[Healeys] Mech Engineer Question

[Perry]

Thought I would do a fairly simple calculation on a four blade fan I was looking at to figure out the CFM at several different RPM’s. 
At my age I have learned to ask for help when things don’t look right.
Can someone check my results on this and let me know?
Fan pitch= 1-1/8 inch or 0.09375 feet
Fan overall diameter=14.75 inches or 1.23 feet
CFM @ 700 RPM =3066 CFM
CFM @1000 RPM =4380 CFM
CFM @4000 RMP= 17520 CFM
Thanks
Perry


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