Roughly 1 gram = 15.4 grains and 1 mph = 1.47 fps, so a car weighing 1 metric ton doing 30 mph has kinetic energy of (30 * 1.47)^2 * 1000000 * 15.4 / 450240, about 66500 FPE!
In grains (for pellets) its ((fps)*(fps)*(weight grains))/450240
But what is it in pounds?
I tried ((fps)*(fps)*(weight pounds)) but that gave a very big number!!
I’m trying to work out how many FPE a car carries at a given speed.
Thanks All
Ora
Roughly 1 gram = 15.4 grains and 1 mph = 1.47 fps, so a car weighing 1 metric ton doing 30 mph has kinetic energy of (30 * 1.47)^2 * 1000000 * 15.4 / 450240, about 66500 FPE!
Hi
Its fps x fps x pellet wieght divided by 450240 this will give ftp energy...
Old soldiers never die,They just get mothballed..
There's 7000 grains per lb, so you could use fps * fps * lb / 64 for the approx ft lbs.
Last edited by Numb Nut; 08-04-2004 at 01:34 PM.
Isn't this just Newton's Third Law?
Momentum = mass x velocity
Weight of car in pounds times its velocity in feet per second = foot pounds energy...
Paul.
Momentum equals mass times velocity!
Force equals mass times acceleration!
Yank equals mass times jerk!
Tug equals mass times snap!
Snatch equals mass times crackle!
Shake equals mass times pop!
Paul, kinetic energy and momentum aren't the same thing!
66500
That's the size I was getting and people get all legal on us if a pellet gets an extra 1 FPE.
Ora
But pellets are quite hard to steer around obstacles...
E = m * v * v /2
W = Energy (J)
m = Mass (kg)
v = Velocity (m/s)
But pellets are quite hard to steer around obstacles...
Works in Imperial just the sameOriginally posted by mikebike
E = m * v * v /2
W = Energy (J)
m = Mass (kg)
v = Velocity (m/s)
Energy = foot poundals
Mass = pounds
Velocity = fps
It only gets silly if you insist on using bizarre units like foot pounds and grains
Yup, true Robin - but you have to remember to divide the weight of the projectile by the acceleration due to gravity (approx 32 f/s^2) to give you the mass of the projectile.
just you stick to lying low on fragile roofs mate!
stop showing these boys up!
by the way we are up at the new ground on friday mate due to the hall being closed for the easter
rgds
kenny
p.s. doug says cheers!
Originally posted by Numb Nut
Yup, true Robin - but you have to remember to divide the weight of the projectile by the acceleration due to gravity (approx 32 f/s^2) to give you the mass of the projectile.
I think not
Forgot I was afraid of heights until the roof started to wobble! Doh!Originally posted by figjam
just you stick to lying low on fragile roofs mate!
Thanks for the tip - so will we be shooting or building the new sheltered firing point?by the way we are up at the new ground on friday mate due to the hall being closed for the easter