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Should have said LP spring

125 bar, PW 11, def tighter groups than BM 177 JSB Ex M 13.43 , JSB Ex Monster Redesign Shot count: 10 Low: 802 FPS Hi: 814 FPS Avg: 809 FPS Spread: 12 FPS STD Dev: 4.1 FPS 16-Dec-2023 13:40:58,814,FPS,19.8,FT Lbs, 16-Dec-2023 13:41:36,805,FPS,19.3,FT Lbs, 16-Dec-2023...

@Solo1....damn its that obvious? haha yes ChE been working in the industrial gas business for ..too long, well acquainted with pneumatics, regulators etc...so trying to determine the performance characteristics of the pressure regulator-hammer valve-valve system of my rifle... 1000, no not yet...

From Huma page: Not sure why BRK hasn't published something like this, they have to have it, as they had to determine hammer weight, hammer spring stiffness (for 5 now 6 diff springs)....

Cole, as you know I am noob here having only shot my air rifles in my back yard...How many shots are in a FT round? How many rounds make a match? Can you make a PW adj during a round? Can you take shots between rounds to make adjustments? What distance should I zero my scope? Is there an...

Agree, except I change the PW from 9 to 8 half way in....in hindsight I should have left it at 9 to better show the change in P and V over the 4 consecutive magazines.

Not disagreeing with you, but unless the o-rings and spring washers weren't properly lubricated, adjusting the regulator should not damage it. Two characteristics [The Basics of Pressure Regulators] of a regulator are creep and *droop. Both can increase with increasing spring compression (for...

I think this trend clearly shows the (my) Ghost's muzzle velocity increasing as you progress through a shot string, and its due to the plenum pressure steadily falling with each shot..so much so that after two magazines, I changed the PW from 9 to 8 to try and keep the pellets ~900 ft/s. Is this...

Hello Lee, 1. I have the HP2, HP1, HP, MP and LP springs. How do they relate to the color scheme? 2. What Regulator pressure was used to correlate the ft-lb to each spring? Regards tc

The 130 bar *plenum has ~130/80 more air in it than the 80 bar plenum. Also 130 bar has more pressure energy, so it takes less air to get the pellet to your desired velocity, that air also flows into the barrel faster, and the valve has to open/travel less so from the time the trigger breaks to...

Thought I replied to this...besides wanting to be able to shoot Heavy, Monster and Beast without having to change the hammer spring. The higher the regulator pressure-plenum pressure, the gas/air has more energy stored in it, the plenum has more mass of air store in it. More energy means less...

Just squeezed in some testing before the monsoon....177HP Flitz polished barrel, LP Spring (no spacer) H&N BM 10.65 gr unsorted, Whiscombe oil lubed, tightened up into 1 ragged hole for 5 shot groups at 36 yards at ~900 ft/s. That was at ~92 bar PW7 and ~115 bar PW8 Next plan is to see what...

So.......if I got a 177 pin probe for the 177 20.5 gr Neilson slugs......I wonder how much more velocity that would be...is there such a thing? B&K don't offer one...

haha no clue, I guess its time to go figure that out...

177 flow through like probe you are holding, .22 pin like the probe to the left. The "oval" hole on the probe looks modded, yes? The photos I posted, I measured the 2 axises of the oval transfer port on the probe and outlet round port at the end of the probe. I updated that post to be more clear

Yes correct,the .22 Revere is 30+ ft-lb, the Ghost..I can easily adjust that to be sub 20. I have no need for more ft-lb right now. Seals: I have inquired at BRK (multiple times multiple ways )and AoA on the design limits and expected operating parameters given the 5 different hammer springs...

177 = 4.495 mm so 15.87mm2 8.36/15.87=52.6% Stem 7.69/15.87= 48.5%

177 HP flow through probe with oval transfer port. measurement in mm "A"= 3.36; "B"=3.17 mm Area = (3.36/2) x (3.17/2) x pi =8.36mm2. Stem opening is 3.13mm Area = pi*r^2=7.69mm2 "A" axis measurement of oval "B" axis measurement of oval End of probe opening measurement

Fluid flow. When trying to flow a gas through a valve (restriction) when the upstream press is ~2x the downstream, the flow goes sonic in velocity and “chokes”, decreasing the down stream press will not change the flow rate. So by having a reg press of 200 bar, I was trying (poorly) to explain...

Choked flow occurs when downstream pressure is (0.528) x (Upstream pressure).....so optimal Regulator Set Pressure for fastest recharge rate would be (0.528) x (Min Bottle Pressure before Refill). So for me, at 200 Bar Refill pressure, 105.6 bar would be optimal Reg pressure for fastest fill...