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Sling Speed???????????????????? (Read 37836 times)
Et Cetera
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Re: Sling Speed????????????????????
Reply #45 - Feb 9th, 2010 at 4:01pm
 
Lets all write to them! The more the merrier.
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Re: Sling Speed????????????????????
Reply #46 - Feb 9th, 2010 at 10:29pm
 
My initial reaction was to suggest, "Nah, they wouldn't be interested." But then perhaps they would! However they like to "Bust Myths" ie. investigate some controversy or other. What better controversy than whether a slinger could in fact take out a skilled warrior with a shot to the head? In other words a dispassionate secular look at the DvG controversy. That subject often gets people hot under the collar even on this site where we generally know about a sling's capabilities. It's been done before but usually by religiously motivated groups who like to put their own spin on it which may not be generally acceptable.
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Re: Sling Speed????????????????????
Reply #47 - Feb 10th, 2010 at 7:32am
 
Also do they televise everything they do? It'd be interesting even if they didn't televise it but still tried it, and shared the results.
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Re: Sling Speed????????????????????
Reply #48 - Aug 5th, 2020 at 9:37pm
 
Playing cards are moving well, maybe it's time to dust off the slinging gear...
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"The nation that separates it's scholars from it's warriors, will have it's thinking done by cowards and it's fighting done by fools." - Thucydides
 
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Re: Sling Speed????????????????????
Reply #49 - Aug 5th, 2020 at 11:43pm
 
Holy moly! This is the first thread I ever posted to!

Mitch, what are the units on that thing? is that 20.4 or 204?

If you do get some confirmed speeds, please post them in the "Chronographs" thread in "Here be Maths" as well. It would be much appreciated since we are trying to track them there.
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Re: Sling Speed????????????????????
Reply #50 - Aug 6th, 2020 at 4:32am
 
204fps (139mph). Sling speeds can get considerably more 'out of hand'.
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« Last Edit: Aug 6th, 2020 at 12:21pm by MitchInTheGlatrix »  

"The nation that separates it's scholars from it's warriors, will have it's thinking done by cowards and it's fighting done by fools." - Thucydides
 
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Re: Sling Speed????????????????????
Reply #51 - Aug 6th, 2020 at 1:54pm
 
Is that tracking the leading edge of a rotating playing card?
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My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none! -Jesus the Noodler
 
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Re: Sling Speed????????????????????
Reply #52 - Aug 6th, 2020 at 2:24pm
 
It works via light sensors exactly one foot apart. You get a LOT of errors unless the card passes level over the sensors. It actually works best when just the advancing or retreating edges catch the sensors. High speed video from a cell phone camera can also be used to verify speeds.

Should try it, it's a real hoot. It's a fun but laborious way to chop vegetables for the stew pot. lol

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"The nation that separates it's scholars from it's warriors, will have it's thinking done by cowards and it's fighting done by fools." - Thucydides
 
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Re: Sling Speed????????????????????
Reply #53 - Aug 6th, 2020 at 9:37pm
 
Love to see your numbers with the sling
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Re: Sling Speed????????????????????
Reply #54 - Oct 1st, 2020 at 1:44am
 
MitchInTheGlatrix wrote on Aug 6th, 2020 at 2:24pm:
It works via light sensors exactly one foot apart. You get a LOT of errors unless the card passes level over the sensors. It actually works best when just the advancing or retreating edges catch the sensors. High speed video from a cell phone camera can also be used to verify speeds.

Should try it, it's a real hoot. It's a fun but laborious way to chop vegetables for the stew pot. lol


Is that a thrown speed? How are you getting a card to 139mph?
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Re: Sling Speed????????????????????
Reply #55 - Oct 2nd, 2020 at 8:22am
 
If you think about how a playing card moves in the direction of a throw, one edge of the card is moving faster than the other because of the rotation. I expect you would see a lot of variation in speed measurements with a break-beam system because of this. 139mph is not the average speed of the center of mass on the playing card. Its a combination of the card speed and the linear speed of the rotating edge of the card.
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My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none! -Jesus the Noodler
 
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Re: Sling Speed????????????????????
Reply #56 - Oct 2nd, 2020 at 11:55am
 
The card would have to be as big as the distance between the sensors for that to be picked up.  Since it uses sensor separated much by several card lengths, any spin would be averaged out to some degree. If it were a radar gun and just picking up all of the doppler shifts that occur from reflected waves, then maybe it would see the spinning as increased (and decrease) velocity, though I doubt the cross-section is big enough for the card edges for this to happen.
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Re: Sling Speed????????????????????
Reply #57 - Oct 2nd, 2020 at 12:08pm
 
Not quite.    A chrony works on the assumption that the shape and geometry of the thing it is measuring don't change, and that's not true with a playing card.  Try throwing a circular playing card and see if that gives the same speed reading.
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My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none! -Jesus the Noodler
 
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Re: Sling Speed????????????????????
Reply #58 - Oct 2nd, 2020 at 1:51pm
 
I believe your reasoning is incorrect, but without a chronometer to test, I can't know for sure. If I had a chronometer, I'd certainly run this test to make sure I understood its limitations.
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Re: Sling Speed????????????????????
Reply #59 - Oct 2nd, 2020 at 2:50pm
 
the card length difference length-width is 2.5cm if the sensor gap is 30cm then the error will be +/-8.3%

the card was going super fast for a card or the error was bigger . those sensors seem to get a lot of errors but if there were many such readings then yes it was super fast
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