Those are good numbers for an AX......a lot of people use 9" props on the Rossi's and get higher RPM numbers, but I dont need additional power. At close to 2.2 hp for the R45, I got all the power I need. I will however, buy another Rossi (.60) since I am very happy with the R45.....especially because I got it near new for $80 and runs on FAI home brew!