Could
someone tell me how to work out swept volume please.
Thanks Cameron.

I think that would be the total displacement of the cylinder.

PI times the radius Squared times the height

the height would be the distance from the front of the piston with the gun cocked to the front of the piston where it stops when fired.

this is just off the top of my head but I think that is what you mean.

Thanks for your reply,
excuse my ignorance what is PI and how do you get it.

pi = 3.14159265

Am I doing this right for say a RWS52 = 61.5 CM

PI x 28 x 28 x 100= 24650085

how do I get to 61,5 CM

Here are the calculations. Pi 3.1416 X radius 1.4 cm X 1.4 cm X stroke 10 cm = 61.575. You were using the Diameter instead of the Radius and you were using millimeters instead of centimeters.

swept volume is the length at which you polish your dick.