Stroke lengths, TP sizes and SCR for various springers...

[brucegill]

OK guys, with all this talk of SCR etc... How about we put a list together of the standard stroke lengths, bore sizes and TP sizes?

I've got ones for a HW 77/97 and a 95 (HW80 + HW35 added) so far.... Would be interested to know them for the 99, 80, 55, TX/Prosport old and new, LGV etc....

I'll need: Model - Bore size (B) - Stroke Length (S) - Transfer Port Diameter x Length (TP) - Piston weight in grams without the liner but with the seal.

Standard rifles
Model	Bore D (mm)	Stroke (mm)	Swept Vol.(cc)	TP D x L (mm)	TP Vol. (cc)	SCR	Piston(g)	Caliber	Notes
HW77/97 early	25	81	39.76	3x6	0.042	938:1	235	-	up to serial number: 1446048 - Some rifles have 2.9, 3 or 3.1mm TP
HW77/97 Late	26	81	43.01	3x6	0.042	1014:1	265	-	From serial number 1446049 - Some rifles have 2.9, 3 or 3.1mm TP
HW95	26	85	45.13	3x15	0.106	426:1	254	-	-
HW80	30	80	56.55	2.9x11	0.073	779:1	-	-	-
HW35 Early	30	65	45.95	4x26	0.327	141:1	-	-	Leather seal (up to serial number 843636)
HW35 Late	30	65	43.83	2.8x26	0.160	274:1	-	-	Synthetic seal (843637 on)
TX200 (MK1+2)	25	84	41.23	3.65x9.8	0.103	403:1	a bit more than 225?	-	Additional Top Hat weight.... not sure of weights. Piston will weigh more due to longer piston rod.
TX200 (MK3)	25	98	48.11	3.65x9.8	0.103	470:1	225	-	.177 add 27g top hat, .22 add 16g for top hat
Webley Vulcan	27	79	45.23	2.5x19	0.093	485:1	-	-	-
Webley Hawke	25	79	38.78	4x16	0.201	193:1	-	-	-
Westlake B2	25.4	80	40.54	4x28	0.352	116:1	-	-	-
HW99S	26	71	37.7	3x17?	0.120	314:1	235 - 225	-	225g piston with seal and no liner. Add 10g if you leave the weight inside the piston.
Modified Rifles below
HW35LGV	25	71	34.85	4x6	0.075	463:1	-	.177	Walther LGV Piston - Conversion by Mick (T 20)
HW77/97 early	25	81	39.76	3.9x6	0.072	555:1	235	-	TP opened up to 3.9 as suggested by Bigtoe01
HW95	26	85	45.13	3.6x15	0.153	296:1	254	-	TP opened up to 3.6 as suggested by Bigtoe01
HW35 Early mod.	30	62	43.83	4x26	0.327	135:1	-	-	Synthetic seal convention (Chambers etc)
model	Bore	stroke	Swept Vol.	TP dims	0.042	scr	Piston Weight	Caliber	notes

[TonyL]

BRILLIANT IDEA BRUCE!

And, you're right, why not extend this to as many different rifles as possible, as a quick reference guide.

Maybe even an excellent idea for a sticky, chaps?

[Dan944]

It's really weird brucy boy as this is exactly what has been going on in my head too the past few nights!

Strange!

I would also love to have a list of this info, to suss a few things out that I've been wanting to experiment with, and generally get my head around.

( why am I never happy to just shoot my bloody guns!)

[brucegill]

BRILLIANT IDEA BRUCE!

And, you're right, why not extend this to as many different rifles as possible, as a quick reference guide.

Maybe even an excellent idea for a sticky, chaps?

thanks matey. Just added the 80..... Might ad the SCR as well.... Now I've got my head around the sums lol

It's really weird brucy boy as this is exactly what has been going on in my head too the past few nights!

Strange!

I would also love to have a list of this info, to suss a few things out that I've been wanting to experiment with, and generally get my head around.

( why am I never happy to just shoot my bloody guns!)

ay up Danny boy there's good reason to tinker matey. The day we're happy with something as it is, is the day I'll get bored and find a new hobby lol.

[Dan944]

thanks matey. Just added the 80..... Might ad the SCR as well.... Now I've got my head around the sums lol



ay up Danny boy there's good reason to tinker matey. The day we're happy with something as it is, is the day I'll get bored and find a new hobby lol.

You know that Bruce!!!

[rich_morris]

BRILLIANT IDEA BRUCE!

And, you're right, why not extend this to as many different rifles as possible, as a quick reference guide.

Maybe even an excellent idea for a sticky, chaps?

Perhaps you could also include things like piston weight, std spring dia., gauge and coils?

[brucegill]

Perhaps you could also include things like piston weight, std spring dia., gauge and coils?

Piston weight would be a nice idea!

look here for spring details:
http://www.airgunbbs.com/showthread....ng-data-thread

If people add the info we need to this thread I'll happily amend the first post so people can find what they need with out trailing through the thread.

[T 20]

Hi Bruce

Some more numbers for you

Wehrauch HW 35 leather seal --------------- transfer port = 4mm ID X 26mm ---- Cylinder = 30mm ID X 65mm stroke

Weihrauch HW35 synthetic seal ------------- transfer port = 2.8mm ID X 26mm -- Cylinder = 30mm ID X 65mm stroke

^^^^^^^^^^^^^^^^^^
These are not carved in stone


Weihrauch HW35 synthetic conversion kit ---- transfer port = 4mm ID X 26mm ---- Cylinder = 30mm X 62mm stroke

Weihrauch HW35LGV ------------------------ transfer port = 4mm ID X 6mm ----- Cylinder = 25mm X 71mm stroke





All the best Mick

[brucegill]

Hi Bruce

Some more numbers for you

Wehrauch HW 35 leather seal --------------- transfer port = 4mm ID X 26mm ---- Cylinder = 30mm ID X 65mm stroke

Weihrauch HW35 synthetic seal ------------- transfer port = 2.8mm ID X 26mm -- Cylinder = 30mm ID X 65mm stroke

^^^^^^^^^^^^^^^^^^
These are not carved in stone


Weihrauch HW35 synthetic conversion kit ---- transfer port = 4mm ID X 26mm ---- Cylinder = 30mm X 62mm stroke

Weihrauch HW35LGV ------------------------ transfer port = 4mm ID X 6mm ----- Cylinder = 25mm X 71mm stroke





All the best Mick

Many thanks Mick! Great to have your modded 35 in there too

Finally worked out how to add tables in HTML so will do the sums for SCR ASAP.

Have amended the threads title so we can include AA, LGV etc.... If we can get this going it'll be a cracking point of reference.

If anyone thinks of another column, let me know now as its a PITA to add later

[brucegill]

One I'm very interested in is the 99s!

Also the LGV, TX etc...

[nat1]

Nice idea,
as well as standard figures listed for each model, do people on here have "optimized" figures for say 11.3ftlb running sweetly that could be added along side or is there no such thing as optimum!!!!!

Atb,Woody.

[brucegill]

Nice idea,
as well standard figures listed for each model, do people on here have "optimized" figures for say 11.3ftlb running sweetly that could be added along side or is there no such thing as optimum!!!!!

Atb,Woody.

Thanks bud. Not sure if there's an optimum for a set power..... Hopefullyone of the guys who understand this more will post

just about to add SCR values.

[brucegill]

Ok, added SCR's for the rifles listed so far......


Can someone check my figures? I'm getting confused! (Have made a spread sheet up so its all automated....)

Looking at the SCR for say the early 77 and the 80, the 80 should shoot nicer than the 77 Or at least it's closer to the preferred 300:1-500:1

I'm guessing Piston weight must be playing a major factor here!

[Snooper601]

Ok, added SCR's for the rifles listed so far......


Can someone check my figures? I'm getting confused! (Have made a spread sheet up so its all automated....)

Looking at the SCR for say the early 77 and the 80, the 80 should shoot nicer than the 77 Or at least it's closer to the preferred 300:1-500:1

I'm guessing Piston weight must be playing a major factor here!

Hi Bruce, its probably worth adding a swept volume column to save calculator punching

The SCR is difficult as the target value depends on port length as the gas flow through the port is restricted more by a longer port, it's an indicator of when it will slam or bounce.

Cheers

John

[bigtoe01]

95/98/new 85 are 85mm stoke, not 86, all depends what seal is fitted obviously

If I get a chance i will boot the old machine up and get my notes off it, however only the stock stuff, not what i set.