Update on my SSP project, I've made a little progress with

Update on my SSP project, I've made a little progress with

Joined: June 25th, 2002, 1:34 pm

August 5th, 2012, 1:18 pm #1

my tune, it seems like I have enough volume because the gun responds well to pressure increases(typically, if the volume is to low increasing pressure dose not produce a significant increase in power) I'm thinking that my next gun will have a smaller diameter piston. I'll have some new numbers from this one in a day or so.
Last edited by jpsaxnc on August 5th, 2012, 1:21 pm, edited 1 time in total.
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Joined: June 25th, 2002, 1:34 pm

August 5th, 2012, 1:54 pm #2

10.5 cph's 694fps. 11.2 fpe. 8.3 super domes 764fps. 10.7fpe. 7.0 hobbies 819fps. 10.4fpe. (ran out of cpl's).
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Joined: July 4th, 2012, 7:51 pm

August 5th, 2012, 4:48 pm #3


........especially in .177. Performance is remarkable - hows the cocking effort?


Update:

I read your post on the yellow (can't post there yet). Thats cutting edge stuff for sure.

I think what we're looking at is....FT = MV. Since the valve is low volume then time is not your friend. To max out V for any given M, F or transfer pressure becomes critical. It looks like you've hit a near perfect balance between the compromise of flow rate and transfer volume. Also, the heavy's should outperform (fpe) because of two reasons. A slower acceleration due to higher mass will give the FT side a boost by allowing the force to stay higher for a longer time; also, there is always less energy loss with lower velocities. Going forward, I wouldn't know how to improve (efficiency) if you've already eliminated or minimized all transitions (size, shape, direction) in the transfer.

Awesome!


WyoMan
<img alt="[linked image]" src="http://i1249.photobucket.com/albums/hh5 ... mping2.jpg">
Last edited by WyoMan on August 5th, 2012, 5:58 pm, edited 1 time in total.
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Joined: June 25th, 2002, 1:34 pm

August 5th, 2012, 5:28 pm #4

the gun, with a slightly longer pump arm and smaller piston, which would reduce the effort, don't know by how much though.
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Joined: November 28th, 2002, 6:26 pm

August 5th, 2012, 5:53 pm #5

...as you yourself proved several years ago, there are alternatives!



Steve
Last edited by pneuguy on August 5th, 2012, 5:53 pm, edited 1 time in total.
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Joined: February 17th, 2010, 3:30 am

August 5th, 2012, 6:15 pm #6

Is this a sliding linkage of some kind?.... Please explain....

Bob
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Joined: June 25th, 2002, 1:34 pm

August 5th, 2012, 7:45 pm #7

a 4-1 ratio.
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Joined: February 17th, 2010, 3:30 am

August 5th, 2012, 8:12 pm #8

on the first part of the stroke it's a 4:1 ratio and once the linkage is less than 90 degrees to the arm it slides back to virtually the same as stock?.... or close to stock?.... I guess I'd have to see it in action, or at least posed in several positions to understand....

Bob
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Joined: July 4th, 2012, 7:51 pm

August 5th, 2012, 8:39 pm #9

...as you yourself proved several years ago, there are alternatives!



Steve
.......but maybe from more than one place. I wonder if a strong spring (springer type) could be put in the pump tube in between the pivot pin and the piston. The spring would compress when opening the forearm and then assist with the compression when closing. It may not work if the forearm is too hard to open - or - if the spring doesn't deliver enough stored energy near the TDC of compression. I was also thinking about roller bearings on pivot points????

WyoMan
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Joined: April 28th, 2010, 12:23 am

August 5th, 2012, 9:00 pm #10

...as you yourself proved several years ago, there are alternatives!



Steve
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