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Chronograph (Read 1357 times)
Mersa
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Chronograph
Aug 13th, 2018 at 6:27am
 
So as I understand there are none or very little records of chronographs being used to measure sling projectiles with actual slingers.
As a group can we get this done??!!
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Morphy
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Re: Chronograph
Reply #1 - Aug 13th, 2018 at 8:07am
 
I've heard of people using audacity and radar guns. But Chronies would be nice for a good release velocity. Only problem I foresee is the high likelihood of destruction. Maybe cut out some sort of shield for the actual machine?
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Re: Chronograph
Reply #2 - Aug 13th, 2018 at 1:59pm
 
This seems like a great project for the "Here Be Maths" section. And, with pre-weighed projectiles, we can clear up a lot of information on the effects of sling length, performance, and possible ranges of performance.

But I agree with Morphy: Those things are expensive, and would likely get damaged. Plus, their measured area is really small, which requires a precise throw to get it measured.

Some careful engineering and pursuit is at hand here, and I'd be glad to help in any way I can. Just let me know.
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Bill Skinner
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Re: Chronograph
Reply #3 - Aug 13th, 2018 at 7:37pm
 
They aren't really expensive and a shield would be rather easy to build.  You can get an inexpensive one for a lot less than a phone or I pad.

The main problem will be the window, it's actually rather small.  And you will have to have the shades for it to work properly.  So, you would have to throw through a port in the shield for it to work. 

So, we'd need a really super accurate slinger, who can throw at full power and not get squirrely with his accuracy when he does so.

This actually sounds like a job for Timpa.   Grin
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Mersa
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Re: Chronograph
Reply #4 - Aug 14th, 2018 at 2:48am
 
Same idea I had a window to shoot though so we don't go smashing the chronograph  first shot . Maybe I can talk my archery buddies into buying and sharing one.
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Re: Chronograph
Reply #5 - Aug 14th, 2018 at 12:58pm
 
MidwayUSA had an inexpensive model, last time I checked.  And it will record arrows.
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Re: Chronograph
Reply #6 - Aug 16th, 2018 at 12:33am
 
The poor manís version would be two pieces of tissue paper held tight and spaced a known distance apart. Record audio and you can calculate speed from the time between each paper sound as the projectile breaks through the papers. No need for a chrony at all Smiley
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Re: Chronograph
Reply #7 - Aug 16th, 2018 at 6:47am
 
goth dave has a chrono.

Dunno if he's posted any videos of it in use.
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Re: Chronograph
Reply #8 - Aug 16th, 2018 at 7:45am
 
https://youtu.be/BrtBc-9pQv4

Perhaps a set up like this? You could also measure rotational speed while your at it by painting the glande black and white as well. You wouldn't need a super expensive camera at sling speeds.
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Re: Chronograph
Reply #9 - Aug 16th, 2018 at 10:41am
 
@Morphy that's the way i do it. but there might be errors.
wait until weekend. i'm making a video with speed measurements by camera frames.
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Morphy
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Re: Chronograph
Reply #10 - Aug 16th, 2018 at 11:22am
 
Sarosh wrote on Aug 16th, 2018 at 10:41am:
@Morphy that's the way i do it. but there might be errors.
wait until weekend. i'm making a video with speed measurements by camera frames.


What kind of camera are you using?
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Re: Chronograph
Reply #11 - Aug 16th, 2018 at 11:36am
 
720p 30fps the same you see in the videos i've uploaded.
hopefully i will find a phone with more fps in the future.
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Mersa
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Re: Chronograph
Reply #12 - Aug 16th, 2018 at 6:55pm
 
Yeah I've thought about setting up distance markers and using audio or video to analyse it but I really want a chrony so it's there for everyone to see , sling projectiles can go ...... ?? Fps.
I've looked into the price and there around the 200 mark in Australia. Pout of reach for now but maybe possible later this year .
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Re: Chronograph
Reply #13 - Aug 16th, 2018 at 9:03pm
 
I like the board and side camera idea. I'll have to try to set something similar up in future as well. Right now, I just don't have anywhere to do it.

I'm starting a new thread in the "Here Be Maths" section for your speed recordings and using what method. I'll create a similar Google Form to the one I've done for target results and we can compile some decent statistics from that over time.

I'm looking forward to hearing about the results in future!

(Also, when I create my regular slinging club in Northern NY/Southern VT, I'll be regularly uploading such results and I'll have both standard targets and a speed rig like the one described above. I'll let you know when that's established.)
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Re: Chronograph
Reply #14 - Aug 17th, 2018 at 2:31pm
 
I discovered this nice program lately that I used to clock a golf ball from a sling.  https://physlets.org/tracker/ ; I just set a stationary side camera and used the golf ball's diameter itself as the reference distance -- this might not have been the best idea, but it gave me a reasonable number -- about 85 fps I think.
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