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Started By
Message
1
Posted on 10/18/13 at 10:43 am to Hammertime
I guess my anchor point changes making me shoot diff.
I believe yal. was just asking why they would make pendulum sights of it didnt change from elevation.
I believe yal. was just asking why they would make pendulum sights of it didnt change from elevation.
Posted on 10/18/13 at 10:44 am to AlxTgr
No, just no
Posted on 10/18/13 at 10:47 am to Hammertime
(a)
(b)
(b)
quote:
In the case of the Uphill Shot (a), what distance should the shooter use? Many archers give answers like "since it's uphill, just a little over 20 yards" while others give the answer "just a little under 20 yards". The correct answer is 10 yards. Even though the target is a full 20 yards away, the effect of gravity only acts during the horizontal travel component of the arrow. Now, for the tricky one: what distance should the shooter in the tree stand use? The answer is 7 ft. Again, gravity only affects the arrow over its horizontal travel of 7 feet.
Posted on 10/18/13 at 10:48 am to Hammertime
Posted on 10/18/13 at 10:49 am to greasemonkey
Why do you think hundreds of billions of pogs were sold in the 90s? It is because people are dumb and will buy that shite
Posted on 10/18/13 at 10:50 am to mylsuhat
quote:
if you shoot a gun horizontally and drop a bullet from the same height at the same time, they will hit the ground at the same time. Same logic applies here
Posted on 10/18/13 at 10:52 am to AlxTgr
quote:
At ranges beyond 20 yards, Parallax Error changes very slowly with range and is hardly noticeable. However, at ranges below 15 yards Parallax Error changes very rapidly.
Posted on 10/18/13 at 10:54 am to AlxTgr
What part of that is supposed to prove hundreds of years of physics wrong?
Posted on 10/18/13 at 10:55 am to Hammertime
quote:The physics isn't wrong.
What part of that is supposed to prove hundreds of years of physics wrong?
Posted on 10/18/13 at 10:56 am to TheDrunkenTigah
Looks like we go a good ole scrap a brewing...
Posted on 10/18/13 at 11:01 am to AlxTgr
parallax error only has to do with the distance between the initial arrow, peep, and final target, not the flight of the arrow or the amount gravity pulls it down
eta: it only affects your line of sight, not the flight of the arrow
eta: it only affects your line of sight, not the flight of the arrow
This post was edited on 10/18/13 at 11:03 am
Posted on 10/18/13 at 11:02 am to Hammertime
quote:
parallax error only has to do with the distance between the initial arrow, peep, and final target, not the flight of the arrow or the amount gravity pulls it down
Posted on 10/18/13 at 11:07 am to Hammertime
quote:
What part of that is supposed to prove hundreds of years of physics wrong?
Yep, I'm no bow expert, but parallax error will occur no matter how high in the tree you are. It doesn't matter what the pitch of the bow is when it's fired, it's about peep relative to sight. The longest part of the triangle would have to be less than 20 yards for it to be a concern (meaning the deer is probably 5 yards from the base of the tree).
So yes, the actual distance (hypotenuse) does matter but the deer would have to be standing under the tree, which is not the situation OP is describing.
Posted on 10/18/13 at 11:08 am to Tail Dragger
20 yard
Posted on 10/18/13 at 11:13 am to TheDrunkenTigah
Parallax error does not effect the flight path of the arrow vertically. They are gonna fly how they are gonna fly. Gravity does though.
Eta: only horizontal force is wind resistance
Eta: only horizontal force is wind resistance
This post was edited on 10/18/13 at 11:17 am
Posted on 10/18/13 at 11:14 am to mylsuhat
But in bow hunting the arrow is shot towards the ground. It's going to get to the ground faster than if dropped and gravity will have less time to work on it. I think gravity acts over time not distance.
Posted on 10/18/13 at 11:18 am to Nodust
Your only talking about 14 yards away. If you are shooting 300 ft/sec. That arrow will get there in .14 seconds. Gravity wont have time to affect the flight of that arrow.
Posted on 10/18/13 at 11:18 am to Hammertime
It will, just like how a rifle shoots "high" at 40 yrds when sighted to 100, it's just not nearly as big of a concern as some are making it out to be. That's why pendulum sights are made made, but just look at how the pendulum works... you'll only notice it move a TON when you're aiming almost straight down. OP should be using horizontal distance, or just shooting his bow to get a feel for it.
Posted on 10/18/13 at 11:18 am to Hammertime
quote:
While it is true that gravity has the same time to act upon both bullets, the acceleration of gravity does not act equally on them relevant to the direction of drop. Remember, gravity is a vector. In this example, the bullet is a vector also. Vectors have both a magnitude (in the case of gravity, an acceleration of 32 fps/s) and a direction (vertically downward). Vector mechanics involves both the angles and the magnitudes of the involved vectors.
Now back to the horizontal bullet fired in shot one. By definition, horizontal is perpendicular to gravity. Therefore, gravity acts in a downward direction that happens to be perpendicular to the original path of this particular bullet. Therefore, the drop of the bullet is related directly to the TOF and the effect of the full magnitude of gravity (32 fps/s) because gravity in this case acts in exactly the same direction as drop. Simple concept; everybody understands this.
For the bullet fired in shot two it gets more complicated. You see that bullet has a vector direction of 45 degrees to horizontal, and to vertical. While gravity still acts vertically upon the bullet, the bullet is not traveling horizontally or perpendicular to gravity, so gravity no longer acts perpendicularly to the original path of the bullet, but at the 45 degree angle. (This is easier with a diagram.) In other words, gravity pulls the bullet vertically downward, but vertically downward in this case is not the same as drop. Drop, as I understand the definition, is the amount the bullet falls perpendicularly (but not necessarily vertically) away from the line of the original path (barrel). Since the barrel in this case is not horizontal, drop is not vertical.
and this.
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