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For much the same reason that stroke volume should be kept constant if...

April 20 2017 at 6:15 PM

Steve in NC  (Login pneuguy)
Crosman Forum Member
from IP address 162.198.201.47


Response to Why limit the possibilities by keeping B+A constant?

...comparisons of pumping effort are to be meaningful.

For example, if the B/A ratio is increased from 1.1 to 2.0, total closed-arm length of the 2.0 linkage must increase by 53% if stroke length is to remain constant. Of what use would a pumping-effort comparison be when the 1.1 action could have been scaled up to the same length and stroke volume but with a 53% longer stroke and therefore smaller piston-head area and proportionally smaller P x A pumping force at any given pressure?

Meanwhile, I appreciate what practical limits on available design choices (e.g., available tubing dimensions) imply for construction projects, but didn't this discussion begin as a theoretical exercise?


    
This message has been edited by pneuguy from IP address 162.198.201.47 on Apr 20, 2017 6:16 PM


 
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