Spring help, non-linear vs non-variable pitch spring

[HeReigns]

Hi all,

I thought all springs were the same but like my assumption about understanding women, I was wrong ;-)

I have a KWA RM4 ERG and apparently they use a non-variable pitch spring. What is the difference between that and a non-linear or irregular pitch spring?

Which companies make a non-variable pitch spring?

Thanks in advance
Cheers,
Chris

[Red Dot]

I was curious about this as I too just picked up a couple of non-linear springs.

After Google search it looks like non-linear springs ease into compression like a bell curve on a graph as opposed to linear springs which has a straight line between resting and compressed states.

You can use either but I think the logic behind non-linear is that they ease the pressures on the gearbox over time so in theory less wear and tear versus linear springs. I dunno how much of that works in the real world but it was an interesting read.

[Wrath144]

I think non-linear is just easier to wrestle into a mechbox.

[Kos-Mos]

The benefit you get in a mechbox with a non-linear spring is on the trigger response and semi-auto rate of fire.
It will also stabilise the FPS.

Because the spring is "softer", the motor works less to get it started. Once the motion and gears are turning, the motor does not struggle with all that plus the spring, so the added tension is not a problem.

Also because the spring becomes noticeably softer near the end of the travel, the air pressure behind the BB stabilizes just before the end of the cycle, and results in more constant and stable FPS. Think of it like moving a bowling ball with a baseball bat vs. easing it forward...