600 psi 3/4" QEV Launcher
Hey, this is my new launcher and here are the specs
Barrel: 15mm copper 1.3m long
Chamber: 22mm copper 1m long (I know they are a little small for the size of valve
Valve: 3/4" QEV
Pilot Line: 30cm of 8mm copper
Pilot Valve: Blowgun
Operating Pressure: 100-600 psi
Ammo: 11.1mm steel ballbearings
Damage: Have been able to shoot the 11.1mm ballbearing through the 2" part of a 2x6 at 500 psi from about 20 yards away (Long range in spudgun terms with no sights, for me anyway)
This launcher is VERY close in FPS and FT/LBS to a .38 special
The 600psi reached is from my fridge compressor
The ammo
The Launcher
And the destruction to the 2x6 at 500 psi
The 2 holes in the centre of the pic
Barrel: 15mm copper 1.3m long
Chamber: 22mm copper 1m long (I know they are a little small for the size of valve
Valve: 3/4" QEV
Pilot Line: 30cm of 8mm copper
Pilot Valve: Blowgun
Operating Pressure: 100-600 psi
Ammo: 11.1mm steel ballbearings
Damage: Have been able to shoot the 11.1mm ballbearing through the 2" part of a 2x6 at 500 psi from about 20 yards away (Long range in spudgun terms with no sights, for me anyway)
This launcher is VERY close in FPS and FT/LBS to a .38 special
The 600psi reached is from my fridge compressor
The ammo
The Launcher
And the destruction to the 2x6 at 500 psi
The 2 holes in the centre of the pic
Nice, but I'm going to reiterate a point that's going around a lot currently. UK copper is not as thick walled as US copper, so my personal recommendation is that using any bore size past 500 psi is unwise.
So for those reasons, I suggest you stick to 500 psi - at least, if you want your launcher to remain in one usable piece.
So for those reasons, I suggest you stick to 500 psi - at least, if you want your launcher to remain in one usable piece.
Does that thing kinda look like a big cat to you?
I personnaly wouldn't push it to 600 psi...still, simple design, well made, effective placement of the required parts...a very nice job ^^ congrats Dave
.38 special is almost equivalent to a .45 black-powder revolver (I know it by experience), so i bet you get considerable power
moar damage, moar pics, moar vids !!!!
.38 special is almost equivalent to a .45 black-powder revolver (I know it by experience), so i bet you get considerable power
moar damage, moar pics, moar vids !!!!
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
- sniper hero
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cool simple design
wow high pressure
and a vid would be o great:D:D
good work
wow high pressure
and a vid would be o great:D:D
good work
proud member of dutch spud clan
coming: semi auto pellet sniper:D
coming: semi auto pellet sniper:D
Hmm, just noticed something.
Are you using hydraulic hose and couplings to connect your compressor? I couldn't say about the quick connect but the hose looks like the black, wire reinforced stuff I'm thinking of.
Are you using hydraulic hose and couplings to connect your compressor? I couldn't say about the quick connect but the hose looks like the black, wire reinforced stuff I'm thinking of.
That looks powerful. You should look into that big pilot volume though.
Do you keep the hose connected when firing?
Do you keep the hose connected when firing?
Personally, I have only used it at 600psi once and since reading your posts rag, I ony use it at 500psi. Plus the climb from 500 to 600 is a bit too much for me to wait.
The hose is a 5800 psi hydraulic hose, The quick connect it a standard one for an airline, however it is only presurised when filling, when I dissconnect it, it leaks alot so I just push it back onto the male quick connect without pulling back the collar which releases the pressure in the hose.
I would not put any more pressure in it, end of. Have you got a fetish for high pressre maggotman?
Pilot volume is reduced as much as I want it. it is only about 9 cubic cm
Will definatley get some more damage pics and vids, any target ideas?
Dave
Any more questions?
The hose is a 5800 psi hydraulic hose, The quick connect it a standard one for an airline, however it is only presurised when filling, when I dissconnect it, it leaks alot so I just push it back onto the male quick connect without pulling back the collar which releases the pressure in the hose.
I would not put any more pressure in it, end of. Have you got a fetish for high pressre maggotman?
Pilot volume is reduced as much as I want it. it is only about 9 cubic cm
Will definatley get some more damage pics and vids, any target ideas?
Dave
Any more questions?
- Fnord
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I don't think I'd trust a blowgun to 600 psi. If the blowgun fails, the gun fires. If you don't want to change it, I'd suggest putting a 3/8 or 1/2" ball valve between the QEV and the barrel as a safety. Good work other than that.
Also, I swear that's the same type of 1/4" ballvalve I just bought from ebay a while back. Nickle plated brass? I got like 10 of 'em for $20.
Also, I swear that's the same type of 1/4" ballvalve I just bought from ebay a while back. Nickle plated brass? I got like 10 of 'em for $20.
- jackssmirkingrevenge
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Excellent stuff, always nice to see people pushing the envelope
How about visiting here for target ideas, you'll know how your launcher compares to powder burners
How about visiting here for target ideas, you'll know how your launcher compares to powder burners
Cheers guys for the good responses.
Since the photos were taken, I have added a 1/4" ball valve above the blowgun. I got the ball valve from ebay aswel, they seem really common.
I have some 4-5mm thick aluminium that I will shoot, I think that some 1mm or 2mm steel might be a better test of power.
Dave
Edit: I might have to build myself Box o' truth using some 1/2" plywood and 1" spacers inbetween the sheets.
Since the photos were taken, I have added a 1/4" ball valve above the blowgun. I got the ball valve from ebay aswel, they seem really common.
I have some 4-5mm thick aluminium that I will shoot, I think that some 1mm or 2mm steel might be a better test of power.
Dave
Edit: I might have to build myself Box o' truth using some 1/2" plywood and 1" spacers inbetween the sheets.
Assuming this is the more commom, thinner walled table X copper pipe, you are a good 100psi below the max. working pressure (~750psi) and significantly below the burst pressure. But don't take my word for it or anybody elses, work it out for yourself, the link below (page 6) shows how to calculate the maximum working pressure for copper pipe, you just need the condition (usually half-hard) and the dimensions.
http://www.cda.org.uk/megab2/build/pub- ... rvices.pdf
As mentioned by others I would be much more worried about the fittings or blowgun failing, not to mention making sure whatever you fire out of the thing doesn't end up going through you or somebody else.
Nice cannon though
http://www.cda.org.uk/megab2/build/pub- ... rvices.pdf
As mentioned by others I would be much more worried about the fittings or blowgun failing, not to mention making sure whatever you fire out of the thing doesn't end up going through you or somebody else.
Nice cannon though
- jackssmirkingrevenge
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Valid advice, at these power levels one needs to be extremely sure that one has a good backstop that doesn't allow ricochets.spudamine wrote:not to mention making sure whatever you fire out of the thing doesn't end up going through you or somebody else.
This was a ball bearing ricochet at just 110 psi, f'r chrissakes be careful.
- frankrede
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I had a ricochet off the sidewalk from a co2 bb pistol shatter my sliding glass door. Its really ridiculous, cost me $300 to replace.jackssmirkingrevenge wrote:Valid advice, at these power levels one needs to be extremely sure that one has a good backstop that doesn't allow ricochets.spudamine wrote:not to mention making sure whatever you fire out of the thing doesn't end up going through you or somebody else.
This was a ball bearing ricochet at just 110 psi, f'r chrissakes be careful.
Current project: Afghanistan deployment
I like it! it looks just like HOTWIRED's cannon, very simple yet still aesthetically pleasing, and with 600 psi you are going to knock the socks off of any target (not to suggest that the target wears socks, IE is human...)
Great work mate!
Great work mate!
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