, shattering the plexi one heartbeat before the seat blows through.
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  #32  
Old 01-29-2015, 09:44 AM
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Andy Hill Andy Hill is offline
 
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Quote:
Of interest, Harriers have explosive chord laced onto the top of the plexi: It blows at ejection, shattering the plexi one heartbeat before the seat blows through.
Well familiar with the MDC - same as Hawk & JP Mk5. Doesn't always work though
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  #33  
Old 01-29-2015, 05:56 PM
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Hmm... On the tip-up canopy, the difficulty i've always foreseen is in getting the rear of the canopy high enough to clear the roll bar... I think by that angle there will be enough clearance that the aerodynamic forces will push the hinges back out of their slots. Maybe if the ejection seat had a post that hooked on the rear of the canopy and pushed the rear of the canopy up... Then when you eject you'd have a nice big plexi windshield in front of you to protect you from the elements. If you and your passenger eject at the same time you could huddle behind it until the airplane falls away and your chutes open... Or there could be a single chute for both seats...

Okay, back to reality...
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  #34  
Old 01-30-2015, 07:37 PM
cguarino cguarino is offline
 
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Default one I know of

The Viper has two cables attached to the canopy. One has to be pulled for the seat to go. The Hawg and the Eagle sequence the canopy off first but if it doesn't go it will fire the seat right through it. There are canopy breakers on the top of the seat. If you look close you will see them on the Hawg and Eagle seats but not on a Viper seat.
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  #35  
Old 01-31-2015, 01:16 AM
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claycookiemonster claycookiemonster is offline
 
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Default BRS, kind of...

The F-111's entire cockpit was ejected if the handles were pulled. No flail injuries at high Mach, no parachutes or harnesses to wear, and no poopie suits when flying over water. It floated and actually had a bilge pump that could be engaged to the control stick to pump water over board. There was room for emergency food and water! Being early 60's technology, there was no gyro stabilization. One consequence is that crew members weight couldn't differ by more than some forgotten amount or the capsule wouldn't eject upwards, but would roll to the fat guy side!

The first edition of the B-1 had the same system. Production models weren't supersonic and reverted to individual seats.

Capsule Pros: Comfy cockpit environment, only one guy has to pull the handles and it saves both guys. Most importantly: you can get your story straight on the way down!

Capsule Cons:Landing impact is taken on your back (since you're seated) rather than on your legs. I have a friend who punched from a Vark in England in 1987; he lost 1 1/2 inches in height when the capsule impacted the ground at the wrong angle due to system malfunctions - he was able to return to flying.

https://www.youtube.com/watch?v=M8l79lSjVMg
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  #36  
Old 01-31-2015, 06:04 AM
sailvi767 sailvi767 is offline
 
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Quote:
Originally Posted by topgun260 View Post
All I know is that when Goose hit the canopy in Topgun, (you know, when the F-14 was in a flat spin heading out to sea) it didn't work out well for him. I say lose the canopy first and then punch out.
Amazingly enough that was one of the few true points in the movie. If the F14 went into a flat spin the RIO needed to manually jettison the canopy before initiating ejection. If not and a normal ejection was performed the RIO's seat could hit the canopy. There was not enough forward airflow in a flat spin to take the canopy clear of the aircraft fast enough in a normal ejection sequence. The pilot would be incapacitated by the Eyeball out G so it was up to the RIO to remember to get the canopy clear first.
George
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  #37  
Old 02-13-2015, 05:44 AM
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Infidel Infidel is offline
 
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Have you seen one of the video's where someone takes an airbag unit from a vehicle and places it under a seat for an unsuspecting victim? It might hurt like ****, but probably a lot cheaper.
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  #38  
Old 02-13-2015, 07:00 AM
Triple7 Triple7 is offline
 
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Default Ejection seats

Ok, after one takes their knees off via the instrument panel now what? If an ejection seat is needed you've got other problems!
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  #39  
Old 02-13-2015, 07:10 AM
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Pmerems Pmerems is offline
 
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Default What about the canopy?

If the canopy is already open why not just jump? A canopy jettison system linked to the ejection event isn't a trivial. This only addresses half the issue.
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  #40  
Old 02-13-2015, 05:35 PM
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DCat22 DCat22 is offline
 
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Yeah....I'd rather not add something else that can kill me easily, just sitting on the ground. Unless your head is on the wrong place, a ground BRS deployment wouldn't exactly kill you. Just your wallet.

Looks like this under 100' or so (or sitting on the ground) would just catpult you in a nice arc to a splat. Assuming you were strapped in...even worse if you were doing mx leaning over the seat or something.

I think I'd rather stick to strong planes and chutes when required. Cool in concept though.
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