Video Chronograph of a Coehorn Mortar.

[Littlef]

I'm kinda proud of this one. I've been shooting this little Coehorn mortar that I built for a couple of years. I've always wondered how fast these cans are flying. I set up my slow motion camera to track it and calculate the speed. It actually worked. Mystery solved. I thought it was worth sharing.

https://youtu.be/aURJ3Akpdmw?si=NmfzaRkFwkBsx8_q

 

[guzzi]

Interesting project.

Beautiful video. The sound and image quality is just right.

Looked at you other videos and subscribed.

 

[JeffG]

Good stuff!

 

[Littlef]

Interesting project.

Beautiful video. The sound and image quality is just right.

Looked at you other videos and subscribed.

Thanks a lot, im Glad You enjoyed it. It took about a week and a half To edit it, but I think
It was worth it.

 

[Littlef]

Good stuff!

Thank you sir.

 

[J-Bar]

Thanks a lot, im Glad You enjoyed it. It took about a week and a half To edit it, but I think
It was worth it.

Good videos take some effort. Well done.

 

[Jim Watson]

Just like Mythbusters, and you even showed it in miles per hour like they did.

 

[Littlef]

Just like Mythbusters, and you even showed it in miles per hour like they did.

I'm pretty sure mythbusters was probably the first place I ever saw this technique. That show was great. I don't remember the episode, or what they were even tracking, but since then, I've seen numerous other videos use the technique. It works well as long as its something you can line the camera up to.

 

[Jim Watson]

They used it many times and it is a viable technique, but I got so tired of cannon ball velocity in miles per hour.
I had to recall that 60 mph is 88 fps and make the conversion to units that made sense to me.

 

[Littlef]

They used it many times and it is a viable technique, but I got so tired of cannon ball velocity in miles per hour.
I had to recall that 60 mph is 88 fps and make the conversion to units that made sense to me.

Interesting. I calculated FPS, and then just converted that to MPH. I was only interested in MPH cause I bought a drone, which has a top speed of 36 mph. I'm gonna try to play chase the can, and see if I can keep it in frame.

 

[windini]

Ok, Smartypants, now tell us: What is the airspeed velocity of an unladen swallow?

Great video! Both theory and execution.

 

[alfsauve]

Cool. Curious if a LabRadar or Garmin could detect your mortar?

 

[Littlef]

Ok, Smartypants, now tell us: What is the airspeed velocity of an unladen swallow?

Great video! Both theory and execution.

African or European?

 

[Littlef]

Cool. Curious if a LabRadar or Garmin could detect your mortar?

I have a labradar. I don't think you'd ever line up the beam correctly when firing it into the air. At some point, I think I might build a base for the mortar at the proper angle (42-45 degrees) to pitch up the rear of the base, and level the barrel angle flat, so I could shoot the can parallel to the ground. Then, set up a paper target and try to chronograph it that way. Just for comparison. It's not an immediate project, but something that's been kicking around in the back out of mind.