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M107 project

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: JDP12 » Mon Apr 18, 2011 4:25 pm

hmm.. So basically the bolt head slides over the barrel, and when it is pulled back, the barrel is exposed?

Interesting concept, personally I like POLAND_SPUDs, but yours probably works just as well
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Unread postAuthor: POLAND_SPUD » Mon Apr 18, 2011 6:04 pm

If it has to look like M107 then yours is probably better
Mine would make more sense for a Barrett M95 replica, since it is loaded from the back
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Unread postAuthor: Technician1002 » Mon Apr 18, 2011 7:16 pm

I think the valve design looks more like a toolie valve than a short piston QDV. The operation is similar. The big differences is piston length and diameter. The OD of a QDV is the same as the barrel I'D. The seal is on the piston OD, not piston face like a toolie. In a QDV, the barrel goes through the entire length of the chamber and the spool shaped piston fits inside that.

http://www.spudfiles.com/spud_wiki/index.php?title=Toolies_Piston_Valve
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Unread postAuthor: qwerty » Tue Apr 19, 2011 2:53 am

After finishing my 2meters wingspan rc airplane and not being able to fly it because of the goddamn wind


Got picks? I make RC planes too :)
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Unread postAuthor: Demon » Tue Apr 19, 2011 6:48 am

Got picks? I make RC planes too


The reason why i want to build this M107 replica is because my RC plane (completly all homemade that waits its maiden flight) is out of access for two weeks :(

Q.D. fittings can't be disconnected under pressure, can they ?
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Unread postAuthor: the unit » Tue Apr 19, 2011 7:44 am

Technician1002 wrote:I think the valve design looks more like a toolie valve than a short piston QDV. The operation is similar. The big differences is piston length and diameter. The OD of a QDV is the same as the barrel I'D. The seal is on the piston OD, not piston face like a toolie. In a QDV, the barrel goes through the entire length of the chamber and the spool shaped piston fits inside that.

http://www.spudfiles.com/spud_wiki/index.php?title=Toolies_Piston_Valve


I also thought from what I could gather this is a toolies valve, with mechanical actuaction as oppose to pneumatic.
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Unread postAuthor: Demon » Tue Apr 19, 2011 7:48 am

But can a Quick Disconnect be disconnected under pressure ?
Knowing that will modify my plans, so i need to know.

My guess is that i can't, since the two mating parts want to expel each other but are kept together by 4 steel balls. So the friction will make it impossible to take off under pressure.
Amiright ?
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Unread postAuthor: Crna Legija » Tue Apr 19, 2011 8:04 am

yes they can but at 250+psi its near impossible. and only the female park will hold pressure back.
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Unread postAuthor: Demon » Tue Apr 19, 2011 8:13 am

So higher the air pressure, the harder it gets ?
At 150 PSI, is it possible to disconnect the two without ripping the gun appart ?
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Unread postAuthor: Gun Freak » Tue Apr 19, 2011 6:55 pm

Demon wrote:So higher the air pressure, the harder it gets ?
At 150 PSI, is it possible to disconnect the two without ripping the gun appart ?

It will be very difficult...
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Unread postAuthor: warhead052 » Tue Apr 19, 2011 8:03 pm

It may not suit your needs, but add a ball valve inbetween the QD and the air chamber. When you shut the valve, it releases the pressure on the QD and makes it easy to pop off.
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Unread postAuthor: ramses » Tue Apr 19, 2011 8:08 pm

Not really, depending on your quick connect. I use ball bearing quick connects and they are still almost one handed at 150 PSI.
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Unread postAuthor: Demon » Thu Apr 21, 2011 9:53 am

It will be fine i will put a ball valve on the pump to depressurize the system.

Here is some progress :
The yellopw thingy is the no-return valve and Q.D.
The CPVC pipe is the air chamber, barrel to the left, trigger to the right (the trigger will be rigged to be installed to the left).
The pump is the only thing left to do. The seal right now is total at lung pressure, so everything is alright !
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Unread postAuthor: Demon » Fri Apr 22, 2011 7:50 am

Hello again

The pump works perfectly, but I can say as much of the QDV ...
The piston head won't seal, and the o-ring slide lets air slip trough. It should not be hard to repair tough, it will only take time.

Here's Teh pump :
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Unread postAuthor: warhead052 » Fri Apr 22, 2011 9:36 am

Nice job. It looks awesome, does the ball valve help?
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