Mainspring data thread

[TonyL]

As promied, the measurements from a recent SFS HW95K
SFS spring HW 95K

30 active coils
3.46mm wire
3.95mm gaps
19.75mm o/d
13mm I/d
223mm free length
16mm preload gave 790fps with 8.4gn .177 JSB

Cheers

John

Excellent info, John.

[maximus]

This is the spec of the spring in my new .22 cal HW50s from DB Shietsport Holland.

wire diameter 3,15

active coils, 28

inside diameter 14,25mm

free length 248mm

gap between coils, 6mm.

Both ends are finished rather than cropped and it pushed hobbies out at 695 fps from the box. Now it bits for a spring crop and the fitting
of a guide and top hat!