Hello All,

Attached via the links is the form for submitting results, and a way to access the results as they currently stand.

Submit Results Here!
https://docs.google.com/forms/d/e/1FAIpQLSfH7aKd7YyHN6R55MAhaF-x0dtwcOBNM0HMvzyT
YWIl5A0iNg/viewform?usp=sf_link

Access Results Here!
https://docs.google.com/spreadsheets/d/1SA9v0WGYd4ppDte8GXRtFTluwcKb8vNyJNEegpx0
HCE/edit?usp=sharing

I'd appreciate if you'd attach your results for each throwing session to this thread, and to make that easier, I happen to have a really simple form to fill in that has all the details you'll need for up to 80 throws. That's a lot of throwing.

The reasons for attaching your scanned or photographed results here, is that the study only asks for fastest, slowest, and average throw from your results. Your more detailed results will allow us to create a more detailed picture of the gathered aggregate data, and then we can periodically drop that off in the Data Publication Thread for your enjoyment.

Thank you for all your help!

That's awesome!

I added my data to the spreadsheet. It seems the only other entry is in mph, whereas the spreadsheet specifies "m/s".

Here is the video from the data in the spreadsheet, this was almost full power, from 16 yards.

https://www.youtube.com/watch?v=RQ3bAICVD8M

add newtons or ft/lbs of energy to your data i've heard that with lead bullets slingers can get up to 9mm power or around 350 ft/lbs of energy which would require a 2.89891304339 pound projectile at 36.8 m/s or 120.7349 ft/s and then the other guy would have to sling a 1.90500035379 lb object at 183.727 ft,s or 56 m/s and a nat geo article "The Roman slingers would have exacted a heavy toll. Recent experiments conducted in Germany showed that a 50-gram Roman bullet hurled by a trained slinger has only slightly less stopping power than a .44 magnum cartridge fired from a handgun" https://www.nationalgeographic.com/news/2017/05/ancient-slingshot-lethal-44-magn... which would require the slinger to get speeds of a center fire riffle something isn't adding up here either we realy suck at slinging are using the wrong projectiles or people have drasticly over estimated the power of a sling

Have you looked at the numbers for momentum?
I haven’t checked your maths but it’s pretty achievable to hit 30-70m/s and projectile weights 50grams.
I think 52m/s and a 200g projectile was recorded by Luis

I wish that NatGeo article cited some sources. You'd think we'd be aware of such studies, being experienced slingers they would call upon. Does Mr Jeagor know anything about this?

Arrows kill by cutting and blood loss.  Bullets do the same thing but also add the shock of the impact. 

A stone thrown by hand can have enough impact velocity to rupture organs and break bones, a sling just increases the velocity to cause more damage.

I don't think you can really compare a crushing projectile with a cutting projectile.

I have some data to share from today's session. Measurements of velocity were made with a PocketRadar, throwing away from it. I was using a 72cm sling (from inside of pouch to center of fingers when in retention loop, i.e. the radius)

Tennis ball: 57.6 g
Throw 1: 110 mph (49.17 m/s)
Throw 2: 107 mph (47.83 m/s)
Throw 3: 112 mph (50.07 m/s)
Throw 4: 115 mph (51.41 m/s)
Throw 5: 116 mph (51.86 m/s)

Rusty balls: 160.2 g, 159.8 g
Throw 1: 104 mph (46.49 m/s)
Throw 2: 100 mph (44.70 m/s)
Throw 3: 101 mph (45.15 m/s)
Throw 4: 101 mph (45.15 m/s)

The error is about 1 mph (~0.5 m/s). (according to a comparison with a high end radar gun)