Long Range - 210 yards with Kalibr Cricket .25

[Frog]

The video subtitles do state that slow motion is being used.
How has gravity got anything to do with the time it takes a pellet to travel 210yards? Surely it is the power of the rifle and the pellet used which affect the speed of the pellet to traverse the 210yards that are the relevant factors? If I look at Chairgun and plug in 12fpe using a .177 Bisley Long Range Gold pellet it takes 1.6 seconds to traverse 210yards on a level playing field. Where does the rate with which gravity affects a pellet come into that?
Jim

We were working out the time the pellet was in the air from the reported pellet drop i.e. Time = the square root of twice the distance of fall over g .

Fall reported as 32 feet. Therefore: twice 34 =64 divided by g (32ft/sec/sec) = 2 -> square root of 2 = 1.41seconds flight time - simples!

The error of course is the pellet was not fired at 0 degrees elevation... However given we did not know the power of the rifle a reasonable estimate.

[Dagwood]

We were working out the time the pellet was in the air from the reported pellet drop i.e. Time = the square root of twice the distance of fall over g .

Fall reported as 32 feet. Therefore: twice 34 =64 divided by g (32ft/sec/sec) = 2 -> square root of 2 = 1.41seconds flight time - simples!

The error of course is the pellet was not fired at 0 degrees elevation... However given we did not know the power of the rifle a reasonable estimate.

I'm not criticising your maths when you calculate the time an item might drop 32ft under normal conditions, my point is that it doesn't take into account the projectile speed to the target. If I was to shoot the same rifle and pellet at a target 64ft lower than the firing point yet half the distance I would expect the pellet to take half the time and I wouldn't be using gravity to calculate the time taken for the pellet to get there. Of course, as you say if there is a significant difference in height there would be some inclination of the rifle barrel and therefore normal gravity calculations aren't entirely relevant.
Forgive me if I am missing your point but I still feel it is distance and pellet velocity that are the main factors in calculating travel time and perhaps as you say it has turned out to be a reasonable estimate this time.
Jim

[Frog]

I'm not criticising your maths when you calculate the time an item might drop 32ft under normal conditions, my point is that it doesn't take into account the projectile speed to the target. If I was to shoot the same rifle and pellet at a target 64ft lower than the firing point yet half the distance I would expect the pellet to take half the time and I wouldn't be using gravity to calculate the time taken for the pellet to get there. Of course, as you say if there is a significant difference in height there would be some inclination of the rifle barrel and therefore normal gravity calculations aren't entirely relevant.
Forgive me if I am missing your point but I still feel it is distance and pellet velocity that are the main factors in calculating travel time and perhaps as you say it has turned out to be a reasonable estimate this time.
Jim

Gravity is a constant Jim - drop a stone with one hand and at the same time shoot a high velocity rifle with the other (at the same height above ground and zero elevation) and the stone and bullet hit the ground at the same time. OR drop a stone from 32 feet and shoot a rifle from 32 feet above ground and the stone and pellet hit the ground at the same time - 1.41 seconds after you drop / fire.

What velocity change does, is depending on which way you look at it, alter the time gravity has to act on the projectile for a given distance OR determine how far the projectile gets before it hits the ground: what it does not do is alter the time taken to hit the ground because gravity is a constant.

The calculation uses three elements g (gravity), d (distance fallen), and t (time). Know any two of these and you can work out the third - in this case we knew g and d so could calculate t.

[Dagwood]

Gravity is a constant Jim - drop a stone with one hand and at the same time shoot a high velocity rifle with the other (at the same height above ground and zero elevation) and the stone and bullet hit the ground at the same time. OR drop a stone from 32 feet and shoot a rifle from 32 feet above ground and the stone and pellet hit the ground at the same time - 1.41 seconds after you drop / fire.

What velocity change does, is depending on which way you look at it, alter the time gravity has to act on the projectile for a given distance OR determine how far the projectile gets before it hits the ground: what it does not do is alter the time taken to hit the ground because gravity is a constant.

The calculation uses three elements g (gravity), d (distance fallen), and t (time). Know any two of these and you can work out the third - in this case we knew g and d so could calculate t.

I can't disagree with anything you say regarding gravity and the effect distance fallen has on time taken. I think the point I was trying to make, and possibly haven't made it very clear , is that I hadn't observed or heard that the distance the pellets dropped was " a reported 32ft" I thought it was just Spitzer who had introduced that figure in his first post. If I have missed that in the video then i apologise and have to agree entirely with your calculated time taken. To be honest, And I probably need to take another viewing of the video, I thought they were shooting up a slight incline.
A good video and an interesting thread.
All best
Jim

[nnuunn]

I noticed you guys don't seem to shoulder the rifle for the camera, how do you keep the rifle stable without holding it against your shoulder?