2031 FPS on air . Latest shot, 2162 FPS

[pneumero uno]

pneumero uno,
If you start shooting at 220 bar (3190 psi) and finish at 100 bar (1450psi) and get 3 shots 15.89 gn averaging 1165 fps, that gives an air efficiency of about 1.6 fpe/cuin.  That is very good.  Here is the calculator, but you have to convert the pressure to psi

 
The 1135fps at 110 bar is also very nice!
Lloyd

That was certainly  quite a blast . I was wrong. The fill pressure is 200 bar. I removed the internal controlling device so that all the air was dumped on one shot. The volume was slightly increased as a result. Velocity was 1363 fps with 15.89 JSBs.

That is one fast JSB!   
Lloyd

Thank you Lloyd but I don't think it would have the usual JSB accuracy . Rather unpleasant with all the blast too. Nowhere near your outstanding achievements but as you know it was done to prove a point, and failed . The experiment with the controlling device was done at 200 bar not 220 as that was the dive bottle pressure so the test could be repeated. It uses little air. Will have to get a 300 bar tank

[lloyd-ss]

Thats a nice one Loyd, can't believe I have missed this thread. That is quite clever on holding the pellet and not using a valve.
I shot some 8gr plastic sabots out of my 357 with helium and we clocked them around 845m/s at the muzzle. Just to see how fast they can fly. Have a pic of the a chrony session somewhere hafto try and find it.
I do like these experiment threads, keep them coming.

Marko

Some folks might say that these posts that built around totally impractical devices are pointless. But there is always something new to learn.
Lloyd

[rsterne]

If any of you have a powerful .25 cal PCP, something about 100 FPE or more, and want to try exceeding 1650 fps yourself, check out Reply #490 in this thread...

http://www.gatewaytoairguns.org/GTA/index.php?topic=102604.480

I used my .25 cal Disco, tethered at 2900 psi, to drive a tinfoil wrapped airsoft BB at over 1750 fps.... with NO changes to the gun.... 

Bob