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Jim Gillilan's Custom 1322 Carbine

Jim Gillilan's Custom 1322 Carbine w/Custom Stock

Here's one I'm especially proud of and is modded all over, doing 12fpe at 15 pumps.
Stock is Teak from Thailand and super light weight 1322 Carbine!

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Why limit the possibilities by keeping B+A constant?

April 20 2017 at 4:43 PM

CO222  (Login CO222)
Crosman Forum Member
from IP address 27.252.177.19


Response to Stipulation #1 makes it true. To keep a constant stroke while increasing the B/A ratio...

I agree that the 5.0 ratio in my analysis results in an impractically long airgun.

But there are plenty of ratios say from ~1.0 to 2.0 that still result in a practical length.

I disagree that we should prioritise fixing B+A length over stroke length and bore diameter.
When I designed my pump I had certain tube stock that could not readily change diameter,
and I wanted a certain swept volume output, so stroke length was fixed.
However it was quite practical to give or take an inch or two from the airgun's length,
so the B+A value was given flexibility.

One thing remains constant: there's no fair comparison when you have so many variables.
To make it a fair comparison of one imposed parameter, it's unfair on the others, and vice versa.
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