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PaperclipPerfector  2d ago (text post)   1788 thread views

Small-Scale Question Sunday for April 19, 2026

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

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1.5x the energy

Recoil is based solely on momentum, not energy; energy is not conserved in explosions. m(bullet) * v(bullet) = m(rifle) * v(rifle).

Accounting for similar impulse (since the bullet spends about the same amount of time in the barrel for each of these), here's what we see:

7.62x39 out of a Draco is 124 grains * 1700 FPS, and a Draco weighs about 7 pounds (or 49000 grains), so if you let the rifle freely recoil it'd hit you at 4.3 FPS. Oh yeah, and that's after the action's done cycling; the peak impulse is only going to be about 6/7ths of that because there's about a pound of mass that takes a while to hit the back of the assembly.

Compare to-spec .357 Magnum out of a typical pistol, which is 158 grains * 1400 FPS, and the gun weighs about 3 pounds (or 21000 grains), so if you let the handgun freely recoil it'd hit you at 10.5 FPS.

This is why Dracos are manageable one-handed from a pistol; but the fact you're holding 7 pounds out in front of you makes them kind of unwieldly.

TIL, thanks

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