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Speed measurements (Read 203 times)
IronGoober
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Speed measurements
Sep 28th, 2020 at 11:32pm
 
Move this post if needed to "Here be Maths."

https://youtu.be/LHXB931PNcE

My best is 106mph with a 160g projectile. I doubt I can do much more. Maybe 1 or 2 mph faster with this sling, as my best yesterday was 104, today 106.
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John R.
 
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Sarosh
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Re: Speed measurements
Reply #1 - Sep 29th, 2020 at 5:24am
 
I think we have similar output and you might be better. 106mph 160g would be 180m-200m,  it puts into perspective those early records, 200g 350m.
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joe_meadmaker
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Re: Speed measurements
Reply #2 - Sep 29th, 2020 at 9:58am
 
Despite your taunting in the credits, I had to watch until the end. Smiley

Do you think you could get a higher speed with a rock (or something else with a solid shape) that weighs 160g?  I'm curious if the un-solid nature of a rusty ball causes a less efficient transfer of energy.
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IronGoober
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Re: Speed measurements
Reply #3 - Sep 29th, 2020 at 10:10am
 
Sarosh wrote on Sep 29th, 2020 at 5:24am:
I think we have similar output and you might be better. 106mph 160g would be 180m-200m,  it puts into perspective those early records, 200g 350m.

Yeah, I totally agree with the last bit, but I think you have me beat on speed, esp. with tennis balls. But yes, Melvin Gaylor or Larry bray's records...How? They must have tendons like steel cable.


joe_meadmaker wrote on Sep 29th, 2020 at 9:58am:
Despite your taunting in the credits, I had to watch until the end. Smiley

Do you think you could get a higher speed with a rock (or something else with a solid shape) that weighs 160g?  I'm curious if the un-solid nature of a rusty ball causes a less efficient transfer of energy.


Hehe. I thought about leaving some reloading footage in, to make it go longer, but I like the way I did it in the end.

I wonder about that too. From Sarosh's videos on speed measurement, He did see differences between a tennis ball and a similarly weighted stone. So, yeah, there may be a small amount lost during acceleration due to extra drag from more cross-sectional area. I was using my usual target sling, but I want to try the same with a less "drag-y" sling as well.
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« Last Edit: Oct 11th, 2020 at 10:40pm by IronGoober »  

John R.
 
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Shakli
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Re: Speed measurements
Reply #4 - Oct 11th, 2020 at 3:33am
 
Ok so I watched you over and over at 0.25 speed.  Take my input here with a grain of salt as I have yet to do this my self but here goes: 
The good:  You are using your hip and shoulder well to get your power, which is why you are able to throw so fast.
The bad:  You are not using your back at all. The truck of your body is moving as one block instead of spiraling though your back.  I am guessing that if the order of the throw is hip, stomach, scapula, shoulder, elbow, wrist,  you will get the max amount of power from your body.

Again take this with a grain of salt, since I cant actually do what I am talking about.  I will be working on it though.  Will let you know in 2-3 months if I succeed and if my assumption is correct. 

Edit:  Thank you so much for this clip it really helps figure out technique.
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IronGoober
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Re: Speed measurements
Reply #5 - Oct 11th, 2020 at 10:44pm
 
Shakli wrote on Oct 11th, 2020 at 3:33am:
Ok so I watched you over and over at 0.25 speed.  Take my input here with a grain of salt as I have yet to do this my self but here goes: 
The good:  You are using your hip and shoulder well to get your power, which is why you are able to throw so fast.
The bad:  You are not using your back at all. The truck of your body is moving as one block instead of spiraling though your back.  I am guessing that if the order of the throw is hip, stomach, scapula, shoulder, elbow, wrist,  you will get the max amount of power from your body.

Again take this with a grain of salt, since I cant actually do what I am talking about.  I will be working on it though.  Will let you know in 2-3 months if I succeed and if my assumption is correct. 

Edit:  Thank you so much for this clip it really helps figure out technique.


I think you are right, actually. The kinetic train is most efficient if the hips rotate first, then the shoulders/core. If you watch pitching/javelin throwing, this is always the case with world-class athletes. In pitching it is called shoulder-to-hip separation. I have about 0 of that.

It is probably the case for slinging as well, that it would be most powerful/efficient transfer of muscle power into the sling to do it as you suggest.  I just don't know how to reprogram 12 years of my own slinging habits. I wish there were a good way to do it.
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John R.
 
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NooneOfConsequence
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Re: Speed measurements
Reply #6 - Oct 12th, 2020 at 2:36pm
 
For reference, the fastest baseball pitch without a sling was 105.1 mph with a ~150g baseball. 

https://www.guinnessworldrecords.com/world-records/fastest-baseball-pitch-(male)...
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