Jeff Siewert

You have diameter and then you have velocity squared, okay?

So let's talk about the transverse moment of inertia first, okay?

So transverse moment of inertia is the resistance of the bullet to being oscillated in an axis perpendicular to the longitudinal of the bullet.

So if you thought about let's take a barbell and we'll hang it from the ceiling with a wire spring and you displace that barbell and initially we'll have the weights all the way at the end of the bars.

And so if you displace it and let it oscillate, that thing takes a long time to oscillate.

So that's a situation where you have what we would call a high or a large transverse moment.

If you took the same weight, the same barbell, and you take those weights, and instead of having them on the end of the barbell,

You smash them right close to one another, right near where the spring is.

Now that thing is going to oscillate much more rapidly.

So now you have a globe.

transverse moment.

Okay.

You have low resistance to being accelerated.

Okay.

So that's what the transverse moment of inertia is about.

The CML for the pitching moment coefficient derivative.

Okay.

In any spin stabilized bullet, there's a center of gravity.

That's where the bullet balances if you put it on a knife end.

And then there's a