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Concorde Vs Bullet
The 50 caliber Browning machine gun bullet has a muzzle
velocity of about 2700-3000 fps, about Mach 2.5 but it is slow by jet standards and has been replaced for aircraft use by the 20 mm with higher velocity. The 45 ACP pistol has a velocity of about 800 fps and is sub-sonic, the .22 LR HV is just above Mach 1 but slows to below Mach 1 by 25-50 yards. The 30/06 and other modern rifles have velocities from 2700-4000 fps depending on caliber and bullet weight. The drag coefficient of a bullet of the heavy bullets used in the 50 BMG and the 20 mm is such that the bullet does not slow below Mach 1 for about 1/2 to 1 mile. The bullet at a hyper speed exiting the muzzle would slow faster than the same bullet fired from a stationary platform because the drag increases by the square of the airspeed. -- The people think the Constitution protects their rights; But government sees it as an obstacle to be overcome. some support http://www.usdoj.gov/olc/secondamendment2.htm See http://www.fija.org/ more about your rights and duties. "Jose" wrote in message . .. | If concorde (or and other supersonic | aircraft for that matter) was fitted with guns then the bullets would | not be able to leave the muzzle | | I don't think there's anything special about being supersonic to the | basic physics involved (though it will add some wrinkles). Before | firing, there will be ram air pressure in the (forward facing) muzzle. | When the bullet is fired, there will be explosive chemical pressure | behind the bullet which will exceed the ram air pressure in the muzzle - | this difference will cause the bullet to accelerate down the muzzle. At | some point the pressure behind the bullet will begin to decrease (as the | reaction ends and the volume continues to increase), while the ram air | pressure will increase further up the muzzle (due to the bullet pushing | the air away). Given a sufficient charge, the bullet will exit the | muzzle and become a projectile. The speed of exit depends on the size | of the charge - obviously a dud would not eject the bullet (but this is | true of anything). | | Once the bullet exits the muzzle, it will slow down and descend at a | rate typical of a bullet. The plane flying behind or next to it is | independent and largely irrelevant, though it will maintain speed and | altitude due to its engines. | | Bullets typically are supersonic to begin with, so there's nothing | special here. Coming out of the concorde it will have an initially | higher airspeed than a typical bullet shot from the ground, so it will | decelerate more quickly. My gut feeling (I have never shot a gun | however) is that the bullet will have enough excess forward speed that | by the time it slows down to the concorde's speed, it will be way ahead | of the plane. | | Do fighter planes have guns that fire at supersonic speeds? I suspect so. | | Jose | -- | Money: what you need when you run out of brains. | for Email, make the obvious change in the address. |
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