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Could anybody explain to me some derivation in David Gingery's work ?

thread1043-291611

Could anybody explain to me some derivation in David Gingery's work ?

Could anybody explain to me some derivation in David Gingery's work ?

(OP)
In David Gingery's work on
"How to design and build centrifugal fans for the home shop" he defined

h = (velocity/66)*(velocity/66)

where h is pressure in inches of water column

Question is where does 66 come from? Thank you.

  

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