flyhi

Disagree. With approx. 400 jumps on a Vengeance, I start a 180 at

Hope so. Shit happens. And it usually happens because of physics.

You haven't seen it until you've seen the edition where Bill speak Japanese. They have a dubbed one of those in Hawaii. Hillarious. Mooshy mooshy. Shit happens. And it usually happens because of physics.

1. People who start a sentence with, "They can put a man on the moon, but they haven't found a way to..." 2. People who dress up their pets in funny little pet clothes. Especially when (always?) they are more stylish than what I am wearing. 3. They can put a man on the moon, but they haven't found a way to upsize the Katana to a 135. Maybe we need to get Burt Rutan involved. Shit happens. And it usually happens because of physics.

I think if you cross reference this movie with the time honored classic "Eraser" (possibly talk to a pre-law student who is learning about the government's witness protection program by reviewing that film), you will see the correct procedure would be for Johnny to toss a chair into the engine first. The ensuing FOD (Frickin' Outrageous Drag) damage would change the airflow enough to permit the jump. Shit happens. And it usually happens because of physics.

3.7: 4: 0 Tasted at three wineries: Purchased seven (maybe eight. I needed to recount them.) bottles Four RW jumps Sunday. You thought those were fun? Got Pix? Shit happens. And it usually happens because of physics.

If you truly believe this, I feel badly for you. Shit happens. And it usually happens because of physics.

You could go over to Orilla and get a bikini wax ($20 - $40 depending on what... size?), have a tanning session, and engage in some really good ear candling. (No idea what that is, but it costs $35 and it's in Canada, so I bet it has something to do with hockey and beer.) Shit happens. And it usually happens because of physics.

Without instrumentation, I don't think we could know exactly what V is. With enough assumptions, you could probably come up with an approximation which might be close. Assume both individual flares and at some point reach zero forward and zero vertical speed, and assume no or negligible wind perpendicular to the bottom of the canopy other than that generated by his descent. Assume the descent is relatively vertical and no lift is generated. Assume a stable, non-moving air mass. Ignore the effects of wing tip vortices. And a key one, assume linearity (not true, but discussed later). Realize that in 20 feet you would not hit terminal velocity prior to the ground (constantly accelerating.). With the heavy assuming out of the way, you could time it and say from 20 feet it took five seconds to impact land. you could use that and say the canopy saw wind at the rate of 4 fps. You might try from the 0-0 flare/stall down to 10 feet and find it takes 4 seconds, or 2.5 fps of velocity. And I believe that is what you would find due to the effects of acceleration due to gravity. And that would be why the linearity assumption would not be correct, but would give a place to start. To be more accurate, you might want to vid the whole thing (let me know if you find some 300 lb guy willing to do this one!) and then measure the time from say foot 18 to landing. More accurate might be from foot 19 to landing, ad nauseum. The process itself is akin to taking the derivative of a function where you model it by analyzing smaller and smaller pieces of it until the piece is so small a linear function approximates it. Shit happens. And it usually happens because of physics.

I think what Spizzarko is saying will be the only drag you would probably have to worry about. The delta in drag between wearing lycra and cotton (skin friction) would probably not amount to much. And I would think, reaching way back, the drag caused by an inflated canopy (creating no lift) seeing a relative wind moving from bottom to top would be defined as F = 1/2 (rho)*Vsquared where rho is the density of the medium (air) and V is the velocity of the air. If you work the units out, you will see that this F is related to the F(orce) in my post above as a force over a unit area (psi or psf). It would seem to me, then, that the larger the area of the parachute, the more drag it would have. I still think the descent caused by gravity would be considerably greater making the mass of the individual the most important aspect, but you would have to run some numbers to figure that out. And I think you could disregard the effects of the density of air since it would be a constant in this case (not varying due to altitude change or compressibility.). Kind of interesting if you look at it in terms of, say a bicyclist. The force he is working against at 10 mph vs 20 mph is not doubled, but quadrupled because of the V squared term. One of the reasons they use the handlbars they do to reduce the projected image and thus surface area hitting their "relative wind". Of course, if I were you, I would run this by BillVon for a sanity check. He may be able throw in some PDE's to really clear it up. Shit happens. And it usually happens because of physics.

Holding everything constant as you requested and assuming no one has any forward velocity, only downward velocity from gravitational attraction to the earth, then I think you get into the Newtonian thing about F=mA to determine the force upon impact. If you thing about both performing an equally efficient or inefficient landing, then the A (acceleration, or in this case deceleration) would be the same (and here we caveate it with the oft used simplification, ignore the effects of drag. From 20' it's probably negligible anyway.) and the only difference would be the m (mass). And here, as in the dating pool, the big boy loses. You can think of acelertion as the time rate of change to go from whatever fps you are descending at to 0 fps. That would make the units feet per second squared. Obviously, cushioning the impact (really thick sox?)or doing a good plf will make the deceleration slower and reduce the force linearly. I think. then again, they did name a cookie after that Newton guy, right? [Edited before the physics police attack.] Shit happens. And it usually happens because of physics.

I now realize why getting load one together every morning was so difficult. Shit happens. And it usually happens because of physics.

Shit happens. And it usually happens because of physics.

Read the reviews on HyPer's Blade canopy. When I went to rate them, I received: Tried twice on each. Did a quick search and did not find a similar entry here. If it is, I apologize. Shit happens. And it usually happens because of physics.

My favorite: "Does this canopy make my ass look fast?" Shit happens. And it usually happens because of physics.

Why do they call it the World Series if they only play it in America the Bronx? Shit happens. And it usually happens because of physics.

Very similar, except, I share my office with another uninformed individual. Shit happens. And it usually happens because of physics.

Redundant? Shit happens. And it usually happens because of physics.

(I really hate my job tonight/morning/day/afternoon/bmnt/ad infinitum.)^2 Shit happens. And it usually happens because of physics.

No joy. Unless you count the fact that I won a Xaos-21 108 for $1318. Rather have a XAOS-27 118 if you can arrange it. Mahalo. Shit happens. And it usually happens because of physics.

From what I've seen no-limit shopping followed by a chocolate something seems to work every time. Shit happens. And it usually happens because of physics.

I think Poo Bah ran out at 2000 posts, didn't it? Shit happens. And it usually happens because of physics.

Wouldn't you rather be closer to the right tail? Shit happens. And it usually happens because of physics.

I bet you'll find that people will be more willing to tell you about their sex lives than how much money they make. That they save for those with whom they are intimate. Shit happens. And it usually happens because of physics.

David Hasselhof: Antichrist I salute your total disregard for your afterlife. Stay warm. Shit happens. And it usually happens because of physics.