An interesting bore stroke question...

[maximus]

I'm not sure 30ft lbs is a good idea in a springer. I would of thought early 20's is as far as is comfortable?

[crowbar]

The answer must be a Diana 460!

[TonyL]

Yeah, Walther LGV & century.. the later is a full 30mm, the former the same gun sleeved down to 25.

Add a longer piston rod for 6Fp with the sleeve and you have 6 Fp covered. Job done.

More like 20 FP max though, but that's just a stroke issue. Build the gun with a longer cylinder, and longer stroke in the 30mm version becomes easy.

I'm not sure 30ft lbs is a good idea in a springer. I would of thought early 20's is as far as is comfortable?

And I would be thinking in exactly the same direction as the above.

And fully agree with the maximum power expectations if a nice, usable firing cycle is desired.


Or just go, say, 26mm with three different length latch rods (and maybe 17/18 ft.lbs)?

[TonyL]

Having said that, and taking into account WonkyDonky's "Taming the HW80 my way" thread, maybe an updated HW80 with piston bearing would do us nicely, with the stroke from just over 50mm upwards. And 20+ ft.lbs easily achievable with the longer stroke. Wouldn't take much work, either......

[look no hands]

Having said that, and taking into account WonkyDonky's "Taming the HW80 my way" thread, maybe an updated HW80 with piston bearing would do us nicely, with the stroke from just over 50mm upwards. And 20+ ft.lbs easily achievable with the longer stroke. Wouldn't take much work, either......

Very true but I thought that when this was discussed a while back, we all wanted a light to medium weight rifle (something to better the 99 in theory), so a sleeved down HW80 size gun would limit the market as well.

Like what's already been mentioned and what Bigtoe once said, all it needs is a different length piston rod and that's a lot of the problems solved, for not a lot of money either (about an extra 50p worth bit of metal according to Tony) and everything else (apart from the spring and a top hat may be) can stay the same, thus reducing costs even more and all the person on the assembly line has to do is choose between three different pistons to what ever power model they are assembling at the time, all the manufacturer has to do then is to make the agonising decision whether or not they want to undo all their fine engineering work by adding fishtail checkering to the stock

Pete

[RobF]

If it's such a good idea then why isn't it being done. After all it's a competitive market, why not get one over on your competitor?

[thisisdonald]

It could easily be done if the design was similar to the AR upper and lower receiver

[RobF]

It could easily be done if the design was similar to the AR upper and lower receiver

So why isn't it done?