Bow with only 4" of drop from 0-32yds.
03-12-2008, 03:18 PM
#21
Giant Nontypical
Join Date: Feb 2003
Location: HENDERSON KY USA
Posts: 6,634
RE: Bow with only 4" of drop from 0-32yds.
The original post is feasable except for the dead on at 0.The bow will be a couple inches low at the bow due to the sight paralax(line of sight above arrow) and then if the bow is zeroed from 25-28 yards,the trajectory would allow it to be just about what he said,especially if it isa reasonably fast bows,even a slower bow can be pretty close to it.
03-12-2008, 04:07 PM
#22
Nontypical Buck
Join Date: Jan 2005
Location: Upstate New York
Posts: 2,435
RE: Bow with only 4" of drop from 0-32yds.
ORIGINAL: OHbowhntr
Near as I can tell you need to be shooting about 700fps to get only 4" drop at 30yds. Now that's a FAST bow!!!
Near as I can tell you need to be shooting about 700fps to get only 4" drop at 30yds. Now that's a FAST bow!!!
03-12-2008, 04:09 PM
#23
Join Date: May 2005
Location: StL, MO
Posts: 745
RE: Bow with only 4" of drop from 0-32yds.
ORIGINAL: TFOX
The original post is feasable except for the dead on at 0.The bow will be a couple inches low at the bow due to the sight paralax(line of sight above arrow) and then if the bow is zeroed from 25-28 yards,the trajectory would allow it to be just about what he said,especially if it isa reasonably fast bows,even a slower bow can be pretty close to it.
The original post is feasable except for the dead on at 0.The bow will be a couple inches low at the bow due to the sight paralax(line of sight above arrow) and then if the bow is zeroed from 25-28 yards,the trajectory would allow it to be just about what he said,especially if it isa reasonably fast bows,even a slower bow can be pretty close to it.
03-12-2008, 04:13 PM
#24
Join Date: May 2005
Location: StL, MO
Posts: 745
RE: Bow with only 4" of drop from 0-32yds.
ORIGINAL: huntingson
Remember that the arrow has an initial velocity in the positive z-direction and gravity must first bring that initial velocity to zero, and then it would begin to actually drop. I bet your calculations are not taking that into account.
Remember that the arrow has an initial velocity in the positive z-direction and gravity must first bring that initial velocity to zero, and then it would begin to actually drop. I bet your calculations are not taking that into account.
03-12-2008, 04:20 PM
#25
Nontypical Buck
Join Date: Jan 2005
Location: Upstate New York
Posts: 2,435
RE: Bow with only 4" of drop from 0-32yds.
Well let's define drop. The way I think of drop is the amount a projectile would fall in a given distance if shot perpendicular with gravity. That puts it in perspective. If you aimed an arrow at the top of a building 30 yards away and it hit 3 stories above where you stand would you say the arrow didn't drop at all? Of course not. Anyway, the calculation I used assumes shot perpendicular with gravity.
03-12-2008, 04:30 PM
#26
Fork Horn
Join Date: Feb 2008
Location: South central MN
Posts: 116
RE: Bow with only 4" of drop from 0-32yds.
He was saying that the due to the arrow resting below the sight, the arrow will be at a somewhat upward angle. When it is fired, it initially has an upward velocity component. Gravity immediatly begins slowing that upward velocity, but it takes some time. So basically, he is saying gravity doesn't immediatly begin to decrease the distance from the arrows initial posistion to the ground. I don't have a clue what calculations people used to determine their numbers, and I'm no engineer so I wouldn't be able to calculate it myself either. However hornady's calculator shows that a 400 grain projectile at 300 fps and a 2" sight height with a 17 yd zero would be -2" at 0yds, 0" at 17yds, and -2.9" at 25yds.
Can anybody calculate the MPBR (+/-2") for a 400 grain projectile, 300/350 fps, and no drag (it isn't that much a factor at those velocities/distances anyway) and see what in an ideal condition an arrow could do?
Can anybody calculate the MPBR (+/-2") for a 400 grain projectile, 300/350 fps, and no drag (it isn't that much a factor at those velocities/distances anyway) and see what in an ideal condition an arrow could do?
03-12-2008, 05:33 PM
#27
Nontypical Buck
Join Date: Jul 2007
Location: Virginia
Posts: 3,882
RE: Bow with only 4" of drop from 0-32yds.
Well get this LOAD.... The guy at the local PSE shop says the X-force uses 1-pin, thats right, 1-PIN all the way to 50 YARDS!! And will shoot the 340fps with any arrow, as other brand bows that say that, you have to use "their" arrow....
The guys trying to make a living, but i cant stand to here him talk about PSE.
The guys trying to make a living, but i cant stand to here him talk about PSE.
03-12-2008, 07:12 PM
#28
Nontypical Buck
Thread Starter
Join Date: Feb 2007
Location: SE Ohio
Posts: 2,531
RE: Bow with only 4" of drop from 0-32yds.
ORIGINAL: TFOX
The original post is feasable except for the dead on at 0.The bow will be a couple inches low at the bow due to the sight paralax(line of sight above arrow) and then if the bow is zeroed from 25-28 yards,the trajectory would allow it to be just about what he said,especially if it isa reasonably fast bows,even a slower bow can be pretty close to it.
The original post is feasable except for the dead on at 0.The bow will be a couple inches low at the bow due to the sight paralax(line of sight above arrow) and then if the bow is zeroed from 25-28 yards,the trajectory would allow it to be just about what he said,especially if it isa reasonably fast bows,even a slower bow can be pretty close to it.
TFOX,
You have OnTarget or something like that, I remember seeing it once on here, draw a trajectory of an arrow traveling at 400fps, and see how high above a a level line from 0-32yds it goes, and I know there ain't nothing out there shooting 400fps, but that still won't get it anyhow. This guy claimed a maximum of 2" above the bull and nothing below the bull out to 32yds with ONE PIN being held DEAD ON, no overhold or underhold!!!
03-12-2008, 07:22 PM
#29
Nontypical Buck
Join Date: May 2006
Location: IA/WI/IL
Posts: 1,482
RE: Bow with only 4" of drop from 0-32yds.
ORIGINAL: mnbirddog
He was saying that the due to the arrow resting below the sight, the arrow will be at a somewhat upward angle. When it is fired, it initially has an upward velocity component. Gravity immediatly begins slowing that upward velocity, but it takes some time. So basically, he is saying gravity doesn't immediatly begin to decrease the distance from the arrows initial posistion to the ground. I don't have a clue what calculations people used to determine their numbers, and I'm no engineer so I wouldn't be able to calculate it myself either. However hornady's calculator shows that a 400 grain projectile at 300 fps and a 2" sight height with a 17 yd zero would be -2" at 0yds, 0" at 17yds, and -2.9" at 25yds.
Can anybody calculate the MPBR (+/-2") for a 400 grain projectile, 300/350 fps, and no drag (it isn't that much a factor at those velocities/distances anyway) and see what in an ideal condition an arrow could do?
He was saying that the due to the arrow resting below the sight, the arrow will be at a somewhat upward angle. When it is fired, it initially has an upward velocity component. Gravity immediatly begins slowing that upward velocity, but it takes some time. So basically, he is saying gravity doesn't immediatly begin to decrease the distance from the arrows initial posistion to the ground. I don't have a clue what calculations people used to determine their numbers, and I'm no engineer so I wouldn't be able to calculate it myself either. However hornady's calculator shows that a 400 grain projectile at 300 fps and a 2" sight height with a 17 yd zero would be -2" at 0yds, 0" at 17yds, and -2.9" at 25yds.
Can anybody calculate the MPBR (+/-2") for a 400 grain projectile, 300/350 fps, and no drag (it isn't that much a factor at those velocities/distances anyway) and see what in an ideal condition an arrow could do?
Weight has no influence on how fast an object drops. I came up with, using constant acc. equations that are standard, an upward velocity V(y) due to that slight upward tilt of the arrow of 5.7 fps to give it a max of 2" of height before the arrow starts falling. Transfer the numbers into the X direction using the same equations and away you go....
03-12-2008, 07:22 PM
#30
Giant Nontypical
Join Date: Feb 2003
Location: HENDERSON KY USA
Posts: 6,634
RE: Bow with only 4" of drop from 0-32yds.
My program is down but I have run that scenario many times on it.
Remember that the pin is set for 25-28 yards.The drop from there to 32 on a fast bow will be around 4" which is exactly what he says he shoots low,now all that is left is to figure how high will the arrow be at it's highest point,my experience tells me about 3".WHEN 0 IS27 YARDS.
It just can't be dead on at the bow due to sight paralax,(arrow is below the pin)
Remember that the pin is set for 25-28 yards.The drop from there to 32 on a fast bow will be around 4" which is exactly what he says he shoots low,now all that is left is to figure how high will the arrow be at it's highest point,my experience tells me about 3".WHEN 0 IS27 YARDS.
It just can't be dead on at the bow due to sight paralax,(arrow is below the pin)