The (new) Crosman Forum, your first and last place for all things Crosman



YOUR GUN PIC HERE



The New Year means its time for new gun pics.
Got something cool?
Something Classic?
Something werid?
Send it and we’ll use it up top
 Return to Index  

Transonic Drag

August 20 2012 at 10:13 AM
rsterne  (Login rsterne)
from IP address 66.244.241.34

I found an interesting graph on Transonic Drag that I thought was worth sharing with you....

[IMG][linked image][/img]

Note that the drag starts to rapidly increase between Mach 0.80-0.85 (900-950 fps) and has doubled by Mach 0.9 (1000 fps) and tripled by Mach 0.95 (1050 fps).... This means that the extra energy it takes to get a pellet above 950 fps will quickly be shed in the first few yards anyway.... That ties in exactly with the work I have been doing on how the Ballistics Coefficient changes as you push the velocity close to the speed of sound....

Since 950 fps gives you an energy of 2 FPE per grain of pellet weight (an easy number to remember).... this is just one more reason not to push the velocity past that....

Bob

 
 Respond to this message   
Responses

Crosman Corporation 1-800-724-7486

This forum is not affiliated with the Crosman Corporation in any way// Information presented in this forum is intended for informational purposes only; use at your own risk//Posts made to this forum are solely the opinion of the individual member