Thanks DS

It pretty much clarified me. Im using .61 HB's 2C german engine in my easy sport locally made plane, as engine gave me hard time, and I had received so many great advices how to tune the engine up and run it well, and hopefully this sunday, Im gonna put in the feedback how well it flew. At the moment Im using 11x7.7 prop of Thunder Tiger's Cyclone, but I read in prop chart that 11x7 is the right prop for it. I wanna do maneuvers on it and ofcourse I love vertical pull, so which is the best prop for it?

Thanks