Skydiveing Attempt

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RV BLUE
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Skydiveing Attempt

Post by RV BLUE » Tue Oct 10, 2006 5:56 pm


Mike C
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Post by Mike C » Tue Oct 10, 2006 7:08 pm

Hi RV

They will probably be using a technique called H.A.H.O (High Altitude High Opening). Its a military form of parachuting enabling troops to be dropped a great distance from their objective, ie dropped in friendly territory and float across the border etc.

Best of luck to the lads though. Wouldnt find me jumping out of a good a/c. :lol:

buggyB
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Post by buggyB » Wed Oct 11, 2006 10:25 am

While it's technically quite possible it could be a very risky adventure indeed. They would be very much at the will of the winds aloft, which can be anything up to 180deg off surface winds at that altitude. There is also the freezing cold (around -30deg C at 25,000') to contend with and, at a decent rate of 1,500' per minute, that could work out to be a long time.

Then there's the risk of oxygen system malfunction. While a conopy should track fairly straight with the pilot unconscious it would take a long time to descend to safer altitudes of sub 14,000'. This prolonged exposure could cause serious damage, if not death. Even if the pilot were to initiate a high descent rate spiral turn and somehow hold that turn during a period of unconsciousness the prolonged high G forces would have an even more detrimental effect. One could always cutaway at the first sign of O2 system malfunction but the trouble with hypoxia is that it's very difficult to spot before rational thought goes out the window. Many HALO skydivers have passed out after exit because of this and recovered consciousness below 14k, but in freefall you are talking about 60 seconds to reach a safe altitude.

I guess that they would have to plan for landing short of target, as ditching in that part of the ocean is not recommended at any time of year. One would imagine that a SAR heli could loiter in the area should the need arrise. Surface recovery vessels would be too slow and the potential landing area too great to strategically place them.

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