So from what I gather, this is the answer to the question. Can you let me know if you agree with it please?
The first concept is the center of mass. The center of mass is the average location of mass of an object. The center of mass does not have to be within the bounds of the object, as in a...
Thanks for the diagram. I think I might be understanding, but please let me know your thoughts.
As the diagram pertains to bullets, what is very important is something not shown which is ΔΦ, or change in the angle between the direction of torque and the spin axis. In all the diagrams I have...
So that answers one question, but shifts to another. How does spin stabilization or an aerodynamic upwards, overturning torque (pitch-up) cause the spin axis to rotate down (pitch-down) without there being another, opposing torque? (Drag force changes velocity but not rotation, meaning that the...
That was a very helpful video. I do understand precession better.
Regarding this: "And the spin axis doesn't do a simple forward rotation, but precesses around the velocity vector." I think assumes that the velocity vector stays the same? But the velocity vector changes due to gravity...
Haha, I absolutely do not fully understand precession. I appreciate the responses. How does the spin axis reorient in a forward rotation to the incoming airflow without it being called a torque? I think this is key and I do not understand.
While gravity does not apply a torque directly, it is...
If 301 words is not concise enough, or you do not like the complexity then we are at an impasse. I have cited McCoy as you requested. In turn, I am requesting that you cite or clarify this statement "That causes the bullet to walk sideways in flight." Thank you.
The purpose of spin stabilization is to maintain the orientation of the bullet in a way that reduces the drag force.
I was referencing the fact that if the bullet maintained its orientation in space for the entire trajectory, then the orientation of the bullet would actually be detrimental at...
Static stability does not maintain the gyroscope in its orientation in space, but maintains the orientation of the gyroscope in the direction of of the overturning moment. - http://ffden-2.phys.uaf.edu/212fall2001_Web_projects/Isaac Rowland/Ballistics/Bulletflight/stab.htm
I think McCoy...
"Spin stabilization causes the bullet to maintain its axial orientation." This is not true in any reputable source. What references are acceptable to you so I can provide them?
You also posted this on my previous inquiry. Thank you for responding! First, I'm not sure that "R" refers to drag; usually that is Fd (force of drag). I think the arrow is supposed to point sideways, not backwards.
Also, why would a component forces (lift force) be more relevant than net...
I suppose the label "aerodynamic" is misleading, as you are correct, the lift force causes torque in the opposite direction
However, it is spin-stabilization/gyroscopic-precession that redirects the lift force into an aligning force. Without the green arrow, the entire concept of...
1) Bullet spin causes a bullet to become a gyroscope. Specifically, bullets have their center of pressure in front of their center of mass. Therefore, when pressed, gyroscopic forces cause a bullet to spin 90 degrees instead of tumble. See this diagram:
2)The precession does not cause the...
I got it from the the textbooks I read, including McCoy. Brian Litz has a great explanation in his book Applied Ballistics For Long Range Shooting 3rd Edition-Applied Ballsitics LLC (2015), page 95-96:
"A Brief Explanation of Spin Drift
Spin drift is a unique consequence of spin stability. Spin...
I have read McCoy 2012. As far as I can tell, he covers drift on page 198 of Chapter 9: "For a right-hand twist...the bullet's nose points to the right of the flight path, in a small, steady-state yaw of repose.... The yaw of repose has one significant effect on the trajectory; it produces the...