Can you hear the blast

Forums General Discussion Can you hear the blast

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    Dartagnan
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    I’ve always wondered why my Wildcat, with an LDC, is much quieter when shooting in the middle of a field when I was just shooting next a building and I thought was loud. Even with the barrel facing 90 degrees away from the building, the blast seem to echo off the wall behind me and make it sound loud. Has anyone else noticed that?

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    Gunnertrones
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    Yes, this goes for every airgun I have had so far, and I think it is the same all over..
    But a following up question is (if I may use your thread Dartagnan):  Shooting inside the house through an open window,,,,,, –  How does the significant increased blast inside the room appear for someone standing outside?     Would a person outside actually experience a more “silent” blast if the muzzle was put out of the window?
    Anyone tested this?

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    Erik
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    Interesting idea

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    18.13
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    Snipers have used this to their advantage for many years. Get back about 10 ft. from the open window and open other doors and windows. When the blast goes off the sound goes in different directions.

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    Dartagnan
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    “Gunnertrones”But a following up question is (if I may use your thread Dartagnan):  

    
Mi thread es us thread :)

    I think Tominco’s video is a good representation of how the blast echo off the back wall.  
    .

    I did a short video placing my phone in the shrubs and recording how JSB 25.39gr pellets sound at a squirrels perspective. Thank goodness I didn’t shoot my phone but I did sling the pellets about 3′ from my phone and impact a target about 35yds behind the camera. It does give you idea how the pellet sound like at that distance.  Of course the closer it is to the front of the barrel the blast will be more pronounced. The squirrel at the end of the video didn’t even flinch when the pellet flew right by em. 
    .

     

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    snakengrass
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    “Dartagnan”I’ve always wondered why my Wildcat, with an LDC, is much quieter when shooting in the middle of a field when I was just shooting next a building and I thought was loud. Even with the barrel facing 90 degrees away from the building, the blast seem to echo off the wall behind me and make it sound loud. Has anyone else noticed that?

    
What you are referring to, isn’t really volume. It’s sound pressure. The reason it sounds louder inside vs the middle of the field is because there is more space to absorb and dissipate the pressure caused by the firing. 

    Instead of air, think about water to visualize. if you took a golf ball and dropped it into a coffee cup of water from 12″ above, it would splash everywhere and make a mess, and you wouldn’t see any “ripples”. If you took that same golf ball and dropped it into a calm lake from 12″, it would make much less of a disruption because the waves that are created have the ability to lessen over distance (you would see the ripples). 

    Back to air, in a confined space, just like the water – sound creates waves, the higher the frequency (pitch) of the sound, means that there are more cycles (measured in hertz). If there isn’t enough space for the length of the wave (based on the frequency), it causes the “perceived” loudness. 

    Golf ball in coffee cup = shooting in a confined space (boom)
    Golf ball in lake = shooting in a field (tick)

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    Gunnertrones
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    Snakengrass:  “Golf ball in coffee cup = shooting in a confined space (boom)
                             Golf ball in lake = shooting in a field (tick)”

    And this gives sense to the theory 18.13 mention in his post.   
    “Get back about 10 ft. from the open window and open other doors and windows. When the blast goes off the sound goes in different directions”.

    Good answers!

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    peterdulux
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    So much for mouse fart quiet.

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    Dartagnan
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    PLEASE take extra precaution when shooting through windows and doors. Especially when you have the possibility of people or pets unexpectedly stepping into your line of fire. 

    Inform your family. Put out barriers if need be. Secure your pets. Or relocate to a safer shooting position like upstairs through your daughters window and send that picture to any boyfriends she may have. 

    snakengrass:  Thank you for that information.  It paints a clearer picture :)

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    sharroff
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    Dartagnan,

    You forgot “Make sure the window is open before shooting” :)

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    zebra
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    “snakengrass”

    “Dartagnan”I’ve always wondered why my Wildcat, with an LDC, is much quieter when shooting in the middle of a field when I was just shooting next a building and I thought was loud. Even with the barrel facing 90 degrees away from the building, the blast seem to echo off the wall behind me and make it sound loud. Has anyone else noticed that?

    
What you are referring to, isn’t really volume. It’s sound pressure. The reason it sounds louder inside vs the middle of the field is because there is more space to absorb and dissipate the pressure caused by the firing. 

    Instead of air, think about water to visualize. if you took a golf ball and dropped it into a coffee cup of water from 12″ above, it would splash everywhere and make a mess, and you wouldn’t see any “ripples”. If you took that same golf ball and dropped it into a calm lake from 12″, it would make much less of a disruption because the waves that are created have the ability to lessen over distance (you would see the ripples). 

    Back to air, in a confined space, just like the water – sound creates waves, the higher the frequency (pitch) of the sound, means that there are more cycles (measured in hertz). If there isn’t enough space for the length of the wave (based on the frequency), it causes the “perceived” loudness. 

    Golf ball in coffee cup = shooting in a confined space (boom)
    Golf ball in lake = shooting in a field (tick)


    How come a shroud or LDC makes it quieter then? You are adding a small confined space instead of allowing the air to escape into a large open one.

    I assumed that, when shooting inside (or from inside to out), it sounded louder to me because the room acted like a large ldc, except that I was stood inside that LDC. I assumed that it would appear quieter to people who were outside because some of the report was absorbed by the room.

    Not saying you are wrong btw. It’s just confusing to me so I’m asking how it differs.

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    snakengrass
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    Not a bad question, and in reality it doesn’t differ. the room does act (to an extent) like a large suppressor – that’s why it’s loud in the room and not outside. If you were a miniature person nestled in a barrel suppressor, it would be very loud. The designs vary in suppressors but generally speaking they “decelerate” the moving air through a series of baffles that allows the air to cool and relieves the pressure greatly by the time it exits. 

    There are a bunch of legitimate sites that explain how they work, so I’ll spare the copy and paste here. 

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    zebra
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    “snakengrass”Not a bad question, and in reality it doesn’t differ. the room does act (to an extent) like a large suppressor – that’s why it’s loud in the room and not outside. If you were a miniature person nestled in a barrel suppressor, it would be very loud. The designs vary in suppressors but generally speaking they “decelerate” the moving air through a series of baffles that allows the air to cool and relieves the pressure greatly by the time it exits. 

    There are a bunch of legitimate sites that explain how they work, so I’ll spare the copy and paste here. 

    
It should mean that, when it sounds louder to you inside, the sound should be lower for people outside. 

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    X27
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    You can test this sound phenomenon.  Next time your in your car roll all the windows down and turn your radio on, turn the volume up to a medium to loud level. Listen for a bit, now leaving the radio on roll up all the windows. The volume intensifys and appears to have gotten much louder. This is because you have trapped in the sound waves… Just like SnakenGrass has explained. 

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