Tuning Air turbulence

[bowdude]

Tore my .22 cal Caiman X down for a good cleaning & checking things over. I found that the transfer port (in the receiver) is threaded. I assume for a restrictor. Question is can the threads in the transfer port cause turbulence that could affect the performance of the gun? Right now it’s tuned for 45-46fpe with Jsb KO’s. 

 

[nervoustrig]

Not to any meaningful extent. Air delivered to the pellet/slug is overwhelmingly turbulent already due to the many turns and transitions it undergoes.

 

[Seth0764]

Well we polish transfer ports to improve efficiency and air flow. so I would imagine the threads are causing some restrictions. I wouldn't want them I my transfer port 

 

[FW-190]

flow is probably choked, meaning shock wave sits in throat of restriction. Thread just reduce size of throat. See fanno flow and rayleigh flow

https://en.wikipedia.org/wiki/Fanno_flow

https://en.wikipedia.org/wiki/Rayleigh_flow