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spring loaded grenade launcher

#1 User is offline   Khaotik 

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Posted 25 March 2011 - 04:49 PM

I want to fabricate an under barrel grenade launcher that utilizes extension springs and can lob a fatboy grenade thirty or more feet I was thinking a pvc construction but am open to ideas any help would be hot. Thanks
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#2 User is offline   Down Range Pain 

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Posted 25 March 2011 - 06:13 PM

very thin material could be used for the tube, without pressurized air or anything in it. that would let u use larger
springs i guess
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#3 User is offline   Private Silver 

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Posted 25 March 2011 - 10:44 PM

But, it's going to need to be strong enough to take the strain of having that decent of a spring letting go inside of it. Which that brings up another point, you sir, are going to need one hefty spring to lob a fatboy 25+ feet. And would this be a one or 2-piece construction?

One way i imagine may be possible is to imitate something such as the M203, and do a tube-in-tube design, however it will be somewhat hefty as that point, and just have the spring mounted to the rearmost pipe, and have the outer pipe slide off far enough to insert a fatboy. However, one way to make it a bit smaller would be to have it set up so that you compressed the spring first, THEN slid the outer tube forward, letting you shorten the inner tube as it would only have to theoretically be as long the the spring is when compressed, letting you make the over-all build a little smaller.

Huh, i can honestly picture the blue-prints in my head. Perhaps not to scale, but the rough idea and design is there....just ask if you want me to draw and post 'em.


Hrm....good luck with that heavy a spring though, I don't know where I would even begin to look for one.

This post has been edited by Private Silver: 25 March 2011 - 10:46 PM

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#4 User is offline   Eskimo 

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Posted 25 March 2011 - 10:46 PM

pssh, if your going for a non mech way to fire a fatboy get a catapult!
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#5 User is offline   shadow_772 

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Posted 27 March 2011 - 08:01 PM

View PostEskimo, on 25 March 2011 - 11:46 PM, said:

pssh, if your going for a non mech way to fire a fatboy get a catapult!

Correction: Top rail mounted catapult.
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#6 User is offline   Orpackrat 

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Posted 28 March 2011 - 06:02 PM

Springs have been brought up before, it wont be too practical.

If you really want to experiment with this concept, instead of springs, get yourself some heavy duty latex tubing. You will probably have better luck getting it to work with the latex tubing, it would be lighter, cheaper, and more forgiving.
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#7 User is offline   I.K.E. 

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Posted 28 April 2011 - 04:49 PM

30 feet is pretty far! Besides, couldn't you throw it further than that? And more accurately? I mean, I can see putting a cosmetic launcher on for the look....but for function, it should be something that performs better than you could on your own.

Alternately, talk to Dvlchld about smaller, lighter grenades. He might be able to help you figure something out.
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#8 User is offline   Scavies 

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Posted 08 June 2011 - 05:33 PM

Tried it before. The issue with a spring launcher is that the only force available to launch the grenade is the force you can exert to compress the spring. If you can find a way to get some mechanical advantage (ie gears, levers, screws), then I can see it working. If not, I wouldn't waste your time IMHO.
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#9 User is offline   Scavies 

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Posted 08 June 2011 - 05:34 PM

View PostOrpackrat, on 28 March 2011 - 09:02 PM, said:

Springs have been brought up before, it wont be too practical.

If you really want to experiment with this concept, instead of springs, get yourself some heavy duty latex tubing. You will probably have better luck getting it to work with the latex tubing, it would be lighter, cheaper, and more forgiving.


Definitely. How about this bro? Get a hunk of pvc, attach two ends of latex tubing to the front, pull the middle to the back of the tube, then place the grenade in front of it.

Wallah, you now have a grenade slingshot.
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