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by hectmarr
Mon May 03, 2021 6:18 pm
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Re: Caselman air machinegun

You cannot see the blueprints for this weapon in the directions in the first message. Do you have them, Jack, so you can see them? Or else, do you know where they are on the web? :?
by hectmarr
Thu May 06, 2021 5:40 pm
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Re: Short question topic

I already understand it. "K" is for multiplying by 1,000.
In this specific case, 1.8K means 1.8 psi x 1000, it is 1800 psi, about 124 bar. Thanks for your answer.
by hectmarr
Fri May 07, 2021 10:27 am
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Re: Xtreme-patator

jackssmirkingrevenge wrote:
Fri May 07, 2021 10:14 am
Voila with a 1 meter barrel:

Image

50cm barrel gives 319 m/s and 43J, 66cm gives 356 m/s and 53J
wow is supersonic!! :o
by hectmarr
Fri May 31, 2019 9:49 am
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Re: Timed Valve vs Dump Valve for more power and efficiency

Just that. My analogy is with a subsonic turbojet nozzle, which ejects the gas with a lot of pressure in the outlet area of the nozzle, it does not have as much speed or performance as a nozzle that causes the pressure to drop to values close to atmospheric pressure. In the first case, the velocity ...
by hectmarr
Fri May 07, 2021 2:23 pm
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Re: Xtreme-patator

wow is supersonic!! :o I imagine some of your creations also exceed the speed of sound ;) even though your projects focus mostly on function and not maximum performance. It is possible although I don't really know. I have shot 6mm bb of 0.23gr plastic, with my hybrid gun at 7X, and I think it is mo...
by farcticox1
Sat May 08, 2021 1:11 pm
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Re: "In the world of spuds today"

How about 85,000psi
by farcticox1
Sun May 09, 2021 11:23 am
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Re: "In the world of spuds today"

Apparently it was a "hot" loaded round, he was very lucky that one of those lugs didn't kill him. That's what he thought, but there was a bit more going on. The sabot material was building up in the barrel, and the signs where there, he did say the shots were going off target and the recoil felt di...
by Skywalker
Thu May 13, 2021 6:57 pm
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Re: "In the world of spuds today"

https://media-exp1.licdn.com/dms/image/C4D22AQE-OLrsX-uJUA/feedshare-shrink_800/0/1620891745542?e=1623888000&v=beta&t=Kbml65sjTyKUzWdow98xZH9aqoBRdawD3QQfYGoqHS8 "22 metre £1.1 million hyper-velocity gas gun. 100 g projectile, which can reach a maximum velocity of 6.5 km/s using 3 kg of gunpowder. ...
by hectmarr
Mon May 17, 2021 3:32 pm
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Re: Counter balanced hammer valve issue

I agree with your analysis. This way you won't have the problem, but an o'ring is necessary.
Untitled.png
by wyz2285
Mon May 17, 2021 2:28 pm
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Counter balanced hammer valve issue

Untitled.png So I built a fairly well made counter balanced valve. Exhaust 7mm diameter with 9mm piston. Then I compared it to a conventional hammer valve with 6mm exhaust diameter and a shaft of 4mm. Turns out the balanced valve was weaker. My hypothesis is once the valve is cracked open, the pres...
by Doctore
Mon May 24, 2021 7:50 pm
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Two Italian WW2 helmets found

Now I am hooked.. Yesterday I found two Italian WW2 paratrooper helmets on a slope of a local mountain. This region where I live was under Italian military occupation from 1941 until Italy capitulated in 1943. Judging by the shape, I am pretty sure they were manufactured for paratroopers. My grandfa...
by saveitforparts
Sat May 22, 2021 9:49 am
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Re: Potato Howitzer

sorry for reviving an old thread but maybe there is some kind of update on the current status of this project No problem! I don't check this forum often enough, sorry :-P Here's a follow-up where I did some side-by-side testing with other designs. We tried being somewhat scientific so the last half...
by D_Hall
Sat May 22, 2021 4:46 pm
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Re: Any official studies of Hybrid Cannons?

This is one of the few examples I remember of a publicly available paper from Utron's contracted government research project for a "Combustion Light Gas Gun" (CLGG) - A.K.A. a badass hybrid that many strived here to get close to. Full paper here: https://apps.dtic.mil/sti/pdfs/ADA462130.pdf There i...
by jrrdw
Mon May 24, 2021 5:21 am
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Re: Identifying an old launcher (picture attached)

There's no picture. I think you're talking about this cannon.