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Author Topic: SSG and results  (Read 11906 times)

Whitney1

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SSG and results
« on: January 10, 2016, 05:30:35 PM »
Have you been following the Rstern SSG on GTA? This is quit the advancement for mrods and other guns. http://www.gatewaytoairguns.org/GTA/index.php?topic=102095.0 Created: 01/08/16 12:00 PM
Description: Sterne SSG
Notes 1: all stock .25 marauder
Notes 2:
Distance to Chrono(FT): 2.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 25.40
Temp: N/A °F
BP: N/A inHg
#          FPS   FT-LBS       PF
50    ERROR 3
49    792      35.38    20.12   
48    786      34.85    19.96   
47    794      35.56    20.17   
46    796      35.74    20.22   
45    797      35.83    20.24   
44    801      36.19    20.35   
43    802      36.28    20.37   
42    797      35.83    20.24   
41    803      36.37    20.40   
40    806      36.65    20.47   
39    800      36.10    20.32   
38    801      36.19    20.35   
37    811      37.10    20.60   
36    807      36.74    20.50   
35    818      37.74    20.78   
34    812      37.19    20.62   
33    809      36.92    20.55   
32    812      37.19    20.62   
31    815      37.47    20.70   
30    811      37.10    20.60   
29    810      37.01    20.57   
28    ERROR 3
27    813      37.28    20.65   
26    ERROR 3
25    810      37.01    20.57   
24    818      37.74    20.78   
23    ERROR 3
22    817      37.65    20.75   
21    810      37.01    20.57   
20    815      37.47    20.70   
19    811      37.10    20.60   
18    811      37.10    20.60   
17    ERROR 3
16    818      37.74    20.78   
15    ERROR 3
14    813      37.28    20.65   
13    818      37.74    20.78   
12    817      37.65    20.75   
11    818      37.74    20.78   
10    808      36.83    20.52   
9     811      37.10    20.60   
8     802      36.28    20.37   
7     799      36.01    20.29   
6     809      36.92    20.55   
5     799      36.01    20.29   
4     808      36.83    20.52   
3     804      36.46    20.42   
2     803      36.37    20.40   
1     792      35.38    20.12   
Average: 806.9 FPS
SD: 8.2 FPS
Min: 786 FPS
Max: 818 FPS
Spread: 32 FPS
Shot/sec: 0.1
True MV: 807 FPS
Group Size (in): 0.00
« Last Edit: January 12, 2016, 12:51:09 PM by Whitney1 »



Monkeydad1969

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Re: SSG and results
« Reply #1 on: January 10, 2016, 05:37:21 PM »
I have been following it and I hope to see what Travis can come up with. 

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ajshoots

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Re: SSG and results
« Reply #2 on: January 10, 2016, 11:16:15 PM »
I was able to go from 50 shots at 905fps with my wifes regulated .177 marauder to 90 shots at 902fps with an ES of 26fps. Put an SSG in my bottled .30, but gains were just better efficiency and no real shot count gain at equivalent power. Dropping the power gained alot of shots but didn't want the power that low.

This is surely a huge leap in the pcp world!! Can't wait to try my prod and other guns.

Windmeister

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Re: SSG and results
« Reply #3 on: January 12, 2016, 11:55:06 AM »
Only way I can see it working efficiently as a one piece with the hammer, is by having the guide being attached to the hammer as described, threaded into the hammer. Then on the backend of the guide there is a hard stop shoulder that have a sliding stop for the spring, so when it is cocked, the hard stop slides through the rear cap, and the sliding stop gets caught by the rear cap compressing it.
Then when it is released the hammer&slide and spring rushes forward towards the valve, the spring gets halted by the sliding stop hitting the shoulder.
The one benefit of this is that there is no ugly nuts or stops on the outside of the rear cap. The negative is that you will have to remove the rear cap as pr. usual to change the spring.
But changing preload would be easy if the rear of the guide was threaded and the "shoulder" was a round nut threaded onto the end. The floating spring stop would be the same OD as the hammer, and act as a centering device, and it would work great since it's held in place by the spring tension all the way until the "gap" is reached and the shoulder moves it off the rear cap.

Uncocked:



Cocked:



For rear cocking guns this solution would be ideal.
« Last Edit: January 12, 2016, 12:00:58 PM by Windmeister »

Whitney1

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Re: SSG and results
« Reply #4 on: January 12, 2016, 06:24:54 PM »
Here's and initial run on a .22 bone stock marauder Created: 01/12/16 06:04 PM
Description:
Notes 1: bone stock marauder .22 with SSG
Notes 2:
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 14.30
Temp: N/A °F
BP: N/A inHg
#          FPS   FT-LBS       PF
58    881      24.65    12.60   
57    889      25.10    12.71   
56    889      25.10    12.71   
55    895      25.44    12.80   
54    882      24.71    12.61   
53    886      24.93    12.67   
52    889      25.10    12.71   
51    883      24.76    12.63   
50    881      24.65    12.60   
49    890      25.16    12.73   
48    896      25.50    12.81   
47    894      25.38    12.78   
46    895      25.44    12.80   
45    891      25.21    12.74   
44    904      25.95    12.93   
43    892      25.27    12.76   
42    904      25.95    12.93   
41    895      25.44    12.80   
40    905      26.01    12.94   
39    894      25.38    12.78   
38    899      25.67    12.86   
37    892      25.27    12.76   
36    911      26.36    13.03   
35    908      26.18    12.98   
34    911      26.36    13.03   
33    909      26.24    13.00   
32    891      25.21    12.74   
31    897      25.55    12.83   
30    907      26.13    12.97   
29    900      25.72    12.87   
28    912      26.41    13.04   
27    914      26.53    13.07   
26    898      25.61    12.84   
25    895      25.44    12.80   
24    891      25.21    12.74   
23    898      25.61    12.84   
22    911      26.36    13.03   
21    913      26.47    13.06   
20    895      25.44    12.80   
19    900      25.72    12.87   
18    891      25.21    12.74   
17    911      26.36    13.03   
16    901      25.78    12.88   
15    907      26.13    12.97   
14    903      25.90    12.91   
13    887      24.99    12.68   
12    918      26.76    13.13   
11    906      26.07    12.96   
10    899      25.67    12.86   
9     899      25.67    12.86   
8     896      25.50    12.81   
7     900      25.72    12.87   
6     894      25.38    12.78   
5     893      25.33    12.77   
4     896      25.50    12.81   
3     882      24.71    12.61   
2     888      25.04    12.70   
1     ERROR 10
Average: 897.5 FPS
SD: 9.2 FPS
Min: 881 FPS
Max: 918 FPS
Spread: 37 FPS
Shot/sec: 0.1
True MV: 898 FPS
Group Size (in): 0.00

Whitney1

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Re: SSG and results
« Reply #5 on: January 12, 2016, 06:43:40 PM »
Forgot the specs 2950 fill ending pressure was around 1950 and I had 8 no reads I deleted

Whitney1

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Re: SSG and results
« Reply #6 on: January 12, 2016, 09:25:22 PM »
Designed a way to use a SSG but not have it protrude very far out back. First sorry for crude drawing the kids are on the computer doing homework so its me and the phone. Ok the hammer has the spring and plunger on the hammer and the plunger can retract into hammer and compress spring and on other end the spring can compress and be adjusted like previous rendition. 
« Last Edit: January 12, 2016, 09:30:20 PM by Whitney1 »

ajshoots

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Re: SSG and results
« Reply #7 on: January 13, 2016, 08:47:40 AM »
Here is my rendition of the SSG. About as simple as it gets but functional. Less than $5 from Lowe's.


I did take the time to machine a much more precise SSG, but due to the length of time it took and the fact that my simple hardware store SSG gave nearly equal results, I won't be machining my own again. I do look forward to purchasing a production model once they are available.

Whitney1

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Re: SSG and results
« Reply #8 on: January 13, 2016, 09:09:50 AM »
simple yet effective. cant go wrong there,and cheap to boot.

Motorhead

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Re: SSG and results
« Reply #9 on: January 13, 2016, 10:59:59 AM »
Just to get on record my early R&D on the SSG also uses common parts, but is a tad more refined in the spring retention & damping of vibration areas ...

The spring retention "Hat" machined to hold an O-ring so the bounce collistion of hammer returning from poppet strike is damped.  Length of hat long to take up distance adding pre-load to oem length spring.
Screw also has a nylon sleeve to reduce friction as it passes within end cap.


A small screw on guide uses the M-rods rear adjuster threads & guides stop rod while providing a solid stop surface.  Assembled it looks like this ...




While adjusting velocity is a PITA requiring a dismantle to tweak it, assemble and test until at desires pellet speed, once done all the mechanics or the system are within the End cap SSG assembly.
While stop screw does protrude upon cocking, it only does so at length of hammer stroke presenting just the head of screw and o-ring.  Design is very clean not having jam nuts or unsightly hardware pieces  hanging off the end of main tube  :P

Another way in skinning the cat  8)
« Last Edit: January 13, 2016, 11:30:44 AM by Motorhead »
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oldpro

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Re: SSG and results
« Reply #10 on: January 13, 2016, 11:28:36 AM »
I Like It!!! Very professional looking, I like your adjustment cap design I might have to borrow that 8)
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Monkeydad1969

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Re: SSG and results
« Reply #11 on: January 13, 2016, 08:31:32 PM »
So, just to clarify for me, does the SSG cock with the bolt or separately?
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int3man

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Re: SSG and results
« Reply #12 on: January 13, 2016, 08:42:28 PM »
So, just to clarify for me, does the SSG cock with the bolt or separately?
Bolt Pushes the Hammer Spring back just like normal.  SSG Stops the spring shorter than normal, as the hammer rushes towards the Valve, thus making it impossible for the Hammer to bounce back spring, and then into the Valve, and open it again.  I hope that helps.  Eliminate the Bouncing and wasting Air.
« Last Edit: January 13, 2016, 09:35:50 PM by int3man »
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Monkeydad1969

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Re: SSG and results
« Reply #13 on: January 13, 2016, 08:45:10 PM »
Thanks int3man.  That clarifies it perfectly for me.

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oldpro

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Re: SSG and results
« Reply #14 on: January 18, 2016, 06:39:51 PM »
 Ok going with internal SSG with no rod protruding. Running crono now.  Created: 01/18/16 06:14 PM
Description:
Notes 1: stock .25 cal marauder
Notes 2:
Distance to Chrono(FT): 1.50
Ballistic Coefficient: 1.000
Bullet Weight(gr): 25.40
Temp: N/A °F
BP: N/A inHg
#          FPS  FT-LBS      PF
29    ERROR 3
28    846      40.37    21.49
27    845      40.28    21.46
26    850      40.76    21.59
25    855      41.24    21.72
24    860      41.72    21.84
23    854      41.14    21.69
22    864      42.11    21.95
21    862      41.91    21.89
20    863      42.01    21.92
19    865      42.21    21.97
18    868      42.50    22.05
17    871      42.79    22.12
16    860      41.72    21.84
15    866      42.30    22.00
14    867      42.40    22.02
13    865      42.21    21.97
12    870      42.70    22.10
11    871      42.79    22.12
10    864      42.11    21.95
9    866      42.30    22.00
8    866      42.30    22.00
7    860      41.72    21.84
6    855      41.24    21.72
5    846      40.37    21.49
4    858      41.53    21.79
3    846      40.37    21.49
2    847      40.47    21.51
1    847      40.47    21.51
Average: 859.2 FPS
SD: 8.6 FPS
Min: 845 FPS
Max: 871 FPS
Spread: 26 FPS
Shot/sec: 0.1
True MV: 859 FPS
Group Size (in): 0.00


Sent from my iPhone
« Last Edit: January 18, 2016, 06:50:23 PM by oldpro »
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