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

[oldpro]

Thats 100% a fact

[oldpro]

http://airgunguild.com/index.php/topic,11.30.html Ready for the Marauder Rifle platforms now.

[aceflier]

I'll ne ordering one of those before I order the mrod!

[match]

Description: .25 marauder stock reworked valve with SSG .187 barrel port
Notes 1: 2800-1800psi
Notes 2:
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 25.40
Temp: N/A °F
BP: N/A inHg
#          FPS  FT-LBS      PF
23    895      45.19    22.73
22    889      44.58    22.58
21    891      44.78    22.63
20    890      44.68    22.61
19    916      47.33    23.27
18    891      44.78    22.63
17    906      46.30    23.01
16    908      46.51    23.06
15    908      46.51    23.06
14    912      46.92    23.16
13    912      46.92    23.16
12    903      46.00    22.94
11    903      46.00    22.94
10    910      46.71    23.11
9    895      45.19    22.73
8    912      46.92    23.16
7    898      45.49    22.81
6    887      44.38    22.53
5    909      46.61    23.09
4    888      44.48    22.56
3    883      43.98    22.43
2    900      45.69    22.86
1    903      46.00    22.94
Average: 900.4 FPS
SD: 9.8 FPS
Min: 883 FPS
Max: 916 FPS
Spread: 33 FPS
Shot/sec: 0.1
True MV: 900 FPS
Group Size (in): 0.00


Sent from my iPhone

It may be the deleted shots skewing the numbers but this looks a bit strange...

you have a 1% stddev and 3% spread but the numbers are all over the place within the string.

Is there an explanation for this?

Are others seeing this with their SSG's?

[oldpro]

 I certainly wouldnt say its all over the place but the 5 deleted shots would smooth it out a lot. My new light kit will be here friday so I will be able to get strings again without drop outs.

[match]

They are tight 1% stddev and 3% spread - but a "classic" string does not tend to jump up and down the whole spread within the group.

This almost looks like a regulated string with a wider than normal (for regulated) spread...
I thought regulated spreads tended to have a 1% spread or so...

So the SSG is SIMULATING a regulator?

[oldpro]

Description: war valve and SSG.25
Notes 1:
Notes 2:
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 25.40
Temp: N/A °F
BP: N/A inHg
#          FPS  FT-LBS      PF
27    880      43.68    22.35
26    883      43.98    22.43
25    889      44.58    22.58
24    892      44.88    22.66
23    897      45.39    22.78
22    900      45.69    22.86
21    905      46.20    22.99
20    909      46.61    23.09
19    908      46.51    23.06
18    912      46.92    23.16
17    914      47.12    23.22
16    919      47.64    23.34
15    924      48.16    23.47
14    921      47.85    23.39
13    920      47.74    23.37
12    925      48.27    23.50
11    926      48.37    23.52
10    914      47.12    23.22
9    913      47.02    23.19
8    911      46.82    23.14
7    886      44.28    22.50
6    897      45.39    22.78
5    893      44.98    22.68
4    888      44.48    22.56
3    895      45.19    22.73
2    889      44.58    22.58
1    899      45.59    22.83
Average: 904.0 FPS
SD: 14.0 FPS
Min: 880 FPS
Max: 926 FPS
Spread: 46 FPS
Shot/sec: 0.1
True MV: 904 FPS
Group Size (in): 0.00


Sent from my iPhone

[oldpro]

 Last string before crono light problem reared its ugly head. Its more the product of the valve being pushed to far or over dwelled. I need to open the seat area of the stock valve to mellow out the curve and dwell the valve less.

[match]

so that was probably an artifact of the chrono light issue.

[oldpro]

 Part missing numbers and over dwell of stock valve. I only opened up the transfer port. Seat needs opened up.

[aceflier]

Guess I'm confused. Is the hammer spring still used or is the hammer spring on the ssg? Wondering before I order a 10lb hammer spring.

[oldpro]

 It uses its own spring not a marauder type spring. And its all internal no rod comes out the back

[I_like_Irons]

Ready for the Marauder Rifle platforms now.

What I don't completely understand is why you faced off the back of the end cap.  If you have a good mill set-up the set-screw hole could be counterbored and tapped just as easily.  (Conceal it on the bottom if practical.)   If one needs a bigger opening or the ability to put the adjustment screw in from the back end, the end cap could be bored on a lathe just as easily as facing.  Plus, it would have a better finished look to it as you wouldn't have as much of a fresh machined surface thus preserving more of the original anondized aluminum.

I like the fact that nothing protrudes beyond the end cap.  It means that the thing can be put into an Armada that has enclosed stock. 

If these are pictures of the final product and not experimental things whipped up on the spur of the moment, you should consider getting better tooling and working on surface finish.  As a machinist, I'd be ashamed of anything that went to a customer looking like this.   For experimental stuff, however,  it looks just fine. 

[oldpro]

 I milled off the back so you can change springs without taking gun apart!!! Nice right!  I would have them anodized but with such small numbers it would be real expensive. Thats the prototype ive been playing with the customer version will be much nicer. Ill make up a new one tomorrow. They will come with 2 springs for low to mid and mid to high power tunes.

[match]

What are the differences between the MRod and PRod versions? dia only?

[I_like_Irons]

oldpro,

Thanks for alleviating my  finish concerns.   However, if you were to bore out the back end, couldn't one replace springs anyway.  You just need clearance for a socket wrench (perhaps a deep socket) and a screw driver.  You might consider providing tools to make adjustments or swap springs. 

I think something like a deep socket with a t-handle or spanner holes or slots, and a screw driver would allow one to do any assembly or repairs. 

The reason I am saying this is those that have guns, more often than not, want to see new things as pristine as possible.   The more your products look that way will go a lot toward sales.   Also, tools that come with the thing are also seen as an asset.

[oldpro]

spring tensions and length etc. Much the same in how they work.

[oldpro]

  Ill try that tomorrow It sounds like a doable idea. Infact sounds like a real good idea.

[I_like_Irons]

Good.

BTW, that is the thing I tend to be good at---finding the mistakes or improvements that others overlook. 


Now finding my own mistakes on the other hand . . . .

[oldpro]

Nope wont work. You cant hold rod and turn spring preload nut no matter how you try i knew there was a reason i did it my way LOL. Ill look for another way though. where theres a will theres a way right.