I did a plot of chord of the three props mentioned
recently. The props were of 74-76 inches in dia and made by Catto (2) and
Performance Prop (1). Note my Performance Prop was shorter only 74
compared to Sams and Dennis Catto Props. When mine was 76" in dia my
static was lower than 6000 which would have all three props pretty much on a
straight line. I don't know if one could make much of a linear
relationship between prop chord and rpm based on just three data points, but
thought some might find it interesting.