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Old 02 December 2005, 10:47 AM
  #31  
SJ_Skyline
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Originally Posted by Leslie
if you jump, your acceleration is 32 feet/ sec/ sec less a factor to allow for wind resistance. This will become more effective the faster you are travelling of course. The terminal velocity of a body at sea level air density is approx 120 MPH. I am sure you can work it out for yourself with all that information now.

Les
I'm sure density will be involved in this experiment!
Old 02 December 2005, 10:55 AM
  #32  
106rallye
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Originally Posted by Leslie
if you jump, your acceleration is 32 feet/ sec/ sec less a factor to allow for wind resistance. This will become more effective the faster you are travelling of course. The terminal velocity of a body at sea level air density is approx 120 MPH. I am sure you can work it out for yourself with all that information now.

Les
Does this mean that all things being equal the person who survived the 18000ft drop would have survived from any hight? in other words the speed at impact would be approx 120mph no matter what (obviously above a certain hight!) - the thought of anyone being able to survive hitting a solid object at 120mph is amazing!

Andy
Old 02 December 2005, 10:59 AM
  #33  
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Originally Posted by 106rallye
Does this mean that all things being equal the person who survived the 18000ft drop would have survived from any hight? in other words the speed at impact would be approx 120mph no matter what (obviously above a certain hight!) - the thought of anyone being able to survive hitting a solid object at 120mph is amazing!

Andy
Well no, because if you read the link about the guy who fell from 18000ft he hit trees first which obviously slowed him down to a speed which was survivable. Incredible stories all the same, imagine telling that to your granchildren, dont think they'd believe you
Old 02 December 2005, 11:15 AM
  #34  
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Originally Posted by 106rallye
Does this mean that all things being equal the person who survived the 18000ft drop would have survived from any hight? in other words the speed at impact would be approx 120mph no matter what (obviously above a certain hight!) - the thought of anyone being able to survive hitting a solid object at 120mph is amazing!

Andy
all the survivors in question hit something that slowed them gradually - trees, snow etc - you will reach 120MPH in about 5.5 seconds by which time you will have covered about 1500 feet, so falling from anything above 1500 feet will have the same impact velocity (strangely called terminal velocity) - his a soft branch at 120 and it will slow you down a little bit 5mph deceleration wont hurt that much - hit lots of soft branches and you come to a gentle halt. Same sort of theory as for crumple zones and airbags. They allow you to decelerate more slowly than simply face butting the wheel at impact speed
Old 02 December 2005, 12:15 PM
  #35  
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Originally Posted by 106rallye
in other words the speed at impact would be approx 120mph no matter what (obviously above a certain hight!)
Andy

no....if you jump high enough you will exceed terminal velocity and turn into a human fireball

T
Old 02 December 2005, 12:24 PM
  #36  
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You need to learn the PLF which is the best way to land when equiped, you let your legs go under controll and roll out side ways as you go to ground.

Supposed to lessen the chance of injury. That said as many as 10 % in a drop will probably be injured in one way or another.

Its not quite landing on your feet.

We drop from 15-20 foot walls but land bith feet first then bending at the knees till you can use your hands on the floor to further controll your landing.

Aston
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