Okay so last night I was playing with my camera and a lighted arrow nock, the main purpose was to take a cool picture. But after examining the picture I noticed something interesting.
The arrow flight is what interested me.
first thing I noticed when I zoomed in 100% on the initial flight was a very slight wobble in the beam of light . . . I figured it was either paradox or my flight is not the best . . . since its only near the beginning I am going with paradox.
The second thing I noticed was the flatness of the flight for the first 30 yards and then it seemed to arc down. It is possible that the camera angle had something to do with it??? Here look for yourself . . .
(http://i959.photobucket.com/albums/ae73/Guitararcher/DSC_1008.jpg)
So tonight I think I want to try and get two more shots, one over my shoulder, and one from a side view to look at the arc . . .
o and also the distance was 45 yards and the shot impacted right behind the liver, the deer is quartering away approx. 25 degrees
Very cool pic Chris. What kind of camera are you using?
Very interesting !
Dan
That's absolutely amazing. What bow set up are you shooting?
That can't do anything but help your memory re: trajectory!! Cool pic, too.
That's cool.What I can think is that the added weight in the nock end portion can have changed the spine on your arrow.
That is interesting. It will be cool to see the other shots.
Great idea!
Jon, Good to see you over here! "White Falcon"!
chris-very interesting and keep us posted on the rest of your experiment! we are very eager for the results and any other conclusions you come to. thanks.
kennyb
Very cool,thanks for shar'n.
Very interesting and cool.
Thanks guys,
The camera is a Nikon D5000
The bow in the picture is a 55# deer master take down, launching a 29.5 inch Beeman ICS bowhunter shaft with a 100 grain brass insert and a 100 grain feild tip so about 475 total grains including the feathers and the nock . . .
cacciatore that is possible, I didn't notice a difference in flight with my naked eye . . . but you can see the little squiggle in the beam there in the beginning . . . very good possibility though!!
Can't wait to see the over the shoulder shot!
GLENN
Alright, so I went out again tonight to do some experimenting.
The first one is just a side view, and unfortunately the nock is starting to die, so it is very light in the picture . . .but you can clearly see that the arrow is really flat for only about 10 yards, and then it starts to arc
(http://i959.photobucket.com/albums/ae73/Guitararcher/DSC_0077.jpg)
This one is good, Cacciatore I think you are right now, in the one photo you can clearly see some cork screw action.
(http://i959.photobucket.com/albums/ae73/Guitararcher/DSC_0075.jpg)
its not the over the shoulder shot I wanted, but it got dark on me, so Im gonna try again tommorrow!!
Keep trying cause these pics are awesome! Helluva practice area you got going too Chris. I'd have a tough time leaving that setup.
The flat flight may be a result of camera lens distortion of depth of field, for starters, and perspective from where the camera was located.
A few years ago The Smithsonian Magazine did a study to understand why a curve ball appears to drop suddenly when viewed from the perspective of the batter. As it turned out the flight of the ball, and its arc, was constant. It only APPEARS to drop like a rock just before it reaches the batter, thus appearing to him that it will be a hittable. The same thing with an arrow seemingly to fly flat for much of its flight only to drop rapidly later.
Anyway, the arrow is certainly on a constant path and arc. It only appears to fly flat.
Very neat photos BTW!
Joshua
Very cool!
Ballistics says it can not be flat. I think you are getting a distorted view. Try the camera behind the deer at a slight angle pointing to you
Thats pretty cool
Cool pics. I'm sure we will have some physics guys in to explain what is "really" happening but that is REALLY neat photography. Send it to mythbusters?
Trajectory is a parabla, not a curve. The air resistance is cutting your speed until you will have lost enough that most of your your momentun is gone, the arrow (or bullet) will dive. Bill
Look how long the limbs are still vibrating in relation to how far the arrow has gone down range. Do you have any idea the time in flight?
I would have thought there would be more arc in the flight path. Must be a darned fast bow for a 45 yard shot.
Waiting to see the rest of the pictues.
Kip
That's cool. Do you have a really heavy arrow to try? Like one around 600 grains? It would be neat to see the difference in trajectories.
Thanks for the pics this is a really cool idea. It would be interesting to compare those arrows to heavier ones to see the difference.
I've found that between 15 and 35 yards the trajectory of my arrow is about 4 or 5 inches, that is the distance between hi and low points. After that the arrow drops off significantly.
Try it. Put a small marker on a large backstop and then use the tip of your arrow as a sight. Start at 5 yards and shoot several arrows placing the tip of the arrow on the mark the way you would with a sight pin. The arrows will impact above the mark. Measure the distance between the mark and the group you just shot.
Repeat this at 5 yard intervals up to 40 yards. You should see a relatively flat trajectory up to 30 or 35 yards then the arrows will really begin to drop off.
This is for a 55-60 lb bow and 500 grain arrows, and yes your results may vary.
JW
Very cool, keep them comming it is realy interesting!!
If you draw a line from the archer's eye to the point of impact you will see the arrow is below the line of sight rises above it and then drops into the target where the line of sight ends
Part of the reason the early flight looks flatter is because as the arrow leaves the bow it is actually rising (above the line of sight to the target), peaks as gravity overcomes the upward velocity, and then starts to descend gainging downward speed the longer it is falling add fletching drag and that is why you get that dramatic drop at the end (parabolic flight)
Very interesting to observe. Thanx for sharing.
Very cool experiment. Part of the reason for more rapid 'falling' at the end is because that is what's happening as the arrow looses speed it also falls more for every few feet of forward motion. On really long shots the arrow will almost seem to 'hover' as it is coming in to impact the target. I guess that is what Chop said too.
Similarly an out of spine bareshaft will drift left or right when it gets beyond 20 yards and starts to slow down.
Guys, this is because gravity is not a constant, it's an acceleration. Falling objects increase velocity by 32.2 ft/s or 22 mph every second. Ignoring wind resistance an object starting from rest (0 ft/s) will reach 32.2 ft/s after one second, 64.4 ft/s after two seconds, and so on. Thus the arrow will drop faster at the end and you'll see an arc like you did (the arc is because of the increasing rate of vertical drop). Also the arrow slows down and thus will travel in more of an arc than if it didn't.
Keep it coming this is very interesting.