ORIGINAL: SCALECRAFT
Just for the sake of info,, the Dave platt Bf 109G6 with a 78+- span flew very well on an OS 108 @ around 18 to 22 lbs.
Steve
Im sure it would because the OS 108 has a max RPM range up to 16000@ 3.0hp.
That is what is confusing about OS specs for the 120AX because it lists a max rpm of 9500. Im thinking its probably a typo on their website since 9500 would be a 4 stroke max rpm for soemthing rather large.
Shummie.....if you can, mount the 120AX to a motor stand or something secure and test run the motor with a tachometer guage(rpm meter). If you get over 12000 with a 14x10 or 15x6, your good to go.