Yes they are a measure of which prop produces more static thrust for sure. What I am saying is that that measure is a bit useless and unfair if you are looking for a good prop for say your MTO. Even though gyroplanes are slow they are not flying at 30 to 40 mphI guess the question to ask is everything else being equal, is static thrust one indicator of a props performance or not? In other words setting a fixed prop on a tandem pusher gyro, for a Rotax 914 to deliver say 5400 RPM at max RPM on the ground, is static thrust not a measure that can be used to compare two props at least at those parameters? If not, why not? I understand hat this does not automatically mean the props will be comparable in all situations, but it would seem reasonable that static thrust can be used as a reliable starting point. I guess the next question to Fara is: Is there data to show that there is no connection between static thrust and other forms of measurement or is there a linear relationship? Do prop manufacturers have this type of data?