What is the formula for pellet energy at the muzzle of a air rifle using the chrony ?
It doesn't make any difference. Dividing by 45020 is the same as multiplying by 1/45020, and multiplication is commutative."b.1381"The Velocity and Grains, must be calculated before you divide by 45020.
Think of a one pound weigh floating in the air. One foot pound is the energy required to move that one pound weight one foot in distance."danhor7"Earlier this year I was wondering "just what is a foot pound?" Couldn't find the answer anywhere. Of course a foot pound as it relates to torque is easy to grasp. One pound of force applied one foot away from the vertex is one foot pound of torque. But what is a foot pound of energy?
Now figure out how many PSI that is at the point of impact, assuming a .25cal pellet with a flat wadcutter style head pushing 40ft/lbs energy."oil_dripper"
Think of a one pound weigh floating in the air. One foot pound is the energy required to move that one pound weight one foot in distance."danhor7"Earlier this year I was wondering "just what is a foot pound?" Couldn't find the answer anywhere. Of course a foot pound as it relates to torque is easy to grasp. One pound of force applied one foot away from the vertex is one foot pound of torque. But what is a foot pound of energy?
Pressure = Force/Area"ztirffritz"
Now figure out how many PSI that is at the point of impact, assuming a .25cal pellet with a flat wadcutter style head pushing 40ft/lbs energy."oil_dripper"
Think of a one pound weigh floating in the air. One foot pound is the energy required to move that one pound weight one foot in distance."danhor7"Earlier this year I was wondering "just what is a foot pound?" Couldn't find the answer anywhere. Of course a foot pound as it relates to torque is easy to grasp. One pound of force applied one foot away from the vertex is one foot pound of torque. But what is a foot pound of energy?
Very close.oil_dripper
Think of a one pound weigh floating in the air. One foot pound is the energy required to move that one pound weight one foot in distance.
You got it brother."nvelkhunter"Ok, now let's look at Energy
Formula is E = 1/2mv^2 * 1/225217.5
E = Energy (ft lbs)
m = Mass (grains)
v = Velocity (ft/s)
225217.5 is a constant that converts the grains units to lbs and accounts for gravity
Note: ^2 means the value is squared
225217.5 = 1 ft lbs / (7000 gr * 32.163 ft^2/s^2)
7000 gr per lb
Acceleration of gravity 32.163 ft^2/s^2
E = 1/2 m (gr) * v^2 (ft^2/s^2) * 225217.4 (ft lbs) / (ft^2/s^2)
Simplifies to:
E = mv^2 / 450435 (ft lbs)