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A parachute round?

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A parachute round?

Unread postAuthor: boyntonstu » Wed Jul 22, 2009 10:17 am

If a T shirt can be fire into the upper stands, why not shoot a patrachute straight up?

It would be nice to see a parachute floating down from 1,000 feet.

Reusable.


Very entertaining.


Make the neighbors smile an more willing to accept SG's.


I suppose someone has done it.


BoyntonStu.
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Unread postAuthor: MRR » Wed Jul 22, 2009 10:36 am

I haven't done it yet but i was thinking about a parachute camera projectile for quite a while now.

It would be shaped like a rocket with flip open fins when firing out of the barrel.

The biggest challenge is to construct a reliable opening mechanism for the parachute.
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Unread postAuthor: dudeman508 » Wed Jul 22, 2009 10:45 am

I tried it once, i have a piece of dowel that i put in my barrel with a parachute attached to the top, either the parachute didn't open or it was torn to shreds. I was using the parachutes from 99 cent parachute men though so you should give it a go.
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Re: A parachute round?

Unread postAuthor: dewey-1 » Wed Jul 22, 2009 11:19 am

boyntonstu wrote:If a T shirt can be fire into the upper stands, why not shoot a patrachute straight up?

It would be nice to see a parachute floating down from 1,000 feet.

Reusable.

Very entertaining.

Make the neighbors smile an more willing to accept SG's.

I suppose someone has done it.

BoyntonStu.


Several years ago I had posted drawings for a model rocket with chute recovery system. I even have part numbers for components of the rocket.

If you are interested just PM and I can give details.

The design does work because I used it with my kids bottle rocket projects in their junior high Tech Ed classes and they had multiple sucessful launch/recoveries.
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Re: A parachute round?

Unread postAuthor: jackssmirkingrevenge » Wed Jul 22, 2009 11:26 am

dewey-1 wrote:Several years ago I had posted drawings for a model rocket with chute recovery system.


Before you disappeared :(

But hey, you're back now, so re-post ;)
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Unread postAuthor: MRR » Wed Jul 22, 2009 11:58 am

Now that I've read the post that jsr linked to... a camera projectile doesn't sound so good anymore :( .
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Unread postAuthor: Technician1002 » Wed Jul 22, 2009 12:28 pm

The trick is deployment. I have seen a couple designs. Other than a timed charge like what is used in model rocketry, some type of delay or speed sense is needed. I have seen helicopter stick with fold down props that are held folded while in high speed and then unfold at low speed. Something like that can be used.

Another option is to launch a roll of paper with the payload and chute in the middle. When the streamer unrolls in flight, near the top the paper would unwrap the chute. This brings me to one of my favorite ammo loads for a larger cannon, rolls of adding machine tape. :D It's where I got the idea. It unrolls on the way up and finishes up high and at the peak.

Oh, for doing a camera, it's been done. The guy on http://www.crazybuilders.com has a nice video, but it had a hard landing with no chute.
http://www.crazybuilders.com/item.php?id=000004&type=project_section
It is in the video of his air cannon at about the 5 minute mark. Enjoy.
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Last edited by Technician1002 on Wed Jul 22, 2009 1:21 pm, edited 1 time in total.
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Unread postAuthor: cannon monkey » Wed Jul 22, 2009 12:31 pm

i did it once with a cow doll from a restrant place :D eat more chicken less cows 8)
any ways it just fishing line and a trash bag cut up it worked the cow went about say...40 feet then the parachute opened and flowed down fairly slow and landed softly i wanted to try it with a water ballon see if i can land it with out breakage
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Unread postAuthor: jimmy101 » Wed Jul 22, 2009 1:09 pm

Technician1002 wrote:The trick is deployment.

Actually, there are two "tricks". Deployment is one, a round that is stable in flight is another.

The water rocket folks have several ways of deploying chutes. They range from pretty darn simple (drape the chute over the nose of the rocket), to timed (using a windup toy mechanism as the timer) to speed sensing using a flap and spring, to digital control using a timer or accelerometer.

My untried design: http://www.inpharmix.com/jps/ParachuteRound.html
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Unread postAuthor: dewey-1 » Wed Jul 22, 2009 3:23 pm

Here is a 3D model of the RPG Model Rocket With chute deployment.
It is designed for 2 inch bore. OD is 1.9 inches and almost 12 inches long.

I will post more details at a later date if there is anybody really interested.



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Unread postAuthor: cannon monkey » Thu Jul 23, 2009 6:31 pm

thats it just going to drop the topic??? can sombody meet in chat room help me plan to find a way make this work?
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Unread postAuthor: dewey-1 » Mon Jul 27, 2009 12:58 pm

Here is a 2D drawing of what JSR was referencing to.
Click on it to enlarge.

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Unread postAuthor: jackssmirkingrevenge » Tue Jul 28, 2009 4:02 am

That's the one, the nose cone is held on by the forward motion of the rocket.
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