
Originally Posted by
MistWolf
"See, Capt'n, that's why, although you fly it, it's my airplane. You ride her hard, use her, abuse her and at the end of the day, it's this lowly airman that sweats and bleeds over her until she's put back to rights. I understand her. And trying to translate what you told me is wrong into what's really wrong adds time to the troubleshooting. You'll tell me the hydraulics don't lock the landing gear (when I know the hydraulics weren't designed to lock the landing gear that they lock mechanically) when the real trouble is the the landing gear light didn't go out because the position switch is bad"
They are locking lugs not tabs. Not everyone knows that all the cam does is rotate the bolt or somebody wouldn't have made the claim that the cam along with the locking lugs locks the bolt.
The dwell time is measured from the time the bullet clears the gas port until it exits the muzzle. Once the bullet clears the muzzle the gas pressure drops. Self loading small arms are designed that the bolt does not extract the spent casing until the pressures in the barrel have dropped to safe levels.
Carbine length gas systems have their ports closer to the chamber where pressures are much higher than they are further down the bore. In a 14.5" barrel, the distance from port to muzzle is shorter than it is with a 16" barrel. The BCG is exposed to these raised pressures for a longer time. Again, that's because the bolt must stay locked until pressures in the barrel drop to safe levels. If you used a carbine length gas system with an 18" or 20", dwell times are even longer.
Sure, Go Middy, YAY! But all you have to know capt'n is how much more violent the middy is compared to the rifle length system because you can see it doesn't really matter. Except to those who have made an effort to understand how it all works so they can be kept running
Wow crew chief. I am not quite sure how to interpret this. Thank you for the corrections. Always appreciated, honestly.
Flying is just another hobby for me. My profession is keeping extremely complicated machines operating. I am a field service engineer. I still bust ass in the field covered in nasty crap. I understand multiple system cooperation quite well. Responding to this post was as much to reinforce my knowledge base as to respond to the OP's question. You don't know what you don't know until you explain it, step by step in detail. What knowledge I lacked, I made no attempt to disguise. I was quite open in what I don't know.
I appreciate the effort that goes into knowing everything that is required about everything in a system to keep it running. Its what I do too. I was in no way trying to derail the knowledge train. I was just chiming in with what I know.
I fail to see how the cam does not have a part in locking the bolt when the rotation of the bolt allows the lugs to engage. Please excuse my poor parts I'd. Using incorrect terminology does not invalidate the information stated.
Thanks for the clarification on dwell definition. Now that we know dwell times biggest factor is the amount of barrel after the gas port I have a question. Will the bolt open in either system with any popular barrel length, before the bullet leaves the barrel? You stated that the bolt will not open until pressures drop to a safe level. How is this compensated for in production rifles of differing gas tube lengths? With the increased cycle rate of the carbine I would guess that maybe they are not.
Btw, the monologue was great, just pointed at the wrong guy
"Oh, its a wonderful day! My sun is shining, my birds are chirping, my humongous chicken defeated Elmo." Huxley
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