Man plans to luanch himself 20ft in the air

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Discussion Overview

The discussion centers around the feasibility and safety of a man attempting to launch himself nearly 20 miles into the air using a homemade rocket and a large crossbow. Participants explore the required thrust, potential risks, and the implications of such a stunt, while also engaging in humorous commentary.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions the amount of force needed for the launch and whether it is possible, expressing concern about the likelihood of death during the attempt.
  • Another participant notes the thrust of 1,350 lbs mentioned in the article but highlights the lack of information on the distance over which this thrust would act, complicating the evaluation of the launch's feasibility.
  • Some participants express skepticism about the stunt, suggesting that it is too dangerous and unlikely to receive FAA approval.
  • A mathematical formula for calculating the speed required to reach a certain height under gravity and drag is provided, inviting others to explore the calculations.
  • Humorous remarks are made regarding the absurdity of the situation, including references to the Darwin Awards and a scene from Dr. Strangelove.
  • Questions are raised about the necessary size and specifications of the crossbow needed for such a launch.

Areas of Agreement / Disagreement

Participants express a mix of skepticism and humor regarding the feasibility and safety of the launch. There is no consensus on the safety of the stunt, with some asserting that the probability of death is zero due to FAA regulations, while others argue that the risk would be high if it were to proceed.

Contextual Notes

The discussion includes various assumptions about the physics involved in the launch, the safety measures that would or would not be in place, and the implications of attempting such a stunt without clear definitions of terms like "thrust" and "draw length." There are unresolved calculations and speculative statements regarding the mechanics of the launch.

Who May Find This Useful

Individuals interested in physics, engineering, safety regulations, or those who enjoy humorous takes on extreme stunts may find this discussion engaging.

scott1
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Man plans to luanch himself 20mi in the air

There is no subtle way to say this: Brian Walker plans to shoot himself nearly 20 miles into the air aboard a homemade rocket launched from what could be the world’s largest crossbow. (Seriously.)
http://www.wired.com/wired/archive/14.06/start.html?pg=11
Ok so how much froce would he need to fire him and is it possible?
And how likely will he die(99.9% or 99.99999998%)
 
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The article says 1,350 lbs of thrust. There was no indication of the distance over which that thrust would act so we have no way of evaluating whether he could achieve the speed necessary to rise 20 miles AND allow for very substantial air drag.

Also, the probability that he will die during the event is 0. The FAA will not approve such a preposterous stunt.
 
Um, this thread might not get the attention you'd hoped for, considering the wording of the title...
 
DaveC426913 said:
Um, this thread might not get the attention you'd hoped for, considering the wording of the title...
Yes but I think I'am getting good enough attention.
 
I clicked on it just because the 20 foot thing sounded silly :smile:
 
Tide, You'd be amazed at what they'll grant an experimental ticket for. Personally I think this guy is another in the line of morons that have a bit too much money and not enough sense to know that they don't know what they are doing.
 
The speed required to rise ballistically to a given height under the influence of gravity and drag is

[tex]v_0 = v_T \sqrt {e^{2 g h /v_T^2}-1}[/tex]

where [itex]v_T[/itex] is the terminal velocity. Try plugging a few numbers in! :)
 
This reminds me of a certain scene from Dr. Strangelove...
 
Is this year's Darwin Award spoken for yet?
 
  • #10
No, but I'll second that nomination! :-)
 
  • #11
Is this year's Darwin Award spoken for yet?
I wish it hadn't :groan: I already got it.
 
  • #12
Tide said:
Also, the probability that he will die during the event is 0. The FAA will not approve such a preposterous stunt.
Yes if he did the probabillity will be high.

How large would the crossbow have to be to luanch a person 20 miles high?
 
  • #13
Just off the top of my head, I'm guessing that it would need about a 10 mile draw length. (It all comes down to how good your string is. :-p )
 
  • #14
My Iq just went down reading this tread...
 
  • #15
So you'll be building one of these soon, then?
 
  • #16
A two seater. I will use my model piper cub for thrust. :smile:
 
  • #17
Great! I'll take right seat. Just give me a minute to go get my Sumo suit and scuba mask. (That's pretty much the same as a space-suit, isn't it?)