"For every action, there is an equal and opposite reaction."
That said reaction is force, not quite energy.
-TL
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"For every action, there is an equal and opposite reaction."
(mr)(Vr)=(mb)(Vb)
mr is mass of rifle
Vr is velocity of rifle
mb is mass of bullet
Vb is velocity of bullet
This is incorrect, you must include the weight and velocity of the gas. See the link to the SAAMI document in post #9.
The difference was that in her hand, it banged a nerve and blood vessel against a bone because the grip didn't fit her. In my hand, it recoiled into the meaty pocket between the thumb and forefinger, not against bone. I guess you could say that's power transfer, but grip fit was what made felt recoil intolerable for her and essentially negligible for me. What I was trying to point out is that felt recoil incorporates things like grip fit which recoil calculations don't account for.In your example, the power transfer rate is the difference between you and her.
You are using two different formulas to calculate energy -- one for muzzle energy, and a completely different formula for recoil energy.Tangolima said:Rifle recoil energy
Er=(0.5)(mr)(Vr)^2=(0.5)(mb^2)(Vb^2)/mr
Muzzle energy
Em=(0.5)(mb)(Vb^2)
Start with 3 equations.You are using two different formulas to calculate energy -- one for muzzle energy, and a completely different formula for recoil energy.
I guess that makes sense to you, but it doesn't make any sense to me.
One can also lump the mass of the powder into the bullet mass, assuming the gas exits at the same speed of the bullet.
The powder gases do exit at considerably higher velocity than the bullet and the better online recoil calculators will take that into account although even then there's some "assumptioning" taking place as no one actually measures the gas velocity. Typically the calculators use a "typical" number for gas velocity rather than try to make any attempt at coming up with an actual velocity.
For comparing the recoil of two different loads in the same gun, or the recoil of one load in two different guns, you can usually ignore the contribution from powder gases without skewing things too much because there's not usually a huge difference in powder charge weight and because the bullet is the main contributor.
Quite true. However, while the gunpowder contribution is a large part of the overall recoil in some cartridges (as noted in the article--good article, by the way) when one is comparing loads in one gun (one caliber) or when one is comparing one load in multiple guns (again one caliber) it's usually possible to get away with ignoring the gunpowder contribution without skewing things too much because, in a comparison, the differences are what is of interest, and the gunpowder contribution, while significant in the overall picture will not usually be hugely different in those two somewhat limited circumstances.For some cartridges, the gunpowder makes a HUGE contribution to recoil.