- Registriert
- 27 Aug 2004
- Beiträge
- 3.715
Transonic Ballistics Effects Explained by Bryan Litzhttps://www.facebook.com/AppliedBal...at-the-transonic-zone-is-a-/1289895284405685/
Some shooters believe that the Transonic Zone is a Wall. That the bullet just completely goes haywire and is no longer reliable once it reaches this "wall". This is incorrect.
What happens when the bullet slows to transonic speed, i.e. when the bullet slows to about 1340 feet per second? It is getting close to the speed of sound, close to the sound barrier. That is a bad place to fly for anything. In particular, for bullets that are spin-stabilized, what the sound barrier does to a bullet (as it flies near Mach 1) is that it has a de-stabilizing effect. The center of pressure moves forward, and the over-turning moment on the bullet gets greater. You must then ask: “Is your bullet going to have enough gyroscopic stability to overcome the increasing dynamic instability that’s experienced at transonic speed?”
Some bullets do this better than others. Typically bullets that are shorter and have shallow boat-tail angles will track better through the transonic range. On the contrary, bullets that are longer… can experience a greater range of pitching and yawing in the transonic range that will depress their ballistic coefficients at that speed to greater or lesser extents depending on the exact conditions of the day. That makes it very hard to predict your trajectory for bullets like that through that speed range.
When you look at transonic effects on stability, you’re looking at reasons to maybe have a super-fast twist rate to stabilize your bullets, because you’re actually getting better performance — you’re getting less drag and more BC from your bullets if they are spinning with a more rigid axis through the transonic flight range because they’ll be experiencing less pitching and yawing in their flight.
Wenn wir schon bei dem Thema sind? Wieviele Leute haben hier schon ein Mal ihre Waffe bis zum Transonicbereich geschossen?
Zuletzt bearbeitet: