angle of attack vs. yaw of repose

[solst_ice]

Can someone explain me the difference in those terms in simple words?

 

[diverdon]

Angle of attack changes when the tail goes up or down. Yaw changes when the tail goes left or right.

 

[solst_ice]

Ah, that simple? Thanks a lot!

 

[Bender]

Bullets do not nose-over on decent from the apex of the trajectory.

 

[tna9001]

Bullets do not nose-over on decent from the apex of the trajectory.

That's true in a vacuum, but most of don't shoot in a vacuum.

 

[Bender]

That's true in a vacuum, but most of don't shoot in a vacuum.

Hmmm, I was under the assumption that they did the same at atmosphere pressures.

 

[tna9001]

Hmmm, I was under the assumption that they did the same at atmospheric pressures.

Both are true, kind of. The gyroscopic stability of the bullet is trying to keep the bullet in the same orientation as it was when it left the barrel but, the aerodynamic force of the relative wind is trying to get the bullet to "point" into the wind. Theoretically, you could spin a bullet fast enough that the gyroscopic stability would overcome the aerodynamic force but you'd run into material limits on the structure of the bullet and there would be a bunch of drag generated.

There's been a bunch written about Spindrift and coning theory that touches on this subject but it gets complicated quick if your not a math whiz.

 

[Bender]

Both are true, kind of. The gyroscopic stability of the bullet is trying to keep the bullet in the same orientation as it was when it left the barrel but, the aerodynamic force of the relative wind is trying to get the bullet to "point" into the wind. Theoretically, you could spin a bullet fast enough that the gyroscopic stability would overcome the aerodynamic force but you'd run into material limits on the structure of the bullet and there would be a bunch of drag generated.

There's been a bunch written about Spindrift and coning theory that touches on this subject but it gets complicated quick if your not a math whiz.

Yeah, I’ve been attempting to read it. It is fascinating.