Author Topic: XS60C PCP Repeater project (Read 455848 times))

drewciferpike · « **Reply #1600 on:** August 25, 2016, 11:50:56 AM »

When in doubt, kick it out.

I vote for starting over.

Quote from: MDStroup on August 25, 2016, 11:37:41 AM

Quote from: StevenG on August 25, 2016, 08:45:43 AM
Since Stalwart is now doing Disco Doubles, I bet he could do a lot for a Maximus as well.

I bet he could. But I have been just having so many problems with my Maximus. I had to send the first one back because it had so many defects. This one is very inaccurate. 5 inch groups at 10 yards. At this point I don't know if I should just see if I can try to get it to be more accurate with a fluff and buff or just return it and forget the whole thing.

StevenG · « **Reply #1601 on:** August 25, 2016, 01:29:17 PM »

5" at 10 yards is not a group, that is not even a pattern!

You did make sure that the pellets are the right caliber, right?

nervoustrigger · « **Reply #1602 on:** August 25, 2016, 03:23:26 PM »

Quote from: stalwart on May 27, 2016, 07:05:36 AM

Not to worry about me... many of the things I built (over 40 yrs) started out as "impossible", and I find some joy and satisfaction out of coming as close as possible to the impossible. If I don't get there, at least I'll know why.

Eric, I was just catching up on this thread and this comment from you reminded me of one of my favorite quotes credited to Edison:

Keep pushing the limits, brother. Much respect.

stalwart · « **Reply #1603 on:** August 25, 2016, 06:07:05 PM »

The respect, sir, is mutual. Thank you.

Another Edison quote, that has been on one of the dry erase boards for nearly a decade:

stalwart · « **Reply #1604 on:** August 25, 2016, 06:08:50 PM »

I have to add: Success or failure, tenacity has it's own rewards.

MDStroup · « **Reply #1605 on:** August 25, 2016, 07:19:48 PM »

Quote from: drewciferpike on August 25, 2016, 11:50:56 AM

When in doubt, kick it out.

I vote for starting over.

Quote from: MDStroup on August 25, 2016, 11:37:41 AM
Quote from: StevenG on August 25, 2016, 08:45:43 AM
Since Stalwart is now doing Disco Doubles, I bet he could do a lot for a Maximus as well.

I bet he could. But I have been just having so many problems with my Maximus. I had to send the first one back because it had so many defects. This one is very inaccurate. 5 inch groups at 10 yards. At this point I don't know if I should just see if I can try to get it to be more accurate with a fluff and buff or just return it and forget the whole thing.

That is what i am leaning towards. But what i actually meant in that post was walk away from airguns as a whole for a while.

drewciferpike · « **Reply #1606 on:** August 25, 2016, 08:03:33 PM »

Ah. Noted.

You could do that, but then you'd be leaving on a low note, and if you ever started again, you'd have that sour taste until you find something you like.

I recommend a middle path: Shoot some guns owned by others, that are dialed in and a joy to shoot. Take a break. Then come back and buy one of those guns. Then you're happy.

It took me three years to save for a used S510, because I only allow myself a strict "fun" allowance. Sometimes the slow route is nice...

Quote from: MDStroup on August 25, 2016, 07:19:48 PM

Quote from: drewciferpike on August 25, 2016, 11:50:56 AM
When in doubt, kick it out.

I vote for starting over.

Quote from: MDStroup on August 25, 2016, 11:37:41 AM
Quote from: StevenG on August 25, 2016, 08:45:43 AM
Since Stalwart is now doing Disco Doubles, I bet he could do a lot for a Maximus as well.

I bet he could. But I have been just having so many problems with my Maximus. I had to send the first one back because it had so many defects. This one is very inaccurate. 5 inch groups at 10 yards. At this point I don't know if I should just see if I can try to get it to be more accurate with a fluff and buff or just return it and forget the whole thing.

That is what i am leaning towards. But what i actually meant in that post was walk away from airguns as a whole for a while.

stalwart · « **Reply #1607 on:** August 25, 2016, 08:13:56 PM »

Amen.

RMM · « **Reply #1608 on:** August 26, 2016, 10:20:16 AM »

I also keep in mind, It won't be wine until it's time. Patience compliments tenacity.

stalwart · « **Reply #1609 on:** August 27, 2016, 12:31:23 PM »

Quote from: RMM on August 26, 2016, 10:20:16 AM

I also keep in mind, It won't be wine until it's time. Patience compliments tenacity.

Indeed, it does.

Your BBE is one of 3 customer rifles here that are growing better as the time taken is allowing me to incorporate the latest features/methods into them. Your .25 is another.

The point, where the design is as advanced as possible and production methods are as efficient as I can make them... is coming soon. Fast turnaround is the goal now, and all who benefit from that will owe you, and the other daring early clients, for funding it. The last factor inhibiting this is having to teach Andy... and, he is showing that he will be the greatest factor allowing it... given a little time. A good example is the powder coating... Small parts are a real PITA, and my batch size was always limited by my limited ability to stand for a long time. He just pulled off a nice run, and actually enjoys the process. Now, I can throw a bunch of stuff in the tumblers, and walk away... I'm just LOVING that!

stalwart · « **Reply #1610 on:** August 28, 2016, 08:05:13 PM »

The same parts, after hardening... in very bright sun.

This is Cerakote's "Graphite Black", and pictures don't do it justice.

RMM · « **Reply #1611 on:** August 29, 2016, 09:10:38 AM »

Quote from: stalwart on August 28, 2016, 08:05:13 PM

The same parts, after hardening... in very bright sun.

This is Cerakote's "Graphite Black", and pictures don't do it justice.

NICE!! Glad I got the same color! I bought an HF airbrush compressor and had an airbrush so I'm more than ready to paint. Gotta git that garage project done and the grass has gotta quit growin before I can play BB gun again. Winter is comin soon.

I also add I'm honored to be in collaboration with a fine group of gentlemen.

RMM · « **Reply #1612 on:** August 29, 2016, 09:26:49 AM »

It's crunch time and I've been asked what size port I would like and I wish not to make a wrong decision. What we have to work with is a regulator set at 1650psi (it is adjustable) using a 2900psi fill, ,22 JSB Jumbo Beast 33.956 gr (this approx weight to be used exclusively) and an LW barrel approximately 23.8" in length. 17.7 twist rate with 12 grooves.

So here's the question I pose; "What port size and or shape is required to get to the sweet spot when tuned?"

stalwart · « **Reply #1613 on:** August 29, 2016, 11:12:55 AM »

I have to ask: Given the same areas, does a slot allow the air to turn corners easier than a round port? A NACA duct shape? We have a lot of room to play.

rsterne · « **Reply #1614 on:** August 29, 2016, 12:54:39 PM »

I'll be interested in seeing what sort of velocity you can get with a 34 gr. in .22 cal at 1650 psi.... I plan on building a regulated Disco Double around that very idea over the winter.... I was hoping that 2000 psi in the 135 cc upper tube would be enough to hit 950 fps with bore-sized porting throughout with a 25" TJ's 0.217" barrel.... For sure you will want all the ports to match the bore area.... For the barrel port, that means an oblong port that is 0.165" wide by about 0.265" long at the boreline.... I would have the back of the port at 90* to the bore, and the front angled forward with the top rounded slightly into the chamber....

My understanding of NACA ducts is that they are designed to bleed off boundary layer air to the inside of a structure with minimum drag penalty on the outside.... I can't see that application in airgun ports, and if so, the design would likely require a CFD program....

Bob

stalwart · « **Reply #1615 on:** August 29, 2016, 01:50:34 PM »

Thank you, Bob. Will do.

I brought up NACAs just to illustrate a complex shape... but, still have to wonder what that shape (just the outline) might do to direct air.... as well as a few others. Should I set up to do the design and analysis, for a couple percent improvement? LOL... nah.

I'm waiting on delivery of a USB borescope. Hopefully, I'll be able to show everyone the results... from the inside.

Kailua · « **Reply #1616 on:** August 29, 2016, 03:42:05 PM »

I think Bob has it right again. IIRC the bigger the throat radius the better the flow of air is. The air flow tends to hug the throat when air is redirected. JMO

RMM · « **Reply #1617 on:** August 30, 2016, 12:21:23 AM »

Thanks Bob, I'll get this information to the master machinist who is building my rifle.

Now it looks like some valve porting to match the barrel port area is in the very near future.

StevenG · « **Reply #1618 on:** September 21, 2016, 01:33:59 PM »

I just got two of these back from Stalwart. Put one together to prove to myself I still remembered how, and the other tonight will get some pictures. That will take some playing, this stuff is so black it is going to be hard to photograph properly.
Short list of mods;
New tubes, made of 1018 instead of mystery metal. Threads fit perfectly. The old tube fit ok, and was in all likelihood perfectly safe at 1500psi.
Streamlined endcaps with what I think are ninja fittings, or a darn good fitting anyway
Teflon coated striker and bolt
Cerakote all parts except for barrels, which I never sent him and am seriously considering for the future. The barrels do not look good next to all this pretty graphite cerakote.
Trigger mod, not sure what kind of witchcraft is involved exactly, but I bet it requires animal sacrifice or something like that.

I have just test fired it a few times and these changes seem to have cured the galling issues I had before.

I did not however install the safety yet, which I intend to have functional. I also need to get a shorter stiffer spring, as I bet I have plenty of hammer bounce. That or I will let it waste air as a reason to make me exercise more.

stalwart · « **Reply #1619 on:** September 21, 2016, 02:17:58 PM »

Yup, they're Ninjas.

Quote from: StevenG on September 21, 2016, 01:33:59 PM

Trigger mod, not sure what kind of witchcraft is involved exactly, but I bet it requires animal sacrifice or something like that.

I can neither confirm nor deny, but... it would explain all the BBQs?

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XS60C PCP Repeater project

Author Topic: XS60C PCP Repeater project (Read 455848 times))