[quote author=hunterseeker5 link=topic=6271.msg122756#msg122756 date=1374603934]

VERY interesting. A formula eh? Let me try and concoct one, because a few quick number runs shows that one doesn't work.





*edit*

Okay so a seat of the pants formula which will get you in the ballpark is this:



ROF=(X*V)/(TPA*ratio)



This is based on the assumption that the motor has neodymium magnets, unlimited power is available (powerful lipo, negligible voltage drop), and implicitly then that spring rating will not significantly affect ROF. It also assumes a rather efficiently built gun.



V= battery's nominal voltage (assumed peak charge)

TPA= the number of winds on an armature of your neodymium magnet motor. If you don't know the TPA of your motor, you can use ~14 for high speed, 16 for ACM "torque" motors, and ~22 for slow really high torque motors.

Ratio= your ACTUAL (not nominal, count yourself and remember it includes the pinion) gear ratio

ROF= Rate Of Fire

X= the constant 809.5135 (because I like them, so you and your sigfigs can go play with someone else) For a somewhat less efficient gun, or a lame buffer tube battery, or anything else like that, this constant can be reduced. Users in those cases may find 675 to be a more accurate value for X.

Try that on for size, what do people think?



*edit2*

Ran this formula by a couple people, seems to work reasonably well. Also credit where its due (you know who you are) for naming my X value "HS5's constant."

Click to expand...