What I think, I mean to evaluate the possibility of this, is to use a superheater to accelerate the propellant fluid more than the pressure of the reservoir can do it for a given pressure. In the tube of an afterburner, the pressure does not increase almost, only the speed of the air energized by te...

It goes something like this roughly Afterburner BBMAG.png The gun trigger activates and deactivates the main valve and the ignition simultaneously. The flame holders are for the flame to anchor in that area because if there is not, everything can go out without control. The device only gives more sp...

One possibility to organize the bbs and save air, is as follows. The holding oring only releases the bb when it reaches set pressure, and immediately another bb seals the outlet. Sealing time is what it takes a 6mm bb to travel 6mm, aided by the suction of the barrel. The firing frequency is regulat...

Here are some very old (2004!) Concept drawings

Interesting concepts shown in the drawings. Which of these did you try? Which one worked best? I am interested in trying to include a tank of bbs to my machine gun, to feed the magazine (s).

I like the way it shoots. It has enough energy, apart, ideal for hunting pigeons or something like that. I'm looking at the mechanism, to understand.

This system worked perfectly for me, which is what makes 25 bb's of lead rise, caliber .22 in my replica of MAC 11. https://www.spudfiles.com/viewtopic.php?f=29&t=26856I used a small flow regulator to regulate the amount of air that rises through the tube that it keeps ammunition. What I don't like ...

ok I understand. I plan to use around that pressure that you use, 7 or 8 bar, because much more is more complicated for me. In the future I will build it. Good idea of yours to arrange the tube that houses the balls at an angle, because it is comfortable and aesthetically good. Placing it at 90º wit...

A piston valve works well, and you can build it yourself. Actually, it is quite simple.
viewtopic.php?f=26&t=8157
spud_wiki/index.php?title=Piston_valve
This type of valve releases the air very quickly.

The gun looks nice, in general. How do you plan to measure the air-fuel mixture? On the other hand, keep in mind that the copper barrel is not very solid at 300 psi, and it is under high pressure ... if you can get a tube of steel, that is better. I have tried it with a 7X hybrid copper tube, in .25...

Try to cover the muzzle of the firing cannon with a piece of tape. It is not a question of introducing anything, rather of obstructing the muzzle of the barrel with plastic tape. When you fire, with its standard ammunition, the tape will soften and the projectile will come out freely, but that cause...

Moonbogg wrote: ↑

Thu Apr 22, 2021 2:29 pm

150-300psi pre pressure is what, 10-20x roughly? Definitely use steel for everything. Other than that, it looks pretty nice!

Yes, between 10 and 20x

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?

jackssmirkingrevenge wrote: ↑

Tue May 04, 2021 8:03 am

pdf here: https://archive.org/details/Caselman_Ai ... 9/mode/2up

another version: https://ia800207.us.archive.org/18/item ... prints.pdf

Cool! Thank you.

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.

jackssmirkingrevenge wrote: ↑

Fri May 07, 2021 10:14 am

Voila with a 1 meter barrel:



50cm barrel gives 319 m/s and 43J, 66cm gives 356 m/s and 53J

wow is supersonic!!