No problem, I'll get these things done sometime today.Now that you have a base line with the 105/499, could you try it with the modified abutment? Then with your spring? That could give a very good suggestion if my current thinking is reasonable or completely “missing the target”.
Also could you screw the 499 shot tube assy into the abutment, then lay it in position next to the 1938b shroud, and post a pic of that. I’d like to see where the barrel shroud would need to be modified. I have some damaged barrel shrouds to modify.
I think small holes would wear the piston less than big holes while still serving the purpose.Idle thought #1
Friction is certainly a thing. I haven’t addressed it mostly because it seems to be the variable that is most consistent. And perhaps the most difficult to affect beyond cleanliness, bore polish, and lubrication. Drilling holes will have some effect. Not really clear on that path yet. There are arguments going on in my head about many small holes vs a few larger holes. And then where to end them before the not drilled area? Any opinions?
I think another important factor is that the bb stays on its seat till the piston clears the holes.
That is likely a factor of the strength of the magnetic field vs letting the displaced air out of the vent holes.
What about honing the first part of the compression chamber (CC) oversize? That could lessen friction to help piston velocity and holes could also be added to vent pressure and/or delay positive air displacement to increase dwell time of the BB on the magnet, however one looks at it.
Here, here! Breathes new life into the project, so thanks Mauser lover!I’m quite excited by these possibilities! Thx again to Mauser lover for this new path of development!
We may never have the type of data that's generated by the instruments used there but eventually we may be able to 'break the code', so to speak.Idle thought #2
I haven’t read the GTA threads yet, but am very interested! Real data would be very useful.
Someone had posted a reference to the 1938 RR of the early 70’s. Its kind of a hybrid machine. I have a very rough one that I plan on modifying significantly. I think it may have the most potential of the lever actions for a very nice repeater with a high mv. Not sure that it would ever be a 400fps shooter but close. If anyone is interested, I will be happy to discuss that project. The perforated air chamber may be called for. That, in my mind, may be a real game changer!
There is also the relationship of a perforated air chamber and the air tube displacing the bb prematurely. A delicate balance to be sure!
The "No. 1938 Red Ryder Carbine" made 1972- '79 is a neat gun for sure. It is close to the original 111-40 w/the exception of lever appearance, narrow rear sight notch, lighter rate spring and higher lever pivot. The lever appearance is a moot point, the sight notch change is a minor improvement, decline or a wash depending on who you ask, the spring being weaker follows the trend of the times. But the easier cocking effort from the change in the lever pivot/ratio is a significant improvement to my way of thinking. Sure, the lever throw is longer but the reduced effort gives a better feel.
Interesting times, folks!