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m72 nerf launcher

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Davidvaini » Mon May 26, 2008 7:43 pm

hmm the tube in a m72 is 40mm correct? if so then thats around 1.5 inches which is too small for the mini nerf rockets which are 2". people have duck taped or shaved off some of the nerf rocket.
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Unread postAuthor: martyr_maker » Mon May 26, 2008 7:47 pm

its actually around 66mm. The 2" pipe fits in fine but the fittings do not. That, among other things, is the biggest problem spot.
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Unread postAuthor: brplatz » Mon May 26, 2008 7:49 pm

http://www.spudfiles.com/forums/viewtopic.php?t=19&

this guy had some sweet stuff. check it

kinda similar
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Unread postAuthor: Stifler69 » Sat Jun 14, 2008 8:19 pm

Hey,
yeah i was also planning to make something like that and i was searching around on the internet and i found some really helpful pictures....

http://hackedgadgets.com/wp-content/_ho ... cket_4.jpg
http://www.arniesairsoft.co.uk/articles ... age011.jpg

i really like the last on even though its really basic, its the best design i think for a rocket launcher.... all concealed with-in the plastic or metal chanber..

hope any of this helps
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Unread postAuthor: Stifler69 » Sat Jun 14, 2008 8:21 pm

Hey, great to have another eager spudder.

yeah i was also planning to make something like that and i was searching around on the internet and i found some really helpful pictures....

http://hackedgadgets.com/wp-content/_ho ... cket_4.jpg
http://www.arniesairsoft.co.uk/articles ... grenades_p art2_files/image011.jpg

i really like the last on even though its really basic, its the best design i think for a rocket launcher.... all concealed with-in the plastic or metal chanber..

hope any of this helps
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Unread postAuthor: freder » Sun Jun 15, 2008 7:33 am

Hey I found a good instruction for this http://www.instructables.com/id/SNDUTCQFD80X5HN/

But I think it could be pretty hard to make it^^
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Unread postAuthor: martyr_maker » Sun Jul 06, 2008 6:15 pm

First off, thank you all for the advice. I really appreciate the help.

Second off, anybody attempting to do something similar to this with an inert m72 I want to warn that it is EXTREMELY difficult!

Now to the issue at hand. I went the coaxial route that was suggested early on.
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Unread postAuthor: martyr_maker » Tue Aug 12, 2008 8:12 pm

I have everything in the drawing above assembled and the m72 tube gutted but i just cannot get the piston valve to work. I made the piston out of a 1" pvc cap wrapped in duct tape with a piece of gasket material to seal onto the inner barrel.


Image

Since this picture was taken i changed out the gasket material for a better cut piece. The problem now is that i can rarely get the piston to seal correctly and even when it does the piston doesn't actuate when i empty the pilot.

After some research it seems that the reason it doesn't actuate right lies in the blowgun valve but because of the look and operation i want this launcher to have i really would prefer to use a blowgun over a ball valve or a sprinkler valve hanging out the back.

So is there anyway to compensate slower exhaust by using a lighter piston?
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