I got an old picco 40 se.with low run time on rcu.it looks like a rossi 45 too me.it is taching 15,500 with an apc 9x7 is that a better then a os 46ax will turn with the same prop? not sure what engine I should use for my mach racer delta

15,500 with a 9x7 is enough to have a good time, but nothing to write home about. It will fly the Mach racer OK.