Thử nghiệm Super BCAR Experimentation

Apparently the Akasha BCAR works really good. Whether it's the enormous porting, the inline PCAR, progressive crush, or all of the above, I've no idea. May as well mess around and see, so I drew up a few mock ups to test.

TLDR picks: SBCAR7 is closest in spirit to akasha, CR then Clc are my personal picks.

Feedback is welcome so I can try to figure out what makes this system tick.

Design Choices:

made the change in crush more linear and picked values that felt reasonable, used 7 stages since my base design already had it, made helical and reverse staggered geometries, made a couple levels of crush for the pcar by vibes and what myliege23 on Discord measured, 8 or 7 degrees by what the official sketch seemed to show, 5 degree for personal preference. Also some with progressively increasing crush after seeing promotional product pictures possibly contradicting TW Tommy's confusing quote "3 stage reducing squish bearings" that I took to mean reducing crush.

I've got limited space to test so throwing it out there. From a cursory test of the CR variant, I got what looked to be a horizontal spread under 1" from over 35' using stock Harrier iron sights, a 250fps harrier, and some beat up heavies from my personal and club's pool.

Progress/Updates:

V0.1: I messed up the crush increments by inputting diameter in place of radius (so 11.7 incremented by 0.2 actually went up to 14.1 and the increasing crush went to 10.5), so I will be exporting them again with halved crush increments. This and a labeling mistake means the crush increment debossing should actually be read as the negative change in crush in terms of radius (double the number and subtract it from crush per stage to get that stage's crush).

A few members of BCFF took a few copies to test and had disastrous results on a CynthiAWP, fine on an Ontos at ~250 fps. At my games, I found it shot remarkably straight on a Harrier.

BOM and Build Notes:

BOM: F683ZZs and m3x10 flat head screws like my past designs or any m3 screw that bolts the bearing on. Make sure the flanges face away from the screw head. Don't crank the screw in. Turn until you feel the resistance jump and stop so you don't mash the standoff flat or jam the outer race of the bearing into the print.

Testing Other Parameters:

Feel free to grab the source F3D from what I remixed and try your own parameters for the BCAR section (May require some wrestling with the CAD file). Messy F3D of one version included as a zip for people who know what they're doing (it breaks on a lot of inputs and will need reworking).

If you just want to test a bunch of angle/crush combinations on a long BCAR, check out the 6 row versions of the Lynx Keyed BCAR or let me know of another angle you need (they use a similar friction fit and fit on standard barrels just fine) or try the original Celestial BCAR.