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-   -   question for military fliers (http://forums.pelicanparts.com/off-topic-discussions/477553-question-military-fliers.html)

svandamme 06-03-2009 03:11 AM
No US operational helicopters, but the Russians fitted a Zvezda K-37 seat the KA50 and KA52 helpcopters... those even have twin rotors to deal with when ejecting.

http://www.zvezda-npp.ru/images/05_5.jpg
http://www.zvezda-npp.ru/images/05_6.jpg

MFAFF 06-03-2009 03:16 AM
Ka 50 and Ka 52 have ejector seats... but as Seahawk says... rare and these are dedicated attack ships..

The seats do link to explosive bolts in the rotor systems, allowing the baldes to be shed prior to the seats being launched up the rails.

Damn...Stijn beat me to it...

Seahawk 06-03-2009 04:28 AM
Nice pull...I'm going to do some searches to see if they have ever been employed/used.

Interesting data point for Russian helos is that the blade design was often optimized for speed and performance and the autorotation properties were very poor. Perhaps that is why they went with this system.

The early flight test of the system on US birds were not positive...the blade shed had to be exact or the helo would roll, pitch and yaw violently.

Quote:
Originally Posted by svandamme (Post 4699563)
No US operational helicopters, but the Russians fitted a Zvezda K-37 seat the KA50 and KA52 helpcopters... those even have twin rotors to deal with when ejecting.

http://www.zvezda-npp.ru/images/05_5.jpg
http://www.zvezda-npp.ru/images/05_6.jpg

cgarr 06-03-2009 04:36 AM
How about timing the ejection with an interrupter so you go between the blades?

widebody911 06-03-2009 06:33 AM
Quote:
Originally Posted by cgarr (Post 4699622)
How about timing the ejection with an interrupter so you go between the blades?
Been done - it's called a Cuisinart.

Seahawk 06-03-2009 10:37 AM
One other interesting aspect: The K-37 has counter rotating main rotor blade so it does not need a tail rotor. Unlike a conventional helicopter that relies on a tail rotor to counter the torque produced by the rotation of the main rotor, shedding blades on K-37 would not induce rapid yaw rates like it would on a conventional helo. In order for it to work, the main and tail rotor blades would have to be shed simultaneously.

Ok, interesting to me. :cool:

MFAFF 06-03-2009 11:11 AM
Quote:
Originally Posted by Seahawk (Post 4700246)
One other interesting aspect: The K-37 has counter rotating main rotor blade so it does not need a tail rotor. Unlike a conventional helicopter that relies on a tail rotor to counter the torque produced by the rotation of the main rotor, shedding blades on K-37 would not induce rapid yaw rates like it would on a conventional helo. In order for it to work, the main and tail rotor blades would have to be shed simultaneously.

Ok, interesting to me. :cool:
I think you'll find that unless you have contra-rotating rotors the shedding of blades, even if pretty much simultaneous will generate such yaw rates as to make ejection too dangerous...

Great looking helos those Kamovs....they look the part, no idea if they are actually any good tho'..

fintstone 06-03-2009 05:29 PM
Quote:
Originally Posted by Porsche-O-Phile (Post 4696031)
How exactly would one eject in the Osprey anyway? Up? Ummm, that's great if you're in cruise, but would be pretty messy if you're in takeoff/landing/hover mode with them big ol' blenders whirling around above you.

I suppose you could eject downward (I believe some of the 60s-era fighters did this) but the human body can take a helluva lot more force transversely than longitudinally, and much more positive Gs (getting shot upwards) than negative (getting shot downwards).

So I think it was a matter of simple practicality. But I still am not a real fan of that program or aircraft. I'd probably fly one, but I don't know if I'd ever feel completely comfortable in it. The "blood price" of the Osprey has been way too high (as has the dollar cost).
Just like flying with Delta. If the plane goes down....so does everyone aboard.

slodave 06-03-2009 05:40 PM
I confirmed that the Osprey does not have ejection seats. I was at a clients today, that developed a number of hydraulic parts for it. No, none of their parts have failed or caused an accident. One comment from one of the guys was, "that wouldn't be fair to the troops in the back"!

afterburn 549 06-03-2009 07:08 PM
Rarely would you even think of ejecting from a copter.....I suppose if one lost the main rotor, it would be a great idea
minced meat is a bad idea.
a good helicopter is a great crash worthy platform...I am not so sure about the osprey..an other name for death wish ?


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