300BlkTalk

I read where 1,400-1,800 fps can be trans-sonic. To me it is either super-sonic or it is not. The speed of sound at sea level at 60 degrees F is "something like" 1,100 fps. What gives with trans-sonic?

I would need to see it in context, but on face value it's wrong.

Trans-sonic is basically between 950-1350 fps and is the absolutely the worst velocity for bullet flight that you can choose. The turbulence created going into through the sound barrier is what ripped the wings off early jets and required a completely different wing design. Bullets are no different.

Most distance shooters want their bullets on target above 1400 fps if possible, Precision Air gunners try to stay below 950. Palma shooters know they will be shooting through that window and most companies make a dedicated Palma class bullet designed specifically for that turbulence.

The sound of a bullet in flight varies with shape and things like a cannalure or pressure groove. Grooves make noise and can create their own sonic wave. Different nose shapes also have different pitches.

In the transonic speed range the object (airplane, bullet, whatever) traveling through the air is still going less than the speed of sound, however, there is localized airflow around the object (due to its shape) that is exceeding the speed of sound relative to that object.

Transonic sounds like supersonic.

Suputin221 wrote: ↑Thu May 26, 2022 8:55 pm Transonic sounds like supersonic.

Not really.