Is it the sound of the powder exploding then the bullet breaking the sound barrier? Is one of them the projectile itself impacting/exploding?
For clarity, I mean it like [this](https://youtu.be/FVQvH4qc5cg?t=22). What is the first, sharper sound, and what is the secind, softer sound?
In: Physics
The sharper, more chaotic, and more violent sounds are the rounds impacting the target.
The mechanical and consistent “brrrrt” sound is the actual sound of the weapon firing.
You hear them as separate events because the bullets are traveling much faster than the speed of sound.
Of note, you get similar effects from rotary weapons on [other aircraft;](https://www.youtube.com/watch?v=xjYz_pY7-Ms) it’s not unique to the A-10 and the GAU-8. The A-10 is just more widely known and more recognizable because the GAU-8 is larger and louder, and is almost exclusively used for ground attack, particularly across the Gulf, Afghanistan, and Iraq wars where a lot of this footage originates from.
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