The Spanish tried to blow up a rolling block as part of selection trials ..........with barrel plugged ,and 270 gr of powder ,the gun could not be blown up.....This trial is widely documented.
The Spanish tried to blow up a rolling block as part of selection trials ..........with barrel plugged ,and 270 gr of powder ,the gun could not be blown up.....This trial is widely documented.
"nothing is impossible to the willing student"
I blew the nipple out of one of my post hole guns - shredded the metal on its way out - used a half charge so 6 inches of powder then rammed in six inches of dirt over it - then spent about 15 minutes swinging the sledge hammer to drive that gun down into an old farm road bed - the mistake was the half charge - it was bottled up so tight that there was no place to go - the shredded nipple went what I believe was several hundred feet vertical, landed back with a clunk on the shed roof near me, tinkle tinkle plop right on the ground at my feet.
That roller that held either didnt have a big enough charge or wasnt plugged good enough else it would have blown.
Today I watched a video on YouTube of a guy who made a .22 cal muzzleloader, with just an 18" barrel. It says in the video that he reached up to 3,200 fps with the lightest bullets.
One thing everyone has failed to consider, is the maximum pressure that black powder is capable of achieving, which is 36,000 PSI. When the pressure reaches maximum, it stops burning until the pressure drops below max, and it is then reignited,by the heat. This cycle repeats itself until the projectile exits the muzzle, and the pressure drops to near zero, and the remaining unburnt powder ignites causing the ball of fire and sparks at the muzzle.
With this knowledge in hand, it is easy to understand why it is possible for longer barrels and lighter projectiles to gain higher velocities. It also leads one to conclude that in most of our guns, we are reaching the point of diminishing returns quicker than we realize, and are most likely burning more powder than we need. I absolutely noticed this with my Colt Walker. I don't remember the exact numbers now but the difference in velocity with a 210 gr conical with 40 grs of 3F was like 10 fps less than with 50 grs. I will gladly save 10 grs of powder per shot and give up 10-12 fps.
WWG1WGA
Tyrants use the force of the people to chain and subjugate-that is, enyoke the people. They then plough with them as men do with oxen yoked. Thus the spirit of liberty and innovation is reduced by bayonets, and principles are struck dumb by cannon shot: Albert Pike, Morals and Dogma
Friend, this information of yours is very important, it makes all the difference in understanding. Maximum 36,000psi and stops burning when it exceeds this value. Could you provide the source of this knowledge? I searched and found nothing! There is a black powder calculator, P-Max, which makes calculations showing pressures above that.
I watched a program about Bull, the Big Gun designer
I always wondered how he believed he could put an object into orbit using black powder... but this explains it a bit.
a LOONNNGGGG barrel, and progressive burning BP charge.... 36kpsi over a long time could generate some serious velocity
could this be why some muzzleloaders had long barrels? to allow the use of heavier charges for greater velocity?
some interesting thoughts come to mind.
I am ONLY responsible for what I Say!
I am NOT responsible for what You THINK I Said!
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If numbers killed I'd hunt with a Calculator!
I believe history is full of examples of improvised explosive devices made using metal containers full of black powder.
If 36kpsi is the max BP can generate, then the container would have to be unable to hold that pressure to work as designed.
I also believe barrels that blow up due to obstructions have a different principle involved, something about the moving projectile's momentum compressing the air ahead of it. This is very different than the pressure to accelerate the projectile in the first place.
I am ONLY responsible for what I Say!
I am NOT responsible for what You THINK I Said!
====
If numbers killed I'd hunt with a Calculator!
years ago a club member had a 66 pound bench gun that shot a .54 caliber round ball over 250 grains of powder to 2500 f/s
I have a 40 caliber 43 inch barrel on my flintlock that with a patched round ball and 70 grains of powder will deliver 2275 f/s .
That long barrel gets the same speed from both FFFG & FFG powder .
When I think back on all the **** I learned in high school it's a wonder I can think at all ! And then my lack of education hasn't hurt me none I can read the writing on the wall.
[QUOTE=Boerrancher;5720234]One thing everyone has failed to consider, is the maximum pressure that black powder is capable of achieving, which is 36,000 PSI. When the pressure reaches maximum, it stops burning until the pressure drops below max, and it is then reignited,by the heat. This cycle repeats itself until the projectile exits the muzzle, and the pressure drops to near zero, and the remaining unburnt powder ignites causing the ball of fire and sparks at the muzzle.
Do you have a reference for this?? I have blown a post hole gun with black powder and from the look of the shredded metal though way more than 36K involved???
[QUOTE=indian joe;5726150]Actually I was being generous with 36,000 psi. Here are the results of the US Army’s testing of Black Powder. Please note that it is in metric measurements so you will have to do the conversions yourself back from atmospheres and Kg per cm2. This document proves unequivocally that if you blow up a black powder firearm it is because you did something stupid like left an air pocket, had a plugged bore, etc, or there was a flaw in the steal itself, because the Holy Black just doesn’t generate that much pressure.
https://apps.dtic.mil/sti/pdfs/ADA150455.pdf
WWG1WGA
Tyrants use the force of the people to chain and subjugate-that is, enyoke the people. They then plough with them as men do with oxen yoked. Thus the spirit of liberty and innovation is reduced by bayonets, and principles are struck dumb by cannon shot: Albert Pike, Morals and Dogma
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |