| Can I ever top the sawed-off?? |
| You just did..I think |
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66% |
[ 14 ] |
| Nothing can top the sawed-off |
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28% |
[ 6 ] |
| I ( that's you!!) can do better |
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4% |
[ 1 ] |
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| Total Votes : 21 |
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| Brian the brain |
 Posted: 06/19/2007 13:48 PM Post subject: "OVERKILL"UPDATE: onboard CO2 and camo! |
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Dutch Spud Clan Leader
Joined: 05 Dec 2005
Posts: 1339
2233.28 Spud Bux
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cannon name: OVERKILL
type: pneumatic
valve: homemade high performance piston, due to tapered diaphrams.
1"outlet
caliber: 47mm ( just under 2")
operating pressure: 26 bar ( 370 psi)
might upgrade with CO2 to 30 bar ( but I'm afraid that would break the solenoid valve)
EDIT: CO2 bottle is now onboard.Soda stream reg ( modified with double spring) goes up ( and a little over) 300 psi or 21 bar
exhaust: modified brass solenoid valve ( 1/2"), pneumaticly actuated by
pressure washer handle.
UPDATE: hose has been replaced by hardline, wich has better flowIt's taken me a while, but I finally finished overkill in a "look" I like.
It's constructed out of steel ( and some brass) fittings.
The valve is more than adaquate for the barrel size.
It's a lot louder than anything I've built before, and the valve is actuated noticably faster than the ones I made before.
even more so now I replaced the hose by hardline
I chose flat army green for the paintjob, because of it's rawness compared to camo.It gives it a kinda sovjet-feel.
The weapon is meant to be held in a mini gun fashion, because I wouldn't dare shoulder this thing!!!.
A pro is, this way it's shorter, wich makes it usable in CQB.( some of you know what I mean)
Dunno what else to tell you guys.It's extremely overpowered for such a "small"cannon.
It's nothing to inovating, just all metal, so capable of handling "insane pressure", as I have been said to use.
I've only done dry fires, ( old info!!)but I know this stuff, so ...well...I know.
I'll take it out for a test ride this weekend.Just spuds for now...
| Description: |
| overall view.Barrel is aluminium, both lightweight and smoooooothhh. |
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| Filesize: |
94.16 KB |
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84 Time(s) |
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| Description: |
| Close-up of the working bits...piston valve INSIDE the Tee, modded brass solenoid valve, pressure washer handle. |
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75.1 KB |
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60 Time(s) |
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| Description: |
| View from above.handle will get a black rubber grip, if I can get it to fit. |
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78.39 KB |
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45 Time(s) |
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| Description: |
| here you see the modded brass solenoid valve.Never knew a piston could be actuated THAT FAST!!! |
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72.47 KB |
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47 Time(s) |
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Last edited by Brian the brain on 10/07/2007 14:35 PM; edited 4 times in total |
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| PVC Arsenal 17 |
| Posted: 06/19/2007 14:04 PM Post subject: |
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WITTY PHRASE
Joined: 27 Mar 2006
Posts: 1259
825.23 Spud Bux
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Another beast courtesy of BTB. Nice work. Excellent paintjob especially.
And where'd you get the solenoid?
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| MrCrowley |
| Posted: 06/19/2007 14:06 PM Post subject: |
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Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 6187
3319.40 Spud Bux
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Woah, That is HUGE! For a moment I thought your pressure washer was a glue gun  How heavy is it?
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| Velocity |
| Posted: 06/19/2007 14:16 PM Post subject: |
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Brigadier General
Joined: 07 Feb 2006
Posts: 1011
83.82 Spud Bux
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...that...is....incredible! I thought your original Overkill was OK... but this is 1000X better!! Congratulations on yet another incredible build!
EDIT: One question... why not step up the valve porting to 1.5" instead of 1"? Not only would this have greater flow (increasing performance), but because barrel sealers actuate faster when the barrel port diameter is closer to the piston diameter, that would further improve performance.
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| Brian the brain |
| Posted: 06/19/2007 14:18 PM Post subject: |
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Dutch Spud Clan Leader
Joined: 05 Dec 2005
Posts: 1339
2233.28 Spud Bux
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I found the solenoid on a flee market.I tend to visit them a lot lately.
I love those rare finds, solenoids are one of those in my country.
It's not that heavy.Chappy was heavier, but about 3x the size.
Happy I'm back in the game...This thing gave me the hardest time ever.
Notice the elbow from the reservoir into the tee...It's not supposed to exist..
I took apart a 3-part repair fitting to create that tight barrel-reservoir look.
The elbow has 2"threading on one side, but straight, not tapered like the rest.It was hell to get it to seal.( thank god for high grade silicone based construction glue!!)
About everything took a lot of extra work on this one.I'm especially happy with the pistonvalve fitted completely in the Tee, cutting down bulk-wardness, and the very "proffesional "valve mod.Never done that before.
I hope it doesn't snap my wrists as some of you have suggested.
Thanks for the comments!!
EDIT: Rmich, I'm well aware of that.I just can't get one under 100 bucks..
If I ever find one I'll certainly use it!!( I'll find one, trust me)
I was surprised the 1/2" one works so well.I too would have chosen a 1"one if I could.
MORE EDIT:
OOPS I misread.THe porting could be 1 1/4 at the most.I use a pipe-nipple ( piece of pipe) threaded into the inside of a reducer, to create a housing for the piston inside of the tee.
1 1/2 would be the piggest pipe that would fit inside, therefore the port can't be bigger than 1 1/4"
The inside of the tee is not suited as the piston housing, the threaded part is narrower than the inside.A reducer with an inverted pipe was the answer.
I can't get a 2-1 1/2"reducer at the moment, but I eventually will "upgrade"to 1 1/4"porting.
Last edited by Brian the brain on 06/19/2007 14:35 PM; edited 1 time in total |
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| Velocity |
| Posted: 06/19/2007 14:30 PM Post subject: |
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Brigadier General
Joined: 07 Feb 2006
Posts: 1011
83.82 Spud Bux
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Brian, I was referring to the valve outlet. A 1/2" pilot valve is certainly suitable for a purpose like this; sure, stepping it up in size might improve performance very slightly; however, the difficultly in finding one and the small improvement in performance (not to mention the price) make upgrading it impractical.
Right now, the outlet on this valve is 1"; I was suggesting upping this to 1.5", for the reasons stated above. However, I suppose I do not fully know how the inside of the valve is set up, so there is a chance it wouldn't work.
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| Brian the brain |
| Posted: 06/19/2007 14:38 PM Post subject: |
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Dutch Spud Clan Leader
Joined: 05 Dec 2005
Posts: 1339
2233.28 Spud Bux
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read above double edit.I misread.
You are completey right on both occasions.
Bigger outlet would yeald better performance, and, it's not entirely possible..( 1 1/4" is!!)
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| spudthug |
| Posted: 06/19/2007 15:15 PM Post subject: |
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Gangster Kitten
Joined: 26 Feb 2007
Posts: 974
609.33 Spud Bux
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wow btb this is amazing! this is by far your biggest gun yet..
is the solenoid rated to 300+ psi? i thought they were rated to like 15-19 bar or something...
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| Gepard |
| Posted: 06/19/2007 15:24 PM Post subject: |
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Major
Joined: 18 Jun 2007
Posts: 352
727.71 Spud Bux
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Can I ask why you say "high performance piston" - what makes it high performance?
How do you pump it up to 26Bar? Do you have a HP air supply?
I'll leave out the 'wow that's awesome' 'til I see the damage pics 
Michael
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| spudthug |
| Posted: 06/19/2007 15:28 PM Post subject: |
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Gangster Kitten
Joined: 26 Feb 2007
Posts: 974
609.33 Spud Bux
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| Quote: | | Can I ask why you say "high performance piston" - what makes it high performance? |
| Quote: | | homemade high performance piston, due to tapered diaphrams. |
wow right in plain sight....
| Quote: | | How do you pump it up to 26Bar?Do you have a HP air supply? |
you answered it yourself...a pump and bouncer muscles
| Quote: | | I'll leave out the 'wow that's awesome' 'til I see the damage pics |
u must not know btb.....look up his shotguns..go to search and put his name in, go to pneumatic cannon showcase..look at all guns made by btb...
do u know what 300+ psi can do?!!?
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| Brian the brain |
| Posted: 06/19/2007 15:35 PM Post subject: |
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Dutch Spud Clan Leader
Joined: 05 Dec 2005
Posts: 1339
2233.28 Spud Bux
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Yee of little faith!
Two posts and you question MY abilities??
Well...postcount aint everything so..
The light piston consists of a bolt and washers, holding two rubber diaphrams, wich are tapered, to allow only one way passage of air.When the pilot is exhausted, no air can leak from the reservoir out the pilot valve.
I use a modified trackpump and brute force to reach 26 bar.
Look up my "sawed-off" in the pneumatic section and know OVERKILL has 4x it's force( and a longer barrel !!)and try and doubt me then...hahaha
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| Gepard |
| Posted: 06/19/2007 15:43 PM Post subject: |
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Major
Joined: 18 Jun 2007
Posts: 352
727.71 Spud Bux
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Doesn't explicitly explain why it is high performance - that could mean that's why he is using a piston...I don't see why tapered threads make it high performance.....
Ok maybe I should have phrased it 'How do you increase the internal pressure to 26Bar' Sorry for using the shorter and less geeky version.
Surely my 'extremely' low post count would suggest that I don't....
Depends how it is realised - you ever shaken a coke bottle and unscrewed it over 5 mins compared to 1 second?
Michael
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| spudthug |
| Posted: 06/19/2007 15:49 PM Post subject: |
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Gangster Kitten
Joined: 26 Feb 2007
Posts: 974
609.33 Spud Bux
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more like bouncer muscles
| Quote: | | I don't see why tapered threads make it high performance..... |
tapered diaphragms..do understand what a diaphragm is??
| Quote: | | Ok maybe I should have phrased it 'How do you increase the internal pressure to 26Bar' Sorry for using the shorter and less geeky version. |
pumping it with a modified track pump!!!!
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| Brian the brain |
| Posted: 06/19/2007 15:50 PM Post subject: |
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Dutch Spud Clan Leader
Joined: 05 Dec 2005
Posts: 1339
2233.28 Spud Bux
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Less geaky version was better...
read up on piston valves to better understand what I've done.
You seem a little incoherent...
Have you searched my older guns as suggested?
You owe me a WOW!!
The coke thing is irrelevant.
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| Gepard |
| Posted: 06/19/2007 15:50 PM Post subject: |
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Major
Joined: 18 Jun 2007
Posts: 352
727.71 Spud Bux
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lol, sorry I've been lurking for a while and find people really exaggerate their cannons and end up like a list of synonyms for the word powerful etc.
Four now
Cheers,
Michael
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