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HOMEMADE PARACHUTE

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HOMEMADE PARACHUTE

Unread postAuthor: M3NT4L » Tue Oct 03, 2006 7:11 pm

i am making a ghetto parachute to deploy as i jump a 50ft drop from a bridge to water( only reason making the parachute is elongated fly-time)
it needs to be powered by some sort of pressure that can be released in an instant, i was thinking paintball co2 but i know there has to be a better/safer way. I NEED HELP IDEAS PERTAINING TO THE PRESSURE ISSUE and if you want to the whole project your help is appresiated :lol: here is a little drawing, oh the casing is made of pvc, and there is a wadding like thing to furtherr propell the parachute.
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Unread postAuthor: ProfessorAmadeus » Tue Oct 03, 2006 7:19 pm

I dont think it will open fast enough because, correct me if im wrong, Things fall at 13 feet per second. Why not make a hang glider?
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Unread postAuthor: rl93 » Tue Oct 03, 2006 7:41 pm

if things fall at 13 feet per second youd hit the water in under 4 seconds
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Unread postAuthor: Shrimphead » Tue Oct 03, 2006 7:43 pm

The force of gravity causes things in free-fall to accelerate. The longer something is falling for, the faster it falls.

In a friction free world, one can find the fall time using this equation:
D=VoT+.5at^2
Where D= displacement, Vo= initial velocity, T= time, a= acceleration,

If you plug the numbers in, you get this: 50ft=0t+.5(-32.2ft/s^2)t^2
Your initial velocity will be zero if you don't jump or anything, so that cancels out that and the first t. If you divide the acceleration by two, you're left with: 50ft=-16.1ft/s(t^2). Divide both sides by -16.1ft/s^2, and you have t^2=3.1s^2, because you can't have negative time. Then take the square root, and you're left with, t=1.8s.

Because I didn't take friction into account, you will be in the air for longer than that.

These seems like a really short time. I'm not positive that my calculations are correct, but I don't think I made any mistakes. If anyone notices anything wrong with those numbers, please tell me.
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Last edited by Shrimphead on Tue Oct 03, 2006 8:03 pm, edited 1 time in total.
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Unread postAuthor: squeaks » Tue Oct 03, 2006 7:48 pm

just to correct you, the acceleration due to gravity is 10 m/s or 32 ft/s.
so after just 1 second of his jump he'll already have traveled 16 ft. After 2 seconds he'll have gone 48 ft. So just as a fyi your parachute is going to need to deploy DAND fast, otherwise, splat
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Unread postAuthor: COD_FILLETS » Tue Oct 03, 2006 8:04 pm

ProfessorAmadeus wrote:Why not make a hang glider?


Well said.

Isint there a limit to the lowest altitude a parachute will open enough to stop you from going "splat"?
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Unread postAuthor: frankrede » Tue Oct 03, 2006 8:20 pm

Hmm, mental I olke you and I don't want you to kill yourself, I would just build a hanglider using abs pipe and tarps.
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Unread postAuthor: djt » Wed Oct 04, 2006 4:10 pm

it might open fast enough. i saw a show where some guy made something like this. im pretty sure he was at least 100 feet up though. but his opened in like 2 or 3 seconds.
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Unread postAuthor: beebs111 » Wed Oct 04, 2006 4:37 pm

i wouldnt trust your life to something that you made, just fyi it hurts alot when your shin bones go through your kneecaps
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Unread postAuthor: djt » Wed Oct 04, 2006 5:24 pm

he said he would do it over water.... but yeah its still not going to feel to good if you dont land in the water right.
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Unread postAuthor: Pete Zaria » Wed Oct 04, 2006 5:42 pm

I seriously doubt its possible to get a chute to open in 50 feet.

Why not jump with the chute already open?

Either that, or tie a 10-foot string to the top of the chute, and the other end to a solid object where you're going to jump, so when you get 10 feet down, it pulls the chute open? However, you'd need string strong enough to pull the chute, but weak enough that it'll break when you get to the end of the string.

Just some ideas.


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Unread postAuthor: COD_FILLETS » Wed Oct 04, 2006 5:52 pm

djt wrote:it might open fast enough. i saw a show where some guy made something like this. im pretty sure he was at least 100 feet up though. but his opened in like 2 or 3 seconds.


I think it was a show called "Stunt Junkies" on the Discovery Channel. I think i remeber him making an air-ejected parachute to open up, but it was still atleast 75ft off the ground.
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Unread postAuthor: cannon freak » Wed Oct 04, 2006 7:49 pm

If you do end up doing this I hope you have considered the fact that if you were to get caught up in the chute once you hit the water you could drown, you can't really wear any flotation gear so just be really careful.
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Unread postAuthor: M3NT4L » Wed Oct 04, 2006 7:53 pm

See the jump is no prob, as i stated b4 its only bout 50ft into WATER, thats about 18ft deep, i have done this jump previously without the parachute just jumping but i think that using aforce pushed chute it might improve air time and idk FOR FUn :roll: if it doesent work i wont die i will just fall into the water... thks 4 worrying i just need help on other proppeled chute desighns and more than anything pressure sources as stated in topic THANKS FOR THE POSTS :P
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Unread postAuthor: kris » Tue Nov 14, 2006 6:35 pm

when a object falls, it fall a 32 feet per second per second this means that every second the object will increes in 32 feet per second every second :D :D
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