Candid

Again, I only posed the question, If you don't have a relative contribution, that is OK with me.

Are you familiar with argument fallacies? The topic Started is available references on action timing for Stoner type auto loading small arm.

LOL I only shoot one shot at a time 😉

Yes, external ballistics. Hot High and Humid. There are many who know so much more on that topic than I.

smile .....just looked, the last renewal is 2000 😉 I need to get up there more often.

No, That is really not the interest. That entire obsession is way to much tension. I don't "think" the author has much interest in gas actuated autoloaders.

Well said! With that, I put a new spring in the SKS about a year after picking it up, What a difference in cycle smoothness. That bolt carrier was slamming with the original spring. Not a costly change, and what a useful result! If only it would shoot straight 😉 MOD is best one can ask.

Yes, I think you have missed the effect of gas pressure propagation as a function of temperature

Smooth cycling, minimal disturbance, one hole, and two hours of pleasant range time....

I have played with 5 grain "cut lead" projectiles from several air rifles. Over the chrony they go nearly 1400fps. Crack! But they don't go very far, and don't strike anywhere near where they are pointed.

Density altitude applies to external ballistics in fire arms. Do you need a copy of my FAA Repairman's license or my flight log? It's been some years since I've exercised either, but BTGTTS. Hot High and Humid The topic at hand is HOT

Is there a section on internal ballistics? It appears to be a good read on external ballistics if the title is "Long range". I live in the Eastern hardwood forest. 100 meters is about as far as one can see through the woods.

No Pressure change is instantaneous. Just as no motion is instantaneous. That is the topic. The effects and the actions must work together. The reference offered shows a great diversity of pressures at the gas port associated with four common barrel configurations. They all seem to be workable. I find that interesting.

Speed of sound is 330m/sec in what medium? Gaps....

It was an abstract juxtaposition without any basis. I know nothing of you but your hundreds of contributions to this forum.

I asked a question about available literature. If you have no awareness of any, That's OK by me. The topic is of interest to me, any at least one other member, if it is not of interest to you, that's fine. Follow your own pleasures.

Copper compression Units are the standard for chamber pressure measurement. That is a difficult concept to get ones head around. 😉 Internal ballistics is exactly the topic. There have been some great pieces written on the topic. but.. tedious reading for anyone not inclined. Gas actuated mechanisms have added an additional level of complexity and intrigue. The referenced piece above suggests that the gas speed is 5X the MV at the muzzle. Must be greater yet at the gas port. But.. It meets with some resistance soon enough. A wall of hot spent gasses pressing on a fixed still air volume. Hmm Interesting effects to consider.

I know the term, I've considered the number, I'm looking for an authoritative description with the maths. Different people have different objectives. You may like to blow things up, I like to poke holes in paper very close together. I also like to know what makes why.

Please give a number, show your work. Insults if you must

Don't get me wrong, I have read many of your posts across many of the threads in this forum. You are a practical person. There may be some gaps , but you are most sincere. Is there no room for theory on this board? I am somewhat versed in high speed gas guns. Interesting things going on in those systems.

OK, simply, how much time does it take, after the projectile passes the gas port, until the bolt "sees" sufficient pressure to start moving the BC rearward and the bolt face forward? I'll wait.

One must consider that a change of PRESSURE must follow some physical SPEED LIMIT. It doesn't just happen all at once. How much time does it take for a brass casing to relax from a 50ksi stress? How much time for a steel case? These details matter. They can be resolved through BF&I (brute force and ignorance) Understanding is it's own reward.

A study of high speed gas guns will reveal some incredible propagation velocities obtained in the high temperature wave front. That bringing in the question of the interaction of the still and cool air that is in the gas tube and bolt action volume.

This is good enough http://ar15barrels.com/prod/operation.shtml

Are there authoritative references on the gas and bolt timing for the AR -10/ Ar-15 type actions? Is it all trial by error? I would like to better understand the timing as the expansive gas opens the bolt. Rifle length, mid length. carbine length pistol length, they all are able to work, How? Gas travels at the sonic limit , and is a function of temperature. These "details" are of interest.