What
Fps or mach number range did you do the design for.

Maybe Just do a vacuum cannon.
Be simplest.
Plunger, Aluminium foil for burst disk.
Use a ping pong ball or tennis ball.
Be more in the "high school" theme.
Safer for demonstration.
Just my two bobs.

Doc j wrote: ↑

Thu Jul 02, 2020 12:03 am

How would hollow cylinder and sabot go.
Someone's thought about it.

Aperently, This design, unless gets mach 3 and over.
Creates a dome shock infront.
Dunno if much be gained from it
From lower herbs.
Interesting non the less.

Ended up getting Ggdt. To work On desktop pc. First time having a play around. Working off the above, Punched in details. On paper, Went to 1/8 th of cylinder start volume went x8 pressure 116psi. Gave only 18% better fps. (+33fps) Than the 14.5 psi on full cylinder volume. Helped can that direction...

If you have the same air volume and the chamber is 1/3 the volume, the pressure will increase by 3x. https://www.omnicalculator.com/physics/boyles-law Interesting to note. Apllying my reasoning, punch into calculator. As cylinder reduces in volume. increases the pressure to compensate for The loss ...

How would hollow cylinder and sabot go.
Someone's thought about it.

My progress. Haha.... Mini... incremental. Just to see how it goes, I Pulled out piston. Put Schrader valve bottom handle , used foot pump. Didn't work at lower pressures. 70 to 90 psi did. It air hungry, pretty much whole volume gone in one pull. I changed spring and length in back of piston valve ...

Are you working on something that you had a question about? I lost sight of what you were trying to do.
[/quote]

Yeah,
I posted "air stapler"
In another topic.

For simplistic sake it might end up manual bolt yet.
Might try blow forward later.

Talking about both volume and pressure. For a determined Barrel to cylinder / chamber ratio. Without changing barrel volume. Just working on cylinder and pressures to volume. I could be wrong too, seen somewhere take 1 bar off regulated pressure gives actual reg pressure. In that case suppose adjus...

If you have the same air volume. You mean same pressure. That calculator shows if compress 21. 5 psi to A third of its volume increases presurre x3 No you don't have same volume. But Yes a higher pressure. Thats where I get confused and was saying. Regulate pressure at higher to compensate for loss...

Hi. Got a cylinder volume to barrel ratio. Want to use on diff build. I got it from a AEG. Crono found sweet spot. For diff build using air pressure. Not spring. If I up the psi, would that mean to use a smaller chamber./ cylinder. Bare with me. Worked out cylinder volume. To Guestimate pressure Goi...

Gettin lost in What proposed to do. If drive piston quik. Would this work. Disregard. Force output would be significantly less. Guess at : If was 30mm I'd cylinder at 7 bar equates to 495 newton's output force shaft. . If piston became valve I'd. At 7mm cylinder I'd. Out put be 30.9 newton's using ...

Gettin lost in
What proposed to do.
If drive piston quik.
Would this work.

https://i.imgur.com/IXFQ1Ji.jpg A good diagram of how it works Thanks. Found another, explains the small holes in cylinder for piston return, in that diagram nailer is fed from Seperate chamber. I think could do, hav to block above the trigger. Makes the around white plastic storage pressure volume...

This was bit of inspiration.
For build.