Quote from: Xraycer on February 12, 2020, 08:35:32 PMMotorauderLol. +1 the man, the legend. Finally a correctly built Marauder.
Motorauder
This was a fun project that has been in the works for well over 2+ years now.After recently having a gracious GTA member do the final machining on the main air tube, all the parts and pieces stashed away could get assembled. Into the mix some modern Tech as well making for a rifle that LOOKS LIKE an M-rod but ONLY used 3 OEM parts Those being a partial & re-machined steel Air tube, Trigger group and Stock. EVERY OTHER PART is something custom or one off exotic / prototype.Inside this beast sits one of my custom balance valves ( actually this one ) with the reversed thimble & external spring. Transfer port is a TAPERED design reducing the output end for increased throat back pressure and faster poppet closing. * tested & proven effective in a previous thread.Hammer is a buffer type of my own design having an adjustable peek striker thrown at the valve via an External SSG devise where screw protrudes out the back of adjuster when cocked.Air tube at a length providing @ 80 cc of plenum then a WAR drop block. 500cc 3K aluminum tank with a prototype adjustable output regulator provides the required HPA.Up on the upper receiver sits a JSAR side lever breech with a full length @ 23.7" LW Poly barrel in .25 caliber. Custom shroud, end cap screwing on placing the assembly into tension being Super stiff and no wiggle !Stock was cut out as needed for the regulator and kept long on the right side, shortened on the left for gauge & adjustment access. All done painted in Rustoleum textured along with shroud tube.There the build in condensed format ... performance data to follow Scott S
Just can't leave it alone striving to settle for a caliber and power setting that will shoot a wide variety of ammo well Ended up settling for .22 caliber & using the HW 6 groove w/o choke being 24" long. This barrel just shoots so well over such broad speeds with both pellet / slugs it was the obvious best of the best choice.Here is the breakdown on differing projectiles speed and power ( 2150 psi set pressure )Pellet JSB Monster Heavy 25.4 gr redesign @ 920 fps @ 47.7 fpePellet H&N Barracuda 21.3 gr @ 1015 fps @ 48.7 fpePellet JSB Heavy 18.1 gr @ 1070 fps @ 46.1 fpePellet JSB Exact 15.9 gr @ 1120 fps @ 44.28 fpePellet Crosman 14.3 gr @ 1147 fps @ 41.77 fpeSlug NSA 24.8 gr @ 920 fps @ 46.6 fpeSlug NSA 23 gr @ 948 fps @ 45.89 fpeSlug NSA 20.3 gr @ 1008 fps @ 45.79 fpeWhat i find interesting is that the power is so flat not really being dramatic with weight shifts as we see with conventional valved PCP's No doubt with light stuff we see a dip, but in the upper weights there all within @ 3 fpe ... WOW be it a pellet or draggy in bore slug the power is there !!As set now the muzzle report is very low being a dull thud and efficiency is appearing to be really really good. Are we done yet ? .... Think we should be, REALLY I DO !!!Scott SOups, spell correction
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