Performance Firearms and Thermodynamics. Parts I & II - Page 3
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  1. #21
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    An aluminum-shrouded barrel with full length linear cooling fins would add rigidity as well...yes? sure would get a lot of attention at the range.

    T. S.
    msharley, granpa52 and gunscrewguy like this.
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  2. #22
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    Hey Adam,

    Think Mr. Thompson had a few ideas on cooling.........

    Later, Mark
    Texas Shooter and granpa52 like this.
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  3. #23
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    Hey Adam,

    Know that water cooling is a "non starter" for today's enthusiast.....

    Mr. Browning had a few ideas .............. (have you ever read the "stats" on a water cooled Browning?)

    Later, Mark
    Duty is the sublimest word in the English language. Every man should desire to do his duty, no man should desire to do less. Robert E Lee.

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  5. #24
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    Mark,

    The Tommy and the Browning are both great examples of cooling in early firearms. I mentioned them in Part I, because it's curious to me that these early attempts were abandoned. Notice the fins on the Tommy are lateral instead of longitudinal. Mr. Thompson clearly understood how air moves around a hot barrel. The Browning is wicked cool. Water cooling might still make sense for vehicle mounted or crew-served weapons today, but for us civilian shooters it's not too practical. It certainly says something about it intent though, doesn't it. Show up for a hog hunt with something like that. Yikes.
    Ranger Point Precision (Houston, TX) - Lever Action expert, Precision Gunsmith and Machine Shop. We custom-build lever action, AR15 and long range rifles and we design and manufacture Marlin, Henry and Steyr A1 Pistol parts (medium loop levers, day & night sights, scope mounts, dovetail fillers, full-length 444 mag tubes, and more). Some of our best sellers are our Marlin 1894 Pistol Caliber, Short Strokes (9mm, 10mm, 327 Fed/32 H&R, .40 S&W, .44 RIPSAW, .45ACP, .45 Cowboy, .357 SIG and more); Marlin 410 Lever Action Shotgun; Marlin 336 36 RPP (big brother to the 35 Rem); Marlin 336 Ackley Improved and Ackley eXtreme for .308ME handloads (or 7-30 Waters, 38-55, 25-35); Hand-Built 6.5mm Grendel AR-15 Rifle; performance gunsmith services of all kinds from match grade barrel swaps to trigger & action jobs, accurizing, barrel shortening/threading/porting and muzzle brakes along with KG Gun Kote and Duracoat metal coatings and wood refinish work.

  6. #25
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    Hey Adam,

    I know you mentioned them.......just thought pics would be "cool" (pun intended!) !!

    I seem to recall (not sure?) reading that in the "trials" of the .30 caliber Browning..........it went 20,000 rds! (they ran out of ammo, before the barrel needed changing or the gun "failed") Typical of Mr. Browning designs............

    Oh yes! Hog hunting with a water cooled Browning......... maybe mounted on a suitable "period" vehicle........ put me in! (send you $200......right now......to pay the "Stamp") Don't care if I need to "hitch hike" to Texas!

    On another note......give any thought to a "Plasma Rifle"? Maybe use a "mag rail" to launch the plasma "packet"?

    Nah. That is still in the future....LOL

    Col. Whelen was on to something in the early part of the 20th Century. They "lubed" the '06 ammo, for the Army Rifle Team. Seemed to reduce the need for cleaning.........

    Using the '06 as a "base line" (performance vs recoil) we are at the "end". The friction of the projectile in the bore is "required" for the propellant to achieve "optimal" performance! (note, if one uses a cast bullet in a .30 caliber rifle, one needs to use a "faster" powder....to obtain a "reduced" velocity. One can not use the "normal" powder/charge). The cast bullet is "slicker" than is the "normal" jacketed bullet, and will not allow pressure to "build".

    So, if we come up with a "slicker" projectile/rifle barrel, we will need to come up with a "cooler" propellant? Paying mind to the fact that it takes 50,000cup to launch a projectile at 2,700 fps. Always a "catch".........

    Later, Mark
    Duty is the sublimest word in the English language. Every man should desire to do his duty, no man should desire to do less. Robert E Lee.

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  7. #26
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    Quote Originally Posted by Texas Shooter View Post
    An aluminum-shrouded barrel with full length linear cooling fins would add rigidity as well...yes? sure would get a lot of attention at the range.

    T. S.
    That's the idea. Rigidity and cooling both, for very little weight gain. The trick is getting those two metals to play well together. I'm not a fan of steel lined aluminum rimfire barrels. In my limited experience fitting the two metals tightly together for their entire length appears counterproductive, accuracy wise. We've begun playing around with aluminum shrouded steel barrels that have thermally conductive buffers in the space between. It shows promise, but we've got plenty of testing and tweaking to do before we call it good. We'll keep y'all posted though.
    Ranger Point Precision (Houston, TX) - Lever Action expert, Precision Gunsmith and Machine Shop. We custom-build lever action, AR15 and long range rifles and we design and manufacture Marlin, Henry and Steyr A1 Pistol parts (medium loop levers, day & night sights, scope mounts, dovetail fillers, full-length 444 mag tubes, and more). Some of our best sellers are our Marlin 1894 Pistol Caliber, Short Strokes (9mm, 10mm, 327 Fed/32 H&R, .40 S&W, .44 RIPSAW, .45ACP, .45 Cowboy, .357 SIG and more); Marlin 410 Lever Action Shotgun; Marlin 336 36 RPP (big brother to the 35 Rem); Marlin 336 Ackley Improved and Ackley eXtreme for .308ME handloads (or 7-30 Waters, 38-55, 25-35); Hand-Built 6.5mm Grendel AR-15 Rifle; performance gunsmith services of all kinds from match grade barrel swaps to trigger & action jobs, accurizing, barrel shortening/threading/porting and muzzle brakes along with KG Gun Kote and Duracoat metal coatings and wood refinish work.

  8. #27
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    Quote Originally Posted by msharley View Post
    Hey Adam,

    Think Mr. Thompson had a few ideas on cooling.........

    Later, Mark
    It would be fun to have one of those.

    Show up at the range in a pinstripe, double breasted suit, black white wingtips and appropriate hat..................................

    T.S.
    NRA Endowment Member, Texas State Rifle Association Life Member, Firearms Accumulator, Native Texan
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  9. #28
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    Quote Originally Posted by Texas Shooter View Post
    It would be fun to have one of those.

    Show up at the range in a pinstripe, double breasted suit, black white wingtips and appropriate hat..................................

    T.S.
    Hey Tex,

    Would love to!

    Later, Mark
    Duty is the sublimest word in the English language. Every man should desire to do his duty, no man should desire to do less. Robert E Lee.

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    Active rescuer of Marlin Rifles, S&W revolvers, 1911's, Mil/Surplus rifles, shotguns.............

  10. #29
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    Isn't heat dissipation part of the reason machine guns often fire from the "open bolt" position so that air can pass through the barrel when not firing?
    Wild Turkey

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  11. #30
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    Quote Originally Posted by Wild Turkey View Post
    Isn't heat dissipation part of the reason machine guns often fire from the "open bolt" position so that air can pass through the barrel when not firing?
    Hey WT,

    The main reason for the "open bolt" (such as the BAR) is to avoid "cook off". In rifle caliber (LMG's) and even more so in the 50BMG (HMG's) there is so much heat generated in the chamber end of the barrel, that rounds will "cook off". (that is, the firearm will discharge with no "input" from the gunner)

    Much like a diesel engine..........going "run away". LOL

    Later, Mark
    Duty is the sublimest word in the English language. Every man should desire to do his duty, no man should desire to do less. Robert E Lee.

    Marlinitis Symptoms: More Daily!

    Active rescuer of Marlin Rifles, S&W revolvers, 1911's, Mil/Surplus rifles, shotguns.............


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