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Re: Speed vs power
Eric, the optimal bore diameter for max velocity at the end of stroke depends on the degree of restriction (and some other factors)and in the FIRST KOP, the restriction of the approved valve is significant when the task is launching the ball some 8 feet high. .
If the bore dia is excessive (think 12 inch dia or more), as you narrow the bore, clearly your end of stroke velocity and thus the height of projectile will improve.
At the other extreme, say your piston bore is the diameter of the smallest restriction in the air path to the cylinder. Because of the small bore size, it will have insufficient force (given your 60psi pressure limit) to accelerate the ball very well... perhaps not even be able to lift it. Widening the bore from this extremely narrow scenario will improve acceleration.
As you can see both of the extremes I describe are very poor performance. IF you charted it, there is a peak for performance ( maximum end of stroke velocity) in between these two extremes of bore size. To calculate the perfect bore size is fairly complex but it can be done if you have a really good handle on flow calcs. It may be easier to experiment with standard sizes you have on hand. 0.75, 1, 1.5, 2
Frank
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