I'm doing a lab on Laminar Flow Elements - Fan Performance Test. So far I have had to find power coefficients (CP), discharge coefficient (CQ) and head coefficients (CH). Ive plotted CH vs. CQ, CP vs. CQ and Efficiency vs. CQ. My last requirement is that I "Use the curve fits to calculate the head versus flow rate curve under STP conditions at 3000 rpm". I have no clue what this is asking or where to start. Can anyone help me on this? Im not really sure what I need to use to get what the question wants.