The prop is a handmade WILGA 19x7 semi-scale carbon & wood composition by Biela. I am using it as my show prop for now since the Saito 1.80 is new, and want to break it in well before flying with this large prop. The 1.80 FS likes an 18x6, and the 19x7 is just a little above the best power curve for this engine. I may run it in the future, and see what rpms I get before seeing how it pulls the Gee Bee around. This prop is costs 55.00, about the same as everyone elses carbon fiber props. http://www.aircraftinternational.com...rbonProps.aspx