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I have obtained the following formula from a textbook for power output. unfortunately i don't know what units the formula requires, is anyone able to confirm what they are? Also, if anyone knows of a good resource for pump design please let me know!

right

P=2rANtan@(p2-p1)n

where

P=power

r=radius of centre of piston from axis

A=area of piston

N=number of pistons

@=swashplate angle

p2 and p1 = pressure differential

n=either rpm or revs per second - i don't know

I need the forumla to be in metric form - basically, if i use

P=Watts

r=metres

A=metres^2

p=pascals

n=rpm/rps

Will the formula be correct?

Many Thanks

Ed