Posted on 10/06/2017 11:30:08 AM PDT by HLPhat
A graphic analysis of two sequential burts of gunfire from:
https://www.youtube.com/watch?v=mBbOFwWquAw&feature=youtu.be&t=1m7s
Research resources:
https://www.google.com/search?biw=1544&bih=856&q=Forensic+Acoustics+gunfire
http://www.physicsclassroom.com/mmedia/waves/er.cfm
https://www.timeanddate.com/weather/usa/las-vegas/historic
http://www.csgnetwork.com/soundspeedcalc.html
FReep / discuss away folks...
Maybe because there was only 1 shooter?
There are videos of the flashes on the fourth floor from 1-2 hours before the shooting started.
My thought on the tax cab driver is that it sounded different from the two different windows.
She was recording directly below one window and 45 degrees from the other window 32 stories up.
When I listened to the initial, unedited audio from multiple civilians (including this taxi driver) I was convinced of two things:
1. It was fully automatic weapons. Not bump stocks. Full auto are smooth and even in cadence, bump stocks are intermittent and uneven. I’ve heard both in the past.
2. There were two weapons. I could hear them firing sometimes at the same time. Each had a different tone...one a sharp crack (.223) and the other a deeper boom (.308 or 7.62 x 39?).
It will take a lot of work and explaining to convince me that what I heard was one man with a bump stock.
I don’t buy it. No sale.
>>There are videos of the flashes on the fourth floor from 1-2 hours before the shooting started.
Not surprising. Looks like a reflection of a billboard or something to me. Or maybe the screen/lighting at the concert.
Good observation.
I think that’s what the evidence show.
Another video just posted here clearly shows strobe light around 4th floor going well before any shooting.
>>1. It was fully automatic weapons. Not bump stocks.
Look at the amplitude graphic of the audio - And the delay between the 1st and subsequent shots observable in the recording.
Would full auto have a delay like that?
because the obvious presence of echoes undermines the necessity for a more complex theory. where did 2nd shooter shoot from, in your theory?
Tell that to the people in the other hotels that had incidents there also.
I can explain why the audio sounds like a belt fed, which I will admit it does because of the cyclic rate but it was multiple bump fired ARs with Surefire 100 round mags. Here is the explanation. What people are reporting about bump fire stocks being erratic and difficult to run is true when they are fired in a normal range type setting. That is when they are fired horizontally to the ground. However when bump firing either with a stock or without is done at an extreme downward angle (which this was) it's actually VERY easy to get very long and steady rate of fire. The reason for this is fairly simple. The trick to bump fire is pulling the weapon forward with an consistent force to keep the weapon bumping the trigger as it returns from recoil. When the weapon is pointed downward gravity does the work so the rifle is actually just bouncing up and down and activating the trigger. This is the reason for the nice 500 RPM cyclic rate and the reason the bursts last about 10 seconds. 8-10 rounds per second empties a 100 hundred round Surefire mag in 10 seconds. Then the pause where the shooter takes a breather moves positions picks up a new rifle equipped the same way and repeats the process. If the shooter actually had a belt fed he likely would have fired bursts lasting much longer than 10 seconds. This was bump fire just as they are saying.
What other incidents? And show me links with physical evidence.
Thank you for pointing this out. The difference in sound from the two positions made it sound like someone was firing two right next to her (the cabbie).
Ah, strike that ‘two’ from my earlier reply.
The firing rate definitely had variations in cadence not found in true full autos. I suspected that a bump fire stock was used as soon as I heard the recoedings.
For about the fourth time, I will post a bunch of youtube links, each cued up to the shooting portion. Yes, bump fire can be erratic for the beginner, but with a little practice you will see how regular, and rapid, bump fire using a Slide Fire Solutions bump fire stock can be.
https://youtu.be/yTSNscULt28?t=206
https://youtu.be/Uo4kFzECXGs?t=49
https://youtu.be/pqxoiAjSrAU?t=50
https://youtu.be/ax5TM6DooQY?t=212
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