mauser06

your right...the deer are ducking...but its like Rob said...a duck before a jump...after they go so low they jump and are gone.

i find it amazing that they can do such a thing. i had it happen last year. i learned my problem was shooting an alert deer. wish i knew that before i let loose that arrow...video footage of them ducking is amazing. i forget the real numbers...but within normal hunting range, they have less than a second of arrow flight to duck. amazing they can hear the noise, process it as danger, THEN decide to start to take off, which starts with ducking, which is when most arrows seem to impact them..or miss them completely.

i really wish i knew how to run the numbers...hmmm maybe i could actually....i will read over it tonite...if i get my homework done...id like to see the numbers...

LebeauHunter

mauser,

I don't think the deer "process" the noise. It is an inherent flight reaction to being startled, like reflexes.

quiksilver

fps 100 150 200 250 300 350 400
yds T I M E
10 .27 .17.12 .09 .07 .06.05
20 .54 .34 .24 .18 .14 .11 .09
30 .81 .51 .36 .27 .21 .17 .14
40 1.08 .68 .48 .36 .28 .23 .18
501.35 .85 .60 .45 .35 .28 .23
60 1.62 1.02 .72 .54 .42 .34 .27


(I did NOT account for the arrow slowing down downrange - too complicated)

Not sure if this is right (I'm no engineer)

Distance (ft) Distance (ft)
__________minus ___________ = time

F/S 1137 ft

davidmil

If ya'll would shoot a Guardian they won't hear anything. [8D] Yup, they jump the string...NOT!! Rob has the correct answer. They're preloading so they can make a getaway. If you get a deer that can preload and then jump before the arrow hit... he's too far away and your bow is noisy.LOL

BackwoodsBuck

The blue numbers are the speed of the arrows, the green numbers are the distance to the target in yards, and the red numbers are how much longer it takes the arrow to reach the target than the sound (assuming I did not make a mistake).


distance
speed 10 20 30 40 50 60
200 0.123404 0.246809 0.370213 0.493617 0.617021 0.740426

220 0.109768 0.219536 0.329304 0.439072 0.548839 0.658607

240 0.098404 0.196809 0.295213 0.393617 0.492021 0.590426

260 0.088789 0.177578 0.266367 0.355155 0.443944 0.532733

280 0.080547 0.161094 0.241641 0.322188 0.402736 0.483283

300 0.073404 0.146809 0.220213 0.293617 0.367021 0.440426

320 0.067154 0.134309 0.201463 0.268617 0.335771 0.402926

340 0.06164 0.123279 0.184919 0.246558 0.308198 0.369837



Below is a graph of the amount of time it takes each item (sound, arrow at 200 fps, 220 fps, etc) to reach the target assuming ideal conditions of a vacuum (i.e. constant speed, no slowing down due to drag). It is close enough to give you an idea of what happens.

quiksilver

Thanks Backwoods - that's the illustration I was going for. Try that graph again - I can't see it. Getting the dreaded red X.

BackwoodsBuck

I did it slightly different, but your answers are close enough to mine to call it rounding differences, so I think we can call them right.

Oh, and I am an engineer.

BackwoodsBuck

No prob, maybe now you can see it. Keep in mind that the graph is not the same info as the table. The graph shows the time it take to get to the target, not the difference in time between the arrow and sound.