Theoretically a pellet fired straight up will shed velocity until it stops (perihelion) then it will accelerate downward under the influence of gravity until it reaches terminal velocity(when gravitational attraction and drag reach a balance point). Experiment: Drop pellets off a tall building through a chronograph. A totally impractical but illustrative idea.
Quote from: BackStop on February 07, 2020, 09:05:45 PMQuote from: DevilsLuck on February 07, 2020, 09:03:35 PMQuote from: Duckfish on February 07, 2020, 08:56:26 PMQuote from: DevilsLuck on February 07, 2020, 08:49:45 PMQuote from: Duckfish on February 07, 2020, 08:45:06 PMJezze, read Newtons laws of gravity. Everything falls from the sky at the same speed. Bird poop, pellets, or bricks. How much damage it does has to do with its weight.Paratroopers would disagree with your assertion...But not helicopter pilotsDrag... Ain't it a drag..?Auto rotate down as far as you can and just pull the collective at the right moment... (grin)Never trust a vehicle who's wings move faster than the fuselage...
Quote from: DevilsLuck on February 07, 2020, 09:03:35 PMQuote from: Duckfish on February 07, 2020, 08:56:26 PMQuote from: DevilsLuck on February 07, 2020, 08:49:45 PMQuote from: Duckfish on February 07, 2020, 08:45:06 PMJezze, read Newtons laws of gravity. Everything falls from the sky at the same speed. Bird poop, pellets, or bricks. How much damage it does has to do with its weight.Paratroopers would disagree with your assertion...But not helicopter pilotsDrag... Ain't it a drag..?Auto rotate down as far as you can and just pull the collective at the right moment... (grin)
Quote from: Duckfish on February 07, 2020, 08:56:26 PMQuote from: DevilsLuck on February 07, 2020, 08:49:45 PMQuote from: Duckfish on February 07, 2020, 08:45:06 PMJezze, read Newtons laws of gravity. Everything falls from the sky at the same speed. Bird poop, pellets, or bricks. How much damage it does has to do with its weight.Paratroopers would disagree with your assertion...But not helicopter pilotsDrag... Ain't it a drag..?
Quote from: DevilsLuck on February 07, 2020, 08:49:45 PMQuote from: Duckfish on February 07, 2020, 08:45:06 PMJezze, read Newtons laws of gravity. Everything falls from the sky at the same speed. Bird poop, pellets, or bricks. How much damage it does has to do with its weight.Paratroopers would disagree with your assertion...But not helicopter pilots
Quote from: Duckfish on February 07, 2020, 08:45:06 PMJezze, read Newtons laws of gravity. Everything falls from the sky at the same speed. Bird poop, pellets, or bricks. How much damage it does has to do with its weight.Paratroopers would disagree with your assertion...
Jezze, read Newtons laws of gravity. Everything falls from the sky at the same speed. Bird poop, pellets, or bricks. How much damage it does has to do with its weight.
When terminal velocity is reached, aerodynamic drag is equal to pellet weight.Assuming a standard sea level air density and Cd = .32, V = 150 f/s.
Quote from: Blowpipe Sam on February 07, 2020, 09:41:35 PMTheoretically a pellet fired straight up will shed velocity until it stops (perihelion) then it will accelerate downward under the influence of gravity until it reaches terminal velocity(when gravitational attraction and drag reach a balance point). Experiment: Drop pellets off a tall building through a chronograph. A totally impractical but illustrative idea. A perfect idea. But once achieved... What can we expect ballistics wise?
ChairGun to the rescue!.... Using the pellet specified (BC = 0.029), at any velocity over about 500 fps, the pellet will stop and then achieve terminal velocity before it hits the ground.... It's a bit hard to get a precise value from the graph, but my best guess is about 108 fps, which is less than 0.4 FPE.... I seriously doubt it would even break the skin.... Interestingly, at any angle over about 40 deg., with a muzzle velocity of 800 fps, the velocity on impact is the same.... only the range to impact changes.... Bob
but my best guess is about 108 fps, which is less than 0.4 FPE.... I seriously doubt it would even break the skin....
This is all extremely educational, but ...... WHY are we shooting pellets straight up into the air?