Air Arms Owners Club

When people don't understand basic physics. Apparently a pellet rises when it leaves the barrel! Read the bit from secretagentmole.
http://www.thehuntinglife.com/forums/to ... oop/page-2

Nothing to do with Physics.... sights are above the barrel therefore the fixed zero point creates the arc he describes.

It is not climbing but it is heading in an upward trajectory

Smudgerii wrote:Nothing to do with Physics.... sights are above the barrel therefore the fixed zero point creates the arc he describes.

It is not climbing but it is heading in an upward trajectory

He argues that the pellet rises when it leaves the barrel before falling. Totally impossible, the upward trajectory is due to the barrel pointing upward relative to the scope.

Timmytree wrote:

Smudgerii wrote:Nothing to do with Physics.... sights are above the barrel therefore the fixed zero point creates the arc he describes.

It is not climbing but it is heading in an upward trajectory

He argues that the pellet rises when it leaves the barrel before falling. Totally impossible, the upward trajectory is due to the barrel pointing upward relative to the scope.

Where in your linked post does he say that?

I can see where you say it drops as soon as it leaves, and thats after saying it has a “high point” in it’s flight...

Er except they do not start to drop as soon as they leave the barrel, they actually fly in an arc.


Will that do?

Timmytree wrote:Er except they do not start to drop as soon as they leave the barrel, they actually fly in an arc.


Will that do?

No! Not what you claimed he said...

your claim of it immediately dropping is also incorrect. It is not immediate, gravity has to overcome the velocity of the pellet. Just a matter of Physics really

TenMetrePeter wrote:

images.jpg

Thanks for the diagram Peter, it fits nicely with this bit that I've posted for secretagentmole.


By B.B. Pelletier
Where to zero a scope is a question that always starts a friendly conversation among airgunners. I’ll tell what your options are and leave the final choice to you.
Pellets start to fall the minute they leave the muzzle
The moment a pellet (or bullet) leaves the muzzle, it begins falling toward the ground. It falls at the same rate it would if you dropped it from the height of the bore – assuming the bore is parallel to the ground! And that’s where the scope adjustment comes in.
Because a scope looks straight out and because it is mounted above the bore, it can only be made to intersect the trajectory of the pellet if it points down through the ballistic path the pellet takes. And, that is how scopes are sighted-in.
They are adjusted to look straight through the downward arcing trajectory of the pellet at a point close to the muzzle. When the pellet arrives at the spot where the downward-looking scope is pointing, the crosshairs will be exactly where the pellet is and the scope will be zeroed at that distance.
Beyond this point, the scope will actually be looking UNDER THE PELLET’S FLIGHT for a certain distance after the first point of intersection. Then the falling pellet will cross back through the scope’s line of sight once more, intersecting the pellet a second time and creating a second zero point.
How we correct the picture!
Nobody likes to think about their pellet falling, so we elevate the barrel so the pellet is actually going slightly upwhen it leaves the gun. Now, the whole thing makes more sense.
The pellet SEEMS to be rising when, in fact, it is only doing so because the barrel is tilted slightly up at the muzzle. The downward-looking scope intersects the pellet at some distance downrange, then the pellet SEEMS TO RISE above the straight line of the scope and intersect a second time further downrange.
What’s a good distance to sight-in a scope?
Now that we understand how it works, we need to find the right distance to sight-in. You now understand that the scope will actually be zeroed for TWO DISTANCES instead of one.

Your cut and paste confirms what was posted by the other party in your link... so what is your point?

It still stands that for a fraction of a second velocity overcomes gravity.

Smudgerii wrote:Your cut and paste confirms what was posted by the other party in your link... so what is your point?

It still stands that for a fraction of a second velocity overcomes gravity.

Never, and certainly not for 25 yards. I'll stand by my outdated education, no projectile fired at any angle can overcome gravity. If so, Isaac Newton would have seen apples falling skywards.