Mainspring data thread

[Snooper601]

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

[Phil Russell]

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 890fps with 8.4gn .177 JSB

Cheers

John

Thank you for this information. I note, however, that you would be running a tad hot if your figures are correct. Have you recorded the requirements for 'not hot' version?

Cheers, Phil

[Snooper601]

Thank you for this information. I note, however, that you would be running a tad hot if your figures are correct. Have you recorded the requirements for 'not hot' version?

Cheers, Phil

Typo fixed 790fps

J

[Phil Russell]

Hi J
Thanks for the correction. I have added the info to my small database.
From your dimensions, your SFS spring seems a bit heavier, but shorter, than some others.:

WEIHRAUCH HW95 19.6 13.6 3 245 31 Cobham
WEIHRAUCH HW95 19.8 13.6 3.1 270 Versandhaus

I hope the above is self explanatory. the Cobham and Versandhaus terms are where I found my information.


And to the post regarding Titans 13, 14, 15 .... my info only goes up to No. 12 so I would like to know as well if they do more.

Cheers, Phil

[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!