barnbwt
member
- Joined
- Aug 14, 2011
- Messages
- 7,340
"It's so hard to not be snarky"
Then take a break (for a couple hours)
Guys, do please try to avoid getting the thread locked before I have a chance to put up some free-body diagrams in an hour or so...I'll be seriously bummed if this interesting (if needlessly heated) conversation gets shut down.
The real problem I'm seeing is that a math problem --which is what friction/momentum/etc. are-- is incredibly hard to articulate in words (see "trains leaving Baltimore at 3mph and 50mph..."). Which is why I think free-body diagrams will be helpful in at least clarifying the various viewpoints (which I now think are all 'proving' exactly the same things, but we're arguing over which of two separate conclusions --both accurate-- are correct)
My FBE's;
-Slide locked w/ barrel, during period bullet in in the bore; solving for an equation that determines slide/barrel group initial speed (assuming bullet reaches muzzle velocity instantly, which is good enough for bulk slide momentum calcs)
-Barrel camming down (not a 1911 expert, so this will probably have a bad assumption somewhere, but it kinda matters not if the action is depressurized at this point). The goal is to find momentum of barrel/slide as they decouple
-Cartridge extraction once barrel is arrested (examining how extraction forces may affect slide dynamics)
TCB
Then take a break (for a couple hours)
Guys, do please try to avoid getting the thread locked before I have a chance to put up some free-body diagrams in an hour or so...I'll be seriously bummed if this interesting (if needlessly heated) conversation gets shut down.
The real problem I'm seeing is that a math problem --which is what friction/momentum/etc. are-- is incredibly hard to articulate in words (see "trains leaving Baltimore at 3mph and 50mph..."). Which is why I think free-body diagrams will be helpful in at least clarifying the various viewpoints (which I now think are all 'proving' exactly the same things, but we're arguing over which of two separate conclusions --both accurate-- are correct)
My FBE's;
-Slide locked w/ barrel, during period bullet in in the bore; solving for an equation that determines slide/barrel group initial speed (assuming bullet reaches muzzle velocity instantly, which is good enough for bulk slide momentum calcs)
-Barrel camming down (not a 1911 expert, so this will probably have a bad assumption somewhere, but it kinda matters not if the action is depressurized at this point). The goal is to find momentum of barrel/slide as they decouple
-Cartridge extraction once barrel is arrested (examining how extraction forces may affect slide dynamics)
TCB