4500PSI, REGULATED, AIRGUN PROJECT

PLAYING AROUND WITH HIGH PRESSURE AIR AGAIN.
BUILT A 3 CUBIC INCH AIR CHAMBER THAT HAS A VALVE IN IT.
IT SCREWS INTO THE REAR OF THE GUN, JUST LIKE A TANK.
PIPED AIR TO THE REAR OF THIS CHAMBER USING 1/8 INCH, STAINLESS STEEL TUBING.
CONNECTED THE OTHER END OF THE TUBE TO MY COMPRESSOR AND CRANKED IN 2000 PSI.
SHOT A FEW .25 CAL, KODIAK PELLETS INTO A 2 BY 4, THEY WENT OVER 3/4 OF THE WAY THROUGH — STILL GOOD POWER WITH ONLY 2000 PSI.

SEE THE PICTURE OF THE ADJUSTABLE REGULATOR.
IT WILL SCREW INTO MY 68 CUBIC INCH, 4500PSI TANK. THEN I WILL MOUNT THE TANK UNDER THE SHROUD, AHEAD OF THE TRIGGER, AND PIPE THE REGULATED AIR INTO THE 3 CUBIC INCH CHAMBER.

COMPLETED THE 2000 PSI TEST THIS MORNING USING THE COMPRESSOR.
IT WAS SUCESSFUL, SO I ORDERED THE REGULATOR OFF EBAY FOR $22 DELIVERED.
NEXT I GOTTA SEE IF I CAN CRANK THE REGULATOR UP TO 2000 PSI.

WHEN I SHOT THE 2 BY 4, THE GUN SEEMED MUCH QUIETER.
MAYBE IT INDICATES BETTER AIR EFFICENCY – LESS EXCESS AIR BLASTED OUT THE MUZZEL. THE TUBING HAS A VERY SMALL I.D., SO THE 3 CUBIC INCH CHAMBER DOES NOT REFILL INSTANTLY, LIMITING EXCESS AIR BLASTING OUT THE BARREL??

SHOT OVER CRONY WITH VARIOUS PRESSURES. 24 INCH BARREL,31 GRAIN KODIAKS
1000PSI — 570 FPS
1500PSI — 700 FPS
2000PSI — 900 FPS
2300PSI — 940 FPS
THE VALVE / GUN COMBO NORMALY IS TUNED DOWN TO 950 FPS AT 3000 PSI (FOR ACCURACY). THIS VALVE IS SETUP FOR 3000 PSI. I AM SURE I CAN BUILD A VALVE FOR 2000 PSI THAT WILL GIVE FULL POWER, AND THEN SOME.

I BELIEVE THE 3 CUBIC INCH CHAMBER IS TOO BIG AND CAN BE CUT DOWN IN SIZE.

THE 3 CUBIC INCH CHAMBER IS BUILT FROM 1.5 INCH DIAMETER, 2024 AIRCRAFT ALUMINUM. IT HAS A .3 INCH THICK WALL, SO THERE IS PLENTY OF STRENGTH FOR 4500 PSI. USING BARLOWS FORMULA- IT SHOULD BE GOOD FOR 24000 PSI BURST PRESSURE.
THE BRASS PLUG IN THE END OF THE CHAMBER IS THREADED 3/4 INCH – 10 THREADS PER INCH AND “O” RING SEALED.