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Old September 21st, 2012, 14:08   #16
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Join Date: Jun 2005
Location: Consecon, Ontario
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Originally Posted by ccyg8774 View Post
Are you going to colour the BB in some way to monitor the spin of the BB in the barrel? Or just study the "touching" between BB and the barrel?
Spin is out of scope for this first round of tests. We do have our hands on some BB's that are two colored and "swirled" that could be used to track rotation.

Originally Posted by m102404 View Post
Obviously you're aiming to catch the bounces in flight vs. examining evidence of a bounce post shot.
Yes. Anything past the muzzle is out of scope.

Originally Posted by m102404 View Post
In a good setup my bet is 2 bounces...first right after the hopup nub...the second close afterwards and then I'm guessing it's stabilized and/or doesn't get a third bounce before it's gone from the barrel.
You bet is laid. I will be keep track in a separate spreadsheet.

My own bet is it strike after hop is applied and then no contact for the rest of the journey

Originally Posted by m102404 View Post
You could cheat and coat the inner surface of the barrel with a thin flim (say Molybendum)...then shoot a bunch of shots and look for discolouration patterns (it'll turn more silver as it's impacted). You could also capture BB's after the shot and if they had black marks on them then they've hit the barrel somewhere.

You don't even need a clear barrel to see that...just don't get any on your hopup rubber. I'd see coating the entire barrel...then cleaning the first inch of it (or just past the hopup cutout)...then assemble, clamp you gun in a vise and shoot. You can get powdered Moly at shooting places.
While not our primary approach, this is something we considered and will be doing (thanks for the tip on the moly). And while you don't need a clear barrel for the test it would make thing much easier, as the pattering could be observed in real time by simply looking at the barrel. Not to mention not having to capture BB's without disturbing any residue they may have picked up on the flight

Originally Posted by m102404 View Post
I'd stay simple and just setup for one set of standard barrel length (say 363mm) with 0.20's @ 350fps. Detail and publish the test setup and results and put it out there for peer review. Filter through the reviews and adjust testing from there.

Best of luck with this.
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