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 Subject: jumping out of a plane advice Category: Science > Physics Asked by: forrest311-ga List Price: \$20.00 Posted: 27 Jun 2006 17:04 PDT Expires: 27 Jul 2006 17:04 PDT Question ID: 741598
 Can a person safely jump out of a small plane going 70 mph and 60-75 feet high into a large lake without a parachute? The stunt man has experience falling off things and getting hit by cars, but this particular stunt would be a first. The pilot is well trained. The person will be wearing a wet suit, boots, maybe helmet.
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 Subject: Re: jumping out of a plane advice From: qed100-ga on 27 Jun 2006 21:35 PDT
 Hi, Let's say the stunt actor falls from 75 feet at a horizontal speed of 70 mph. By the time he arrives at the water he'll have a vertical speed of 47.37 mph. But the composite velocity of this with the horzontal speed will be 84.52 mph, and angle of incidence at the water's surface will be about 39 degrees. So there'll be some tendency to reflect off the surface, rather than cleanly slice right through. It could be a rather complicated and risky endeavor.
 Subject: Re: jumping out of a plane advice From: bcattwood-ga on 28 Jun 2006 05:11 PDT
 He might be better off bouncing off the surface than "slicing clean through". Hitting the water at 84mph is the equivalent of jumping off of a 240ft high bridge, which is something very few people would survive.
 Subject: Re: jumping out of a plane advice From: myoarin-ga on 28 Jun 2006 05:24 PDT
 Perhaps with some armor under the wetsuit the stunt man could survive. I'm thinking of his landing on his back with plastic armor to protect him there that holds his body stable - stiffening his spine and neck and holding his ribs in place. But I am no expert. Sounds like a good scene to use a dummy for. Qed100 can probably tell us how long the fall would last, probably not much time for the stunt man to do anything of interest or importance to the plot. Flaying arms would be about all anyone in the situation would do, which a dummy could also do.
 Subject: Re: jumping out of a plane advice From: qed100-ga on 28 Jun 2006 08:24 PDT
 Yeah. The fall from 75 feet will only last slightly more than 2 seconds. forrest311, is there a compelling need for a living stunt actor to do the fall?
 Subject: Re: jumping out of a plane advice From: forrest311-ga on 28 Jun 2006 11:42 PDT
 this is not something we can use a dummy for. it's more about the actual stunt than filming it. The question is if it is safe. Is there a safer height the plane could be at or some sort of thing he should wear...neck, back protection? The bottom line is what kind of injuries would you forsee?
 Subject: Re: jumping out of a plane advice From: yorker-ga on 29 Jun 2006 00:12 PDT
 With all due respect to the intelligence and broad knowledge of my fellow Google Answer confreres, this is absolutely NOT the kind of question you should be asking here!! Anyone even remotely considering doing something like this should be engaging an experienced, qualified, professional stunt team, and let THEM decide if the stunt is feasible, and if so, how it should be done. This is absolutely no place for amateurs, no matter how well-meaning.
 Subject: Re: jumping out of a plane advice From: omeganumber-ga on 30 Jun 2006 09:05 PDT
 No
 Subject: Re: jumping out of a plane advice From: radke_556-ga on 12 Jul 2006 06:28 PDT
 If you really must do this stunt i would suggest 1) a helmet. Water surface tension can be deadly at these speeds. 2) neck support. The last thing you want is your stuntman to be paralized in a lake.
 Subject: Re: jumping out of a plane advice From: knowitawe-ga on 21 Jul 2006 21:04 PDT
 No. The stunt man can break his back when he hits the water. There is a maximum speed and height that helicopters should be moving when they drop frogmen. It's well, well below 70 ft and 60 mph. Maybe an experienced naval aviator can weigh in. Don't do it.