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Main Boards => PowWow => Topic started by: two4hooking on August 14, 2013, 09:02:00 AM
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Here is a screen shot from below as I was shooting yesterday. Amazing how the string reacts....you would not know it.
(http://i481.photobucket.com/albums/rr180/two4hooking/string_zpsc989764d.jpg) (http://s481.photobucket.com/user/two4hooking/media/string_zpsc989764d.jpg.html)
te bow is a Schulz Tembo with 15 strand B50 and is whisper quiet and smooth.
Greg
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Wow that looks like the string broke.
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this was an ordinary shot? not a broken string?
crazy
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I have seen this same thing in some pics a friend of mine took. It is crazy. It makes you wonder how the string ever stays on the bow?
Bisch
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WOW, Greg, that is an amazing picture. I guess that shows why you need to have the string loops fit really well, huh?
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Man that is CRAZY!!!!!
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Here is the full vid:
(http://i481.photobucket.com/albums/rr180/two4hooking/th_crazystring_zpsfe84dcca.jpg) (http://i481.photobucket.com/albums/rr180/two4hooking/crazystring_zpsfe84dcca.mp4)
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That is really cool!
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wow!!
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Thats crazy.
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If I didn't see the video I wouldn't believe that the string would react like that. It truly is crazy. Thanks for the post.
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Are you shooting too light of an arrow?
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Now I know why I wear an armguard! :eek:
Be neat to take some pics with other FF string materials and see if there is a difference. I wonder if that contributes to the b-50,
"Booooiiiiinnnnng"
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I'm with Goshawkin - I'd love to see a video with the same bow and same arrow, but with a lighter, FF string. I've seen some pretty wild video's of string actiion before, but that one really takes first place. I do know that I had a longbow that smacked the daylights out of my forearm on every shot. I sold the bow, but later bought a very similar bow in left hand which happened to have a FF string on it and experienced no problems.
I know - different bow, different arm, possibly improved shooting form, but it still would be interesting, (if your bow is FF capable) to see a comparison.
Thanks for posting this one!
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Arrow BH combo was around 630 grains at about 58 pounds draw. I would assume since B50 stretches more there might be even more pronounced reactions as there is less give with FF...
I may have to make up a FF string and try it sometime....
I can tell you B50 is quieter out of this bow.
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What did you take the video with? If you used an iPhone or similar, the sensor used can cause pretty crazy effects when filming fast-moving objects. I've taken 400FPS and 1200FPS high-speed videos of my bows being fired and the strings never looked anything like that.
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I would think that is impossible...?
How could a string have those types of bends in it if it is still stretched out by the bow? Seems like it must be a video effect such as was suggested earlier.
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OK, I found the skinny FF string the bow was shipped with and recreated the shot:
(http://i481.photobucket.com/albums/rr180/two4hooking/FFString_zps89e4feff.jpg) (http://s481.photobucket.com/user/two4hooking/media/FFString_zps89e4feff.jpg.html)
Full Vid:
(http://i481.photobucket.com/albums/rr180/two4hooking/th_FFstringfilm_zps9d2adaea.jpg) (http://i481.photobucket.com/albums/rr180/two4hooking/FFstringfilm_zps9d2adaea.mp4)
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OK, now I'm totally convinced that effect is purely caused by the camera's sensor. Look at the limb at the upper left of the shot - since it's moving, it's subject to the same sensor aberration and looks totally kinked.
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YEP...weird camera science going on.
there is no possible way a non-stretch string can be that "loose" while the bow is fairly straight....
kinda like the ol' rubber pencil trick.
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that is crazy. first thing i thought when i seen the picture was that the string broke.
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I've seen quite a few "high frame/sec" slow motion shots that show the string stretching when the limbs reach brace hight, allowing the limbs to de-flex lower than brace height and then bounce back leaving slack in the string. I've seen the string bounce back and forth several times , nailing the shooter's forearm several times - usually on the rebound cycle. Never saw one quite this wild. There does seem to be a huge difference between the skinny string and the heavier B-50 string, even if the first video is distorted.
Sure makes for a wild video.
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I think it's just the video playing tricks on us.
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wow :scared:
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If it was the rubber pencil trick there would be some blurring going on right? Those images are pretty sharp.....
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Apparently, once the bow lets go of the arrow there is a complex set of recoil reactions that makes the string react faster than the bow limbs. The kink in the bottom limb surprises me, the bow must be going through it own thing. What I wonder, if the reaction in the bow will always show the same reaction and what that does to the feel and performance of the bow.
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That is amazing. Never would have dreamed it would be that dramatic
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Originally posted by two4hooking:
If it was the rubber pencil trick there would be some blurring going on right? Those images are pretty sharp.....
It's not exactly the rubber pencil trick, but it's a similar concept. Many cell phone sensors don't capture the each frame instantly - rather than grabbing a single image every ~1/60th of a second, they grab "slices" of the image and composite them as they go. This has the effect of when a fast-moving oscillating object is filmed, you get a "wave" effect as the camera sees the object in different positions over time as the "slices" captured move across the frame.
It's a bit tough to explain, but here's an older vid of mine of a 50# bow shot at 400 frames per second with a camera sensor that captures full frames instead of "slices.". You'll see the string oscillate, but there's no "bouncing" or snake effect.
http://www.youtube.com/watch?v=u__f-V5bNs8
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exactly..
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That's really weird!! Thanks.
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It looks to me that a lot of the string whip could be caused by shooting 3 under? Greg could you film it again shooting split finger?
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:thumbsup:
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Originally posted by JB:
It looks to me that a lot of the string whip could be caused by shooting 3 under? Greg could you film it again shooting split finger?
That was split finger......the only way to shoot a Hill longbow :saywhat:
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Sorry. My mistake
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I did a slomo vid of one of my bows a while back, and had similar results. I had no idea that the string looks like it is going to unstring itself on the shot. I'm glad to see that my bow wasn't alone. Who'd a thunk it??
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Crazy!
My original thoughts were:
Wooden bow? How much string follow when unstrung?
It almost looked like the limbs sent the string with a lot of initial speed but had a hard time to catch up with the string. No matter the stretch, no string will stretch that much. Just measure the loops in the picture. :0
But I think CatSplat nailed it:
Camera lens distorsion sounds like the most plausible explanation. Try filming the same shot (bow/arrow/string setup) with a regular video camera. No need for slowmo since the effect was noticeable without slowing the film. Also, if the string did that and if we can see it that clearly without slowing the film down, shouldn't we be able to observe the same effect directly?
Edit: ooops, I just saw it. It's a schultz tembo. So string follow is out of the question.
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VERY COOL! Love this sort of pic! Makes you think differently about things and potential a diagnostics tools.
Kris
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Its the camera. Strings actually act nothing like that at all ,. Its almost 100 percent camera distortion. Look at the bow limbs. They look the same , bent and distorted. There is a tremendous amount of movement at the shot when the bow hits brace and Kirk Lavender has some awesome movie pics of that. The movement is not a wild ossilation like that though but mostly back and forth depending on limb recovery and stability.
There is none of what that camera is showing during the shot though.
God bless, Steve
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X2
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great to watch