01-07-2022, 08:09 PM
Klem,
did you mean to say that the center of pressure moves forward, rather than the center of gravity? I would think the center of gravity for an object like a bullet that is a solid shape remains the same. It's my understanding, perhaps wrong, that the further forward of the CG the CP is, the faster you have to spin the bullet to keep the pointy end headed down range first. i.e. short bullets take less spin than long bullets. My understanding is that the spin will still keep the bullet going pointy end first, but as you transition the sound barrier the CP does move which causes a random dispersion to the trajectory which is why the groups open up as the bullet goes from supersonic to subsonic.
please clarify if I have it wrong.
thanks,
-tdbru
did you mean to say that the center of pressure moves forward, rather than the center of gravity? I would think the center of gravity for an object like a bullet that is a solid shape remains the same. It's my understanding, perhaps wrong, that the further forward of the CG the CP is, the faster you have to spin the bullet to keep the pointy end headed down range first. i.e. short bullets take less spin than long bullets. My understanding is that the spin will still keep the bullet going pointy end first, but as you transition the sound barrier the CP does move which causes a random dispersion to the trajectory which is why the groups open up as the bullet goes from supersonic to subsonic.
please clarify if I have it wrong.
thanks,
-tdbru