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There is some way to measure the force of bullet lunching by windcheater? I want to use a some kind of this force meters to it But question is where I should strapped this force meters? Is it real to measure it by this device?
There is some way to measure the force of bullet lunching by windcheater?
Quote from: ClarThere is some way to measure the force of bullet lunching by windcheater?I don't understand this question at all. E.g. what is a windcheater?
I don't understand this question at all. E.g. what is a windcheater?
Clifford almost got the answer. Assuming we mean "launched from a Winchester" and not eaten by a raincoat, the trick is to suspend the rifle with the barrel horizontal, from two wires of equal length (the longer the better at least 2 or 3 meters) and add a substantial mass, say 20 kg of lead. A long photographic exposure, or a tape measure, will show you how high the rifle rises as the recoil turns into a swinging motion. Then if the total mass of the rifle plus ballast = M and the maximum height of the swing is h, the recoil energy was Mgh = 0.5 MV2 where V was the initial speed of the recoil. Now if the mass of the bullet is m and its muzzle velocity was v we know that MV = mv.and since the bullet accelerated from rest, v2 = 2as where s is the length of the barrel and a is the average acceleration so a = (Mgh/m)2/2sthus F = m x (Mgh/m)2/2s = (Mgh)2/2mswith no sophisticated instrumentation required.If you aren't happy about measuring the upswing of the ballasted rifle, you can get a rough estimate of F by ignoring air resistance and finding where the bullet hits the ground from a horizontal shot. I'll leave the arithmetic to you!
time its return to earth
Or, you can just do what the OP asked and Clifford hinted.Put the back end of the gun against a block fitted with strain gauges and measure the gauge output.You will need a fairly fast data logger.The net force on the bullet is going to be pretty much the same as the kick.
Good point about the exhaust gas momentum. In my calculation m should be the combined mass of the projectile and projectile charge, since nearly all the gas leaves the barrel.
You would need an extremely rigid linkage between the back of the barrel and the strain gauge, and the strain gauge itself would have to be extremely rigid. If any part of the gun accelerates backward at all,...