Just had to say...this dude is hardcore:
http://upload.wikimedia.org/wikipedia/commons/8/81/Kittinger-jump.jpg
Badass.
http://upload.wikimedia.org/wikipedia/commons/8/81/Kittinger-jump.jpg
Badass.
I got a chuckle out of this page.
Go to the home page and look around. They do have some real stories there.
Go to the home page and look around. They do have some real stories there.
Most skydivers generally refer to an impact as a "bounce".
When I first started sport jumping many years ago, I was amazed when they told me that I would need to wear a weight vest carrying 10 lbs. of lead weight in order to stay "down" with the rest of the formation ("you're telling me I gotta strap on 10 lbs. of lead to jump out of an airplane with you fools? Unbelievable....").
It comes down to a factor of drag and weight. I am tall and skinny (at least I was at the time...) so my body presented a fair amount of resistance to the apparent wind while having a low amount of mass which made it somewhat difficult to fall at the same speed as the other jumpers.
As a way of compensation, people like myself wore skin tight jumpsuits made from slick fabrics such as nylon etc., and utilize weight vests with an appropriate amount of lead to assist with their fall rate. Short squat jumpers on the other hand, would wear very baggy jumpsuits (I'm talkin huge flappy suits) made from materials with more drag such as a coarse cotton.
From there, you can also adjust your fall rate with body position. The slowest fall rate is acheived with a body position much like you would look if you laid face down on a giant beach ball (cupping the air stream). For a faster fall rate, you "get small" (elbows and hands in close to your body, knees slightly bent and legs together. This will allow you to spill more air.
Terminal velocity asumes a jumper falling chest to earth in a stable body position (120mph or 176 feet per second). A perfect head down body position can acheive a much greater speed of around 200 mph. Best to not open your main at that speed though, as your likely to get pretty mangled by the deceleration of your chute.
One fun thing we used to do is to play catch with a tennis ball while in freefall. The tennis ball has a very similar drag to weight ratio as a human so it falls right with you, though it moves rather slowly toward the person it is thrown at. Pretty fun though. You can see it in action here: http://video.yahoo.com/video/play?vid=c9b84cf7fc8a1bdc33f71fdc55553c19.949148 (notice how much the suits vary to compensate for the jumper's mass/aspect ratio).
The most amazing jumps I have ever seen is by a group of norweigan jumpers who use hi-tech "wingsuits" while base jumping. These guys literally fly down canyons and buzz the treetops and rocks with only a few feet of clearance. The only requirement is a slope greater than their maximum glide ratio and one last cliff at the end which will allow them time to deploy their parachute.
MOST AMAZING SKYDIVE VIDEOS I HAVE EVER SEEN:
http://www.youtube.com/watch?v=y_NaYHb87U8
For the other, go to skydivingmovies.com (best skydiving movie site on the internet) and search for a movie called "You fly we try".
Awesome stuff!
When I first started sport jumping many years ago, I was amazed when they told me that I would need to wear a weight vest carrying 10 lbs. of lead weight in order to stay "down" with the rest of the formation ("you're telling me I gotta strap on 10 lbs. of lead to jump out of an airplane with you fools? Unbelievable....").
It comes down to a factor of drag and weight. I am tall and skinny (at least I was at the time...) so my body presented a fair amount of resistance to the apparent wind while having a low amount of mass which made it somewhat difficult to fall at the same speed as the other jumpers.
As a way of compensation, people like myself wore skin tight jumpsuits made from slick fabrics such as nylon etc., and utilize weight vests with an appropriate amount of lead to assist with their fall rate. Short squat jumpers on the other hand, would wear very baggy jumpsuits (I'm talkin huge flappy suits) made from materials with more drag such as a coarse cotton.
From there, you can also adjust your fall rate with body position. The slowest fall rate is acheived with a body position much like you would look if you laid face down on a giant beach ball (cupping the air stream). For a faster fall rate, you "get small" (elbows and hands in close to your body, knees slightly bent and legs together. This will allow you to spill more air.
Terminal velocity asumes a jumper falling chest to earth in a stable body position (120mph or 176 feet per second). A perfect head down body position can acheive a much greater speed of around 200 mph. Best to not open your main at that speed though, as your likely to get pretty mangled by the deceleration of your chute.
One fun thing we used to do is to play catch with a tennis ball while in freefall. The tennis ball has a very similar drag to weight ratio as a human so it falls right with you, though it moves rather slowly toward the person it is thrown at. Pretty fun though. You can see it in action here: http://video.yahoo.com/video/play?vid=c9b84cf7fc8a1bdc33f71fdc55553c19.949148 (notice how much the suits vary to compensate for the jumper's mass/aspect ratio).
The most amazing jumps I have ever seen is by a group of norweigan jumpers who use hi-tech "wingsuits" while base jumping. These guys literally fly down canyons and buzz the treetops and rocks with only a few feet of clearance. The only requirement is a slope greater than their maximum glide ratio and one last cliff at the end which will allow them time to deploy their parachute.
MOST AMAZING SKYDIVE VIDEOS I HAVE EVER SEEN:
http://www.youtube.com/watch?v=y_NaYHb87U8
For the other, go to skydivingmovies.com (best skydiving movie site on the internet) and search for a movie called "You fly we try".
Awesome stuff!
That link says that they had to load the tennis ball with ballast to make it fall at the same rate as the people. The terminal velocity of a tennis ball is only about half that of a skydiver.
Originally posted by: Zenmervolt
Hence my "assuming a physics problem" answer and my secondary "assuming this is a real world scenario" answer.
ZV
Assuming a spherical cow...
AbAbber2k
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- Mar 1, 2005
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