Yep, a pretty significant weight reduction indeed, Max. Even more looking at the information as provided by Jim. Thank you, Jim.
As we've always said, it's all down to that question of balance......transfer port size and the choking effect, spring rate, preload, pellet start pressure, piston weight, piston momentum, cross sectional density etc. And will the longer stroke be more efficient, giving that longer power pulse? Short stroke will reduce the first phase of recoil displacement (also dependant on other factors) but, depending on that set-up, could result in harsher piston bounce and higher cylinder temperatures. To a degree I think we all like to sing a different tune and if the result is pleasing, accurate and usable, then it's job done?
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- August 3/4, 2024.........BOING!!
Well, I just need mine to finish up at the "pleasing and accurate result" bit! The good news is that the chronograph seems to of sprung back into life so once the rain stops ill have another bash. Would be interesting to try a tx mk3 spring in it.
Plinkerer and Tinkerer
Great to hear that the chrono is, hopefully, okay.
I can think of many much worse ideas than trying the TX Mk 3 spring.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- August 3/4, 2024.........BOING!!
In an old AGW, I think the article was about short stroking, there is a picture of you Jim, where you have a pock holed 95 piston sitting on a set of scales, I can't remember the weight of this piston off the top of my head, I think it was a lot less the 270g, did you abandon the lightened piston and go for reverse engineering upping the weight or is 270g the standard 95 piston weight ?
ATB
John
Hw77+7
So we still haven’t resolved this.
I had a theory that the 85/95 had an unusually long stroke (81-85mm?) combined with a heavyish piston.
But that doesn’t seem to work. The D34 has 80mm or more depending on the piston/trigger group fitted.
The FWB Sport is 77mm, but with a 304 gm piston.
Maybe the HW hits a particular odd un-sweet spot where the piston is the wrong weight, the 12 ft-lbs spring is too slow, and the stroke at 12 ft-lbs is too long. Whereas the Diana and FWB avoid that through slight but important variations, including the famously heavily pre-loaded spring in the FWB?
My other theory, given my dislike of the 85/95’s handling, is that it’s unusually muzzle light. Except, compared to an FWB, D34, let alone a B55 or a Vulcan, it’s not. Once you get the bloody thing on target, it stays firmly there, until it fires.
It’s a mystery. One for the airgun X-files.
In my case i have a .22 hw95 which was fine out of the box and an hw95 .177.
I got the chance to shoot a .177 at the range.It was superb,the lad told me wonky donky had tuned it.
A while later i contacted WD about tuning my .22 and he spoke of a re-engineered tune like the rifle i tried at the range.The gun shoots brilliantly -a keeper.
For the .177 i decided to try a few thing for myself which i have done,this weeks short stroke piston seal on a lighter hw piston being the latest.
I believe lighter piston,short stroke with a good spring and good fitting guides is the way to tame this jumpy gun with a bit of weight to the silencer too.
Is there a nice slim silencer to put on? Presently have the factory HW unit which does the looks no good at all.
I am lucky enough to have a Jonny Neate muzzle weight (sadly no longer available)on my .22 V-Mached 95. This looks really beautiful, has room for a felt insert which is as effective as the HW mod in reducing muzzle blast and has removed any trace of muzzle flip. If only someone would make something similar!
I am going to go away and shut up,after this, as I am being extremely boring. As usual.
But, after 122 posts and over 3000 views, including from some of the most expert springer people in the world (not me), we still appear to have a consensus that:
- the 95 is indeed boingy;
- we don’t really know why;
- tuning or internal modifications can help (as with any springer....);
- hanging a big lump of metal on the front end helps (see above).
It’s just weird.
I’d expected that one of the many airgun geniuses or gurus would turn up and say “the problem is X, the solution is Y” and we’d all slap our heads in a “why didn’t I think of that?” mode, and then complain to HW saying they should do Y.
Right, bye. Sorry. Best of luck.
I'll need to plough through my old articles and notes to be certain, John, but I do remember first reducing the weight to match the sectional density of my 25mm HW77 (249g, being piston, seal and top hat), then taking it down to 238g.
My conclusion was that, to reduce recoil, reducing piston weight was preferable to reducing piston stroke.
Last edited by BTDT; 21-01-2021 at 06:07 AM.
People who have been there focus on the fundamentals. People who sit at keyboards all day focus on the trivial and inane.