GTA

All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: robertr on April 10, 2019, 03:51:57 PM

Title: Calculating Efficiency ( air tube size )
Post by: robertr on April 10, 2019, 03:51:57 PM

 I was looking for info on the capacity of my Scorpion SE air tube, could not find any good info so I measured it myself.
My tube measured 1,2 cm radius and 30 cm long, id measurements. This gives me 135cc volume of tube if I calculated right, that is Disco size :o
 When you punch in the numbers in Loyd's calculator for Gun Tank volume do you use just the air tube volume or do you also add up the air volume after the air tube, regulator, valve etc?

Title: Re: Calculating Efficiency ( air tube size )
Post by: rsterne on April 10, 2019, 04:55:11 PM

You just use the air tube volume in front of the regulator, unless you are shooting down below the regulator setpoint.... That is because the regulator, plenum and valve volume are held at constant pressure by the regulator....

If you shoot down below the regulator setpoint, you have to do the calculation in two steps.... The first part is done as above, and once the pressure drops below the setpoint, then you have to use the total volume....

Bob

Title: Re: Calculating Efficiency ( air tube size )
Post by: robertr on April 10, 2019, 05:13:04 PM

 Thanks Bob, that is what I will do then.