Author Topic: A New Method for Increasing the Efficiency of a PCP - the SSG (Read 376234 times))

musquat · « **Reply #400 on:** January 18, 2016, 04:22:10 AM »

My main reason for trying this method is that I want to use it when I convert my old 1400 to a retained air pumper. If that rifle had a guide rod out the back, I would certainly get pinched more than I want to think about. My son has a hard enough time making a good shot without that to worry about.

musquat · « **Reply #401 on:** January 18, 2016, 04:24:29 AM »

I am truly sorry for dumping posts into this thread, but I'm sure someone out there will want to see the pics. If I have committed a faux pas, please forgive me.

musquat · « **Reply #402 on:** January 18, 2016, 04:33:30 AM »

OK, here are the pics.

I removed the pic of my rifle, since it seemed to be taking this incredibly important thread off topic. I thank all who replied for your help and if anyone has any further suggestions feel free to pm me :-)

Brandon

gabi.nechita · « **Reply #403 on:** January 18, 2016, 05:12:52 AM »

This is exactly I was looking for my Sumatra. You made my life easier.

bnowlin · « **Reply #404 on:** January 18, 2016, 09:09:35 AM »

Your post numbers are not increasing, pm Dez to fix it.
Bob

moorepower · « **Reply #405 on:** January 18, 2016, 01:02:00 PM »

It is actually 2 nipples and a coupler.

Gerard · « **Reply #406 on:** January 18, 2016, 01:19:08 PM »

Do you have any solid numbers on pressure ratings for those fittings? For my part the reaction to seeing that picture was akin to watching a horror film scene, the binary moment of panic coupled with relief that it is on a screen, not near me. Of course if the fittings are rated for a working pressure of 3,000psi then good for you, no likelihood of a hand being torn apart soon. If they're simple brass plumbing fittings... guy, de-pressurize that thing NOW!

rsterne · « **Reply #407 on:** January 18, 2016, 01:34:00 PM »

Looks scary to me, too.... Unless you KNOW it's safe, please degass that gun NOW!!!!

Bob

moorepower · « **Reply #408 on:** January 18, 2016, 02:16:23 PM »

You can buy safe hydraulic fittings that would easily handle the psi, but those don't look like them. The eight hanging on the elbow puts alot of stress on it.

musquat · « **Reply #409 on:** January 18, 2016, 02:42:34 PM »

You guys are probably right. I don't know about the safety ratings of the brass I used. I will immediately find another way to pressurize it. Thank you guys for looking out for me!

Brandon

Gerard · « **Reply #410 on:** January 18, 2016, 02:51:24 PM »

Since the back end of the tank seems to be secured to the grip frame, and the result makes for a handy forearm on the carbine, perhaps you could preserve the setup by switching to a microbore fill hose running from the bottle to the soldered Foster nipple on the valve? Secure the front of the bottle somehow to make it stable for holding and you've dealt with the risk. A good hose will easily handle more pressure than a failed regulator could dump into it. Something like this perhaps:
http://www.bestfittings.co.uk/shopexd.asp?id=160&bc=no
Of course this would leave a big loop... but perhaps someone like BestFittings or some other supplier could make you a reverse coupling to connect to the right length of hose to run straight back into your valve, given the right measurements.

musquat · « **Reply #411 on:** January 18, 2016, 03:51:52 PM »

Thanks guys, I degass after every shooting session, so It's already done. I promise not to gas it up again until I decide on one of the tried and true methods found on these pages. Thanks again!

Brandon

PakProtector · « **Reply #412 on:** January 18, 2016, 06:34:39 PM »

The increase in velocity as it comes off reg is the typical behavior of hammer stroke that is on the front end of the string( on the increase in velocity as pressure drops).
cheers,
Douglas

oldpro · « **Reply #413 on:** January 18, 2016, 10:54:16 PM »

Ok having great results with very little tuning efforts so im going down this road with SSG for production. Its all internal and completely adjustable externally both rod gap and pre-load plus no rod will come out. I will fine tune this tomorrow and post but for now heres what I got. http://airgunguild.com/index.php/topic,11.msg341.html#msg341 Bob would you still consider this and SSG???

mobilemail · « **Reply #414 on:** January 18, 2016, 11:16:39 PM »

Quote from: oldpro on January 18, 2016, 10:54:16 PM

Ok having great results with very little tuning efforts so im going down this road with SSG for production. Its all internal and completely adjustable externally both rod gap and pre-load plus no rod will come out. I will fine tune this tomorrow and post but for now heres what I got. http://airgunguild.com/index.php/topic,11.msg341.html#msg341

Daaaaannnngggg that's tight! Good job! I imagine if it were tuned to the low 800s the shot count would go up a bit more.

oldpro · « **Reply #415 on:** January 18, 2016, 11:23:48 PM »

Actually it would go way up!!! I just want to take a minute to thank Bob Sterne for talking to me on the phone and answering emails etc. and getting my mind thinking in new ways, this little device will save people with no tuning skills tons of time and me tons of time explaing on the phone how to tune a gun. This last SSG will be tested in the FLEX now.

rsterne · « **Reply #416 on:** January 18, 2016, 11:24:08 PM »

I think some people think I am crazy for making my ideas public and not trying to profit from them.... but this thread makes me proud.... The SSG idea has really taken off, with a bunch of different versions being made in a very short period of time, some of which will make it to commercial production, and more power to them.... Who knows, some of the major manufacturers may even pick up on the idea to give their customers a higher shot count from the air saved.... IMO, when a good idea is given freely to the public domain for everyone to experiment with, improve on, and talk about, it can grow exponentially, almost taking on a life of its own.... I couldn't be happier.... My sincere thanks to EVERYONE who participated in (past, present and future tense) the development of the SSG....

Bob

Sfttailrdr46 · « **Reply #417 on:** January 18, 2016, 11:24:23 PM »

Quote from: oldpro on January 18, 2016, 10:54:16 PM

Ok having great results with very little tuning efforts so im going down this road with SSG for production. Its all internal and completely adjustable externally both rod gap and pre-load plus no rod will come out. I will fine tune this tomorrow and post but for now heres what I got. http://airgunguild.com/index.php/topic,11.msg341.html#msg341 Bob would you still consider this and SSG???

PM me the order info I assume this will be compatible with your NBH I just ordered

oldpro · « **Reply #418 on:** January 18, 2016, 11:28:38 PM »

It certainly will and testing with the SSG with NBH is happening tomorrow!! I have to order enough springs and retainers to make a production run but thats no big deal. Its on like Donkey Kong!!! Im telling you this thing is SO easy to tune it makes me almost obsolete.

Gerard · « **Reply #419 on:** January 18, 2016, 11:39:43 PM »

Far from thinking you're even remotely crazy Bob, I admire the efforts you've made in developing refinements to PCP airguns and the probably even greater amount of time and brain power you've devoted to sharing these innovations, while remaining very open to discussion and improvement. A wonderful example for us all. Amazing what nuts and bolts can accomplish, eh?

I developed the first version of an adjustable and removable neck mechanism for doublebasses about 5 years ago, took it to an international convention in San Francisco and showed it to anyone, entered it into the ISB competition... and so far not one single maker has even bothered to contact me about developing the idea further, nor asking for permission to use it (not that I'm asking for that!). I'm a bit stunned. Of course I'm hardly a household name internationally, but in my region I am 'the guy' bassists come to and recommend to their colleagues. The nut and bolt device I invented makes it easy to dismantle and reassemble a doublebass neck for travel within a few minutes, potentially saving a touring bassist many thousands of dollars per year in over-size airline fees. Of course there are lots of other luthiers and companies making removable necks... but mine is the only design which includes geometry to allow raising and lowering of the strings within a few seconds without affecting tuning, such that large changes in string height can be made on stage between numbers without delaying performances. The added palette of performance options becomes astounding to anyone who understands doublebass performance. But no, every single model continues to involve wholesale retuning after adjustment, delaying performances by half a minute at least, often much longer, so performers really don't bother doing so.

Of course this is in the rarefied world of concertizing doublebass players. I wasn't expecting any big drama. Still, it'd be nice to see a good idea take flight and become adopted generally, especially to see it evolve in the hands of different makers. But sharing the design on my website and in the major discussion forum for bassists hasn't even made a ripple. Oddly, the most interest I've seen is from a few local symphony players, with a couple of them suggesting I should patent the idea and market it. Not interested. Information wants to be free. Thanks for sharing that ethos Bob, you're one of the good guys.

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A New Method for Increasing the Efficiency of a PCP - the SSG

Author Topic: A New Method for Increasing the Efficiency of a PCP - the SSG (Read 376234 times))