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Speed Measurement with Tennis balls (Read 913 times)
Sarosh
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Speed Measurement with Tennis balls
Apr 20th, 2019 at 3:21pm
 
https://youtu.be/Czg3VgZftco

Mrjugas had similar results ( https://www.youtube.com/watch?v=xJooCQldw0M ) now I wonder if there is a speed limit with tennis balls in the same way there is a max range limit.
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joe_meadmaker
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Re: Speed Measurement with Tennis balls
Reply #1 - Apr 21st, 2019 at 10:29pm
 
Nice video.  I always like your videos.  Your throws look so clean.

In regard to the speed limit of a tennis ball, are you referring to a limit when it leaves the sling?  Or something like a terminal velocity that the ball would reach during its flight path when its deceleration starts to level off?
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Sarosh
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Re: Speed Measurement with Tennis balls
Reply #2 - Apr 22nd, 2019 at 3:48am
 
Thanks man!
I think there is a velocity above which any extra effort is wasted because of steep drag increase.
I 'd like to see someone throw a tennis ball faster than 56m/s or further than 80m.


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Re: Speed Measurement with Tennis balls
Reply #3 - Nov 9th, 2020 at 9:05pm
 
How long do your tennis balls last? Mine crack if I hit anything hard with them. I've made a special backstop just to cushion them and make them last a few days because they're $3 each, and they still crack if you throw high and let them hit the ground.

I even had to use a soft target because if they hit the wooden one I had they would split in one or two shots Sad
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Sarosh
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Re: Speed Measurement with Tennis balls
Reply #4 - Nov 11th, 2020 at 5:29am
 
I havent been using tennis balls for a while. they last long enough usually lose them rather than break them. best tennis balls are those that tennis clubs throw away because they are free I got once a big bag, it lasted for roughly a year.(before losing or breaking)
if they break from a free fall somethings wrong
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NooneOfConsequence
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Re: Speed Measurement with Tennis balls
Reply #5 - Nov 11th, 2020 at 8:50am
 
Nice work Sarosh! 
If you wan to take it to the next level, let's measure the kinetic energy stored in the tennis ball as angular momentum and add that rotational energy to your calculations to see how much energy is transferred from the slinger to the ammo.
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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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NooneOfConsequence
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Re: Speed Measurement with Tennis balls
Reply #6 - Nov 11th, 2020 at 8:53am
 
a wrote on Nov 9th, 2020 at 9:05pm:
How long do your tennis balls last? Mine crack if I hit anything hard with them. I've made a special backstop just to cushion them and make them last a few days because they're $3 each, and they still crack if you throw high and let them hit the ground.

I even had to use a soft target because if they hit the wooden one I had they would split in one or two shots Sad


Sounds like you have some inferior tennis balls.  I don't know what's available in your area, but here in Texas, Walmart sells a pack of 36 pressurized tennis balls for $16... That's about 6x less than what you are paying, and I don't have trouble with them cracking except when my dog eats them.
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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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Sarosh
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Re: Speed Measurement with Tennis balls
Reply #7 - Nov 11th, 2020 at 9:18am
 
NooneOfConsequence wrote on Nov 11th, 2020 at 8:50am:
Nice work Sarosh!
If you wan to take it to the next level, let's measure the kinetic energy stored in the tennis ball as angular momentum and add that rotational energy to your calculations to see how much energy is transferred from the slinger to the ammo.

Thanks!

https://youtu.be/m4tX1kCz-rY?t=240

bottom right 4:01
~6.9Joules
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Re: Speed Measurement with Tennis balls
Reply #8 - Nov 11th, 2020 at 12:39pm
 
NooneOfConsequence wrote on Nov 11th, 2020 at 8:53am:
Sounds like you have some inferior tennis balls.

I'm mid Pacific Ocean everything is expensive and crap quality from China, I got about 40 of them split. Even with soft backdrop and target we split one a day.
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CrazyBrave333
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Re: Speed Measurement with Tennis balls
Reply #9 - Nov 11th, 2020 at 10:59pm
 
Hey has anyone tried solid tennis balls? Like the dog chew toys? They have a range of sizes and are pretty cheap...
Like these https://www.kazoo.com.au/products/puncture-proof-tennis-ball?variant=32174044053...
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Re: Speed Measurement with Tennis balls
Reply #10 - Nov 11th, 2020 at 11:03pm
 
CrazyBrave333 wrote on Nov 11th, 2020 at 10:59pm:
Hey has anyone tried solid tennis balls?

Pressureless tennis balls. They don't have them in my country but they seem better, heavier and won't break. Interested as well in anyone who has used them.

I've been thinking of buying some online, but shipping is expensive and our borders have been closed for 7 months,unsure when they'll open.
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Re: Speed Measurement with Tennis balls
Reply #11 - Nov 12th, 2020 at 11:51pm
 
a wrote on Nov 11th, 2020 at 11:03pm:
CrazyBrave333 wrote on Nov 11th, 2020 at 10:59pm:
Hey has anyone tried solid tennis balls?

Pressureless tennis balls. They don't have them in my country but they seem better, heavier and won't break. Interested as well in anyone who has used them.

I've been thinking of buying some online, but shipping is expensive and our borders have been closed for 7 months,unsure when they'll open.


Have you tried the sand-filled balloons yet? If you can't get balloons, any sort of stretchy plastic could work. Wrap it in a bunch of socks. I haven't tried it, but it could work... You might also try flour instead of sand as suggested by Morphy, if you want to keep the weight down, but size up.

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Re: Speed Measurement with Tennis balls
Reply #12 - Nov 13th, 2020 at 2:14am
 
IronGoober wrote on Nov 12th, 2020 at 11:51pm:
Have you tried the sand-filled balloons yet?

Oh yes, they're excellent. But dangerous for the little kids.
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Re: Speed Measurement with Tennis balls
Reply #13 - Nov 14th, 2020 at 12:38am
 
a wrote on Nov 13th, 2020 at 2:14am:
Oh yes, they're excellent. But dangerous for the little kids.

Try smaller balloons with flower instead of sand and make them 30g instead of 80g+

The flower makes them softer and at 30g they flatten on impact easier making them bearable if hit.
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Tomas
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Re: Speed Measurement with Tennis balls
Reply #14 - Nov 14th, 2020 at 7:00am
 
Tennis balls will break if you just haul off and abuse them.
I like em for wall target practice since you can catch em.
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