Return to Index  

Or you can just flip the forumla around.

June 19 2012 at 9:13 PM

Paul O.  (Login libertyman777)

Response to what speed cannot be exceeded and stay under 20fpe limit with given wt pellets

I have this taped to my workbench.

v = sqrt [(fpe * 450240)/wt]

v = velocity in fps, wt = pellet weight.

Take the highest fpe you want to work with 19.9 or 11.9 (or whatever), multiply that number by the common factor 450240, divide the result by the pellet weight in question and take the square root of that result and Voila!

19.9 x 450240 = 8959776

8959776/10.5 = 853312

And the square root of 853312 = 923.75 fps

Same deal with 12 fpe guns. Figure up the desired fpe for anything, 20, 12, 15, 100, whatever. The variable is projectile weight.

Map to the FT Park>

 Respond to this message   
On line trajectory Plotter by Ray Carter On line trajectory calc by Brad Troyer    MILDOTS    BAR/PSI conversion

This Forum's, moderators and administrators are not responsible for any problems that may occur from reading or using content posted on this forum, as they are the exclusive responsibility of two parties: the person who posted it and the person who acted on said posted information.Use of our forums by people under 18 years old is allowed only with legal guardian(s) present.


When you signed up you agreed to All N54 Rules.    1-No Flaming or name calling.No Personal attacks, racial slurs, foul language or insults and no trolling.     2-Instigating with the purpose of drawing people into highly argumentative situations and wasting of bandwidth is a cause for post deletion and/or banning.    3-Do NOT comment on Forum Moderation. It is what it is, live with it or leave. This is an immediate 30 day ban.    4-If you feel wronged email    - Keep the forum Civil and behave in a socially acceptable manner.