Master Doug Huffman
Banned
imported post
Yep, a good error is better than a bad question. Thank you for your progressive contribution.
Yep, a good error is better than a bad question. Thank you for your progressive contribution.
This is the picture that I showed here and that I'm referring to in my posts:
(yes its me in the picture, set the tripod up and set it on timer)
So as you can see, there are 3 pieces of brass in the air, and she couldn't fathom my camera being able to take a picture like that. For $1400, it better freaking be able to take a picture like that.
i applaud you for seeing the evidence in such pure terms.The angle makes it tough, but based on that picture and these assumptions:
- you pulled the trigger three timeswithin 1 second
- the farthest piece of brass is about4 feet away
Does4 fps sound too slow?
Several years in engineering school were not a waste. Phew!buster81 wrote:i applaud you for seeing the evidence in such pure terms.The angle makes it tough, but based on that picture and these assumptions:
- you pulled the trigger three timeswithin 1 second
- the farthest piece of brass is about4 feet away
Does4 fps sound too slow?
im thinkin 1/2sec for,,,, bang, bang, bang, click the pic.
so i get 8 fps
the distance of the farthest brass, and the amount of time, are the variables.
Her and I have gone shooting before cause she is my friend's girlfriend. Shooting isn't new to her, she just thinks shells fly at horrendous amounts of speed and that my camera couldn't take a picture of 3 consecutive shells lol. I tried explaining to her that if brass flew at 800fps, anyone who was hit by it could suffer fatal injuries. She stuck with her opinion.
I guess that'd sorta work. Although you'd only be measuring one part of the horizontal component of the velocity. There'd also be the same type of measurement errors. The timing can be done very accurately, and I think it would provide the most accurate solution.That may work but I have an idea for a simpler solution.
Items you will need.
Firearm
Camera that takes video or rapid succession pictures with a know rate (i.e. x number of milliseconds between pictures, or x FPS (frames per second) rate)
an object of known size or create a scale somewhere in the frame. Ever see mythbusters when they show high speed camera footage near that black and white board that is a scale of know distance between the sections of black and sections of white.
Set the scale as close to the ejector port as possible and try to set up the scale bar so it is a close to parallel with the ejecting brass path as possible. Start the camera fire off a few rounds. Then take the distance that the brass travels between frames and multiply that out.
Example if the brass moves 6" between frames and the camera can take a picture 2 times a second then you have brass that ejects at 1 FPS.
This depends primarily on the extractor tension.long story, but for the life of me I can't find any information on this. I want to know how fast does brass eject from a 1911 .45? In FPS...
Send me your gun and I'll set a chrony next to the ejection port.Any one want to do any of these tests for me? You know, since I did write that review for all of you about the Ranger T vs. Golden Sabre hehe.
Dude, just use a chrony.A proposal for finding the approximate speed of ejected brass...
Well, there's a couple problems with that. First of all, I don't own a chrony, so I'd have to borrow one.Alright, i will settle for the ejection specs for YOUR gun Marshaul. Since you have a chrony and all... Just let me know what the make, model, and caliber of your gun is. use a .45 if you can get your hands on one. Thanks!
Indeed. I don't even have one, and here I am suggesting the use of it.lol I couldn't sleep and needed something to do.
Not everybody has a $80 chronograph.
A heavy, low-pressure .45 ACP travels at speeds hardly any faster than 800ft/s. (See wikipedia.)So, since I know that the picture isn't photoshopped, I know that my camera is capable of it. But she is under the impression that brass flies out of guns at 800fps. If that were the case, I don't think my camera could catch 3 brass in the air.