Thread 16839584

Greetings gentleman.

I present before thee a simple problem.

Rifleman wants to clamp his rifle unto a slap of concrete to help mitigate recoil and help achieve a tighter group.

Where does he clamp the rifle to achieve this ?

Show your math.

Thank you for playing.

>>16839584 (OP)
I don't know any math so I choose B.
It just feels right and even if it's wrong it will still be better than picking the other extreme.

>>16839584 (OP)
You'd need to give the model of the rifle to get an accurate answer, but i think those three positions wouldn't make much difference because the recoil force is to the right of the picture and not up in air. The size of the concrete block and strength of the fixture would be more important

>>16839584 (OP)
Slap of concrete isn't attached to anything?

If it's just a balance, then you should pick C, since on recoil rifle goes up, making a rotation motion around the stock. In order to mitigate that motion we want to increase mass moment of inertia and put that weight as far from stock as possible. So it will accelerate up slower given the same force.

However it would be uncomfortable to aim with such a weight.

>>16839684
What ? Why ?

>>16839744
No.
Other forums predicted C as the best option as it adds weight as far forward of the pivot point (shoulder) as possible.

It's to be shot prone.

>>16839813
>What ? Why ?
Because you're asking to show math and not providing any details

>>16839584 (OP)
You clamped to the rifle at the same location in all three states. The answer is a bigger slab of concrete.

My initial thought was B but after reading >>16839744 I think he's correct as long as the clamp (and slab) are mostly rigid which might be a better assumption than the clamp being able to pivot like I initially imagined for some reason. If it could freely rotate then I think B would be the best. If the slab was heavy enough then location shouldn't matter but if it was there would be no point to the question.

>>16839584 (OP)
If it's not A the shooter won't be able to control the gun, so recoil mitigation isn't relevant.

>>16839813
>No.
>Other forums predicted C
This is not how you build counter-argument in /sci/.

>>16839584 (OP)

> Where to clamp?

Clamping implies no movement, thus recoil is mitigated on all A,B, C. Thus we prove it does not matter.

Therefore the problem becomes where to clamp to achieve a tighter group.
Suppose the distance of the target is at the exact location such that if the rifle is triggered to fire with no movement and the path of the bullet intersects the center of the target, then B is the correct choice. As this will allow the rifleman to shoot with no adjustments necessary providing a tighter grouping.

Now suppose the target distance is closer to the rifleman than the previously described distance, then A is the correct clamping as this will allow the rifleman to adjust the rifle angle such that they can hit the target without hitting the muzzle of the barrel on the concrete as it would in C.

Now suppose the target distance is greater than the first distance described, then C is the best option as this will allow the rifleman the ability to angle his rifle such that it does not bottom out on the concrete as it would in A.

Thus the distance of the target is the deciding factor of the location of clamping, hence it becomes an issue of the point of aim required to achieve the grouping desired. See image for a rough idea of why distance matters most.