Jump the string!
09-21-2008, 07:15 AM
#1
Thread Starter
Join Date: Aug 2008
Location: Connecticut
Posts: 223
Jump the string!
I cannot take credit from this, I stole it from another forum. Very good information though. Stole the post from a guy named Timbow. Enjoy!
I got bored waiting for the season to start and I started wondering just how much can a deer jump the string at different distances and how much does this change with differing arrow speeds. I first calculated the time it takes an arrow to reach the target. I then calculated the time it takes sound to reach the target and subtracted this number from the time it takes the arrow to reach the target. This gives you the time the deer has to react(without taking into account the time it takes the nerves to send the message from its ears to its brain to duck and its brain to its legs). I then took this reaction time and plugged it into a formula that determines how far an object falls in a given time due to acceleration due to gravity (this is the fastest a deer could possibly duck). I used 300fps and 250fps for comparison and came up with the following. (All formulas are listed first.)
Distance Fallen=0.5 x 386in/sec squared x time squared
Time = Distance/Speed
Speed of Sound=1100f/s
40 yards at 300f/s=.4s for arrow to reach target
40 yards at 1100f/s=.11s for sound to reach target .29s for target to react
Distance target falls=16in
40 yards at 250f/s=.48s for arrow to reach target
40 yards at 1100f/s-.11s for sound to reach target .37s for target to react
Distance target falls=26in
30 yards at 300f/s=.3s for arrow to reach target
30 yards at 1100f/s=.08s for sound to reach target .22s for target to react
Distance target falls=9.4in
30 yards at 250f/s=.36s for arrow to reach target
30 yards at 1100f/s=.08s for sound to reach target .28s for target to react
Distance target falls=15.13in
20 yards at 300f/s=.2s for arrow to reach target
20 yards at 1100f/s=.05s for sound to reach target .15s for target to react
Distance target falls=4.3in
20 yards at 250f/s=.24s for arrow to reach target
20 yards at 1100f/s-.05s for sound to reach target
.19s for target to react
Distance target falls=7in
10 yards at 300f/s=.1s for arrow to reach target
10 yards at 1100f/s=.03s .07s for target to react
Distance target falls=.95in
10 yards at 250f/s=.12s for arrow to reach target
10 yards at 1100f/s=.03s .09s for target to react
Distance target falls=1.6in
As you can see, speed makes less of a difference in the reaction of a deer as the range decreases, which makes sense. You can also see that even at 300fps, a deer can drop up to 4.3 inches at just 20 yards which would result in a very high hit even at this close of a distance. This shows how important a quiet bow is so that its sound doesn't cause an immediate flight reaction in the deer. It also shows why taking shots at highly alert deer is a bad idea even at relatively close ranges. I hope maybe someone will find it interesting...
I got bored waiting for the season to start and I started wondering just how much can a deer jump the string at different distances and how much does this change with differing arrow speeds. I first calculated the time it takes an arrow to reach the target. I then calculated the time it takes sound to reach the target and subtracted this number from the time it takes the arrow to reach the target. This gives you the time the deer has to react(without taking into account the time it takes the nerves to send the message from its ears to its brain to duck and its brain to its legs). I then took this reaction time and plugged it into a formula that determines how far an object falls in a given time due to acceleration due to gravity (this is the fastest a deer could possibly duck). I used 300fps and 250fps for comparison and came up with the following. (All formulas are listed first.)
Distance Fallen=0.5 x 386in/sec squared x time squared
Time = Distance/Speed
Speed of Sound=1100f/s
40 yards at 300f/s=.4s for arrow to reach target
40 yards at 1100f/s=.11s for sound to reach target .29s for target to react
Distance target falls=16in
40 yards at 250f/s=.48s for arrow to reach target
40 yards at 1100f/s-.11s for sound to reach target .37s for target to react
Distance target falls=26in
30 yards at 300f/s=.3s for arrow to reach target
30 yards at 1100f/s=.08s for sound to reach target .22s for target to react
Distance target falls=9.4in
30 yards at 250f/s=.36s for arrow to reach target
30 yards at 1100f/s=.08s for sound to reach target .28s for target to react
Distance target falls=15.13in
20 yards at 300f/s=.2s for arrow to reach target
20 yards at 1100f/s=.05s for sound to reach target .15s for target to react
Distance target falls=4.3in
20 yards at 250f/s=.24s for arrow to reach target
20 yards at 1100f/s-.05s for sound to reach target
.19s for target to react
Distance target falls=7in
10 yards at 300f/s=.1s for arrow to reach target
10 yards at 1100f/s=.03s .07s for target to react
Distance target falls=.95in
10 yards at 250f/s=.12s for arrow to reach target
10 yards at 1100f/s=.03s .09s for target to react
Distance target falls=1.6in
As you can see, speed makes less of a difference in the reaction of a deer as the range decreases, which makes sense. You can also see that even at 300fps, a deer can drop up to 4.3 inches at just 20 yards which would result in a very high hit even at this close of a distance. This shows how important a quiet bow is so that its sound doesn't cause an immediate flight reaction in the deer. It also shows why taking shots at highly alert deer is a bad idea even at relatively close ranges. I hope maybe someone will find it interesting...
09-21-2008, 08:29 AM
#2
Fork Horn
Join Date: Sep 2008
Location: Scranton, PA
Posts: 408
RE: Jump the string!
Yes this is a great post and this is why everyone should buy a bowtech to make sure you have the quietest bow on the forums...lol j/k Yeah i had a darton and it was super quiet and I nailed a nice PA 10 pointer 2 years ago on Privte Land.
09-21-2008, 12:08 PM
#4
Nontypical Buck
Join Date: Oct 2006
Location: Deer Country
Posts: 2,244
RE: Jump the string!
Deer don't "duck"....they don't say to themselves "Oh Shi% here comes a arrow...DUCK!!!"....they are simply reacting to a strange sound, and the "ducking" motion is just the transfer of energy into there legs to bolt as fast as they can.
09-21-2008, 01:00 PM
#6
Join Date: Jan 2008
Location:
Posts: 188
RE: Jump the string!
WOW, Someone was really bored! Or way to much time onthere hands.......one of the two! LOL Just kidding!
Good information......
Now I'm gonna See how much time it takes for my eyes to Read it again and how long it take the brain to comprehend it.......
See ya'll next week!! haha Another joke
Good information......
Now I'm gonna See how much time it takes for my eyes to Read it again and how long it take the brain to comprehend it.......
See ya'll next week!! haha Another joke
