AEG UN 6.03 Technical Information download pdf (Page 58)

Practical A.E.G Upgrade 2006

Longer spring versus shorter spring: the longer the better?

What are the major parameters of a spring?

Is a harder spring more harmful for the internals?

There has been a myth around saying that a very long spring is needed for

delivering higher FPS. No, that is not always true. As an example, a PDI 130%

spring is about an inch longer than the 140% one.

On every compression spring there are several parameters. The “free length” is

the length of a spring with no load applied. “Length before set” can be thought

of as near the maximum compressed length of a spring (let’s refer to this as the

compressed length). The number of coils also plays a role in determining the

strength of a spring. Generally speaking, the more coils a spring has the more

powerful it is. However, the material that is used for producing the spring and

the corresponding heat treatment process are even more critical. Put it this way,

a soft spring with 10 coils may well be “weaker” than a hard spring with 5 coils.

Also, not all coils are active (this apply especially to variable-pitch springs). And,

installation-wise, a spring that is too long (a high free-length parameter) is

much harder to fit into the mechbox.

To demonstrate the use of a short spring, let’s refer to the example below:

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 156 157

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AEG UN 6.03 Technical Information Page 58