Fps inconsistency

AirSniper said:
Springs wear out, you know your car uses many springs and over time and repeated use through compression and release cycles, they break or loose their ability to provide the required resistance or force.

Same for any spring, some springs are made better than others and some are not and in airsoft, don't expect the best quality. Remember where they are made and the type of steel that is used isn't the same as home grown steel.

In Airguns you expect something that lasts the lifetime of the rifle but even then, they can fail, my sons HW57, a springer .177 had a failure of the spring because the rifle dieseled and caused the spring to become over stressed and it turned a sub 12 fpe in to a sub 8 fpe rifle.

Springs do fatigue and lose their elasticity / tension strength and if you have an ETU that applies precocking to the piston, your spring is under pressure waiting for that release to relax. I had this problem in my RIF where I had the precocking set but didn't let the tension go and what happened was the ratchet and spring went, I had to have a new spring and piston.
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Really? I never knew that, he wrote ironically.

Did you not read my statement "...assuming that the spring strength remains constant."?

Did you not realise that my comment was made in the context of this thread in order to demonstrate that, except where there is premature engagement, motor speed does not affect the power output?

Look, I get that you are an utter twat; why don't you do this forum a favour and fuck off to reddit or FB, where your inaccurate teching advice would fit in really well?

 
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Colin Allen said:
The power spring in an airsoft gun is a mechanism for storing energy.  When the spring is released, that energy is expended in overcoming whatever is preventing the spring returning to its pre-compressed length, which can be friction in the guide rails or between the piston head O ring and the cylinder, or air resistance.  Provided that the spring is always compressed to the same length, the energy stored will always be the same, regardless of how that compression is achieved, assuming that the spring strength remains constant..
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Facts.

Better springs hold their strength for longer (like the nice Japanese steel ones that @ak2m4 is selling now under his XT brand - plug, plug) and yes, springs can lose their oomph over time especially if they're held in compression, but it really isn't noticeable over a day.

Shamal said:
I guess that if you put a crank handle on the gears and manually wound the mainspring back until it realeased then the piston would push the BB out at same FPS but with no volts being involved. So that would prove that the battery state is not directly responsible for FPS.?
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Yep. Physics, innit.

AirSniper said:
I had this problem in my RIF where I had the precocking set but didn't let the tension go and what happened was the ratchet and spring went, I had to have a new spring and piston.
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So...you operated a machine incorrectly and it broke. Sound about right?

 
Springs are easily the most overlooked part of a gearbox build—as others have stated, a proper spring will retain its power for years of use.

For example: Arcturus, Krytac, and even some G&G stock springs.

Or: PDI, Guarder, and Prometheus aftermarket springs.

These springs will also be better in terms of FPS consistency. A well-built AEG can achieve ~0.5 FPS variance with a quality spring.

This is what it should look like:

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Not all builds will be as consistent as this, but if your build is losing FPS even over the course of a day something is wrong with your compression system. Whether that be a faulty seal or grease in the wrong place.

 
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