May I ask a newb question? I see that the 915 has the same exact bore and stroke on its pistons as the 912/914 engines. Does this mean the only way the new 915 is making more HP is that it's going to higher RPM's versus the 912/914? Hence your statement that a fixed pitch prop wouldn't take advantage of the engine's HP because it's essentially the same engine and has roughly the same HP/torque curves at the lower RPM's as the 912/914? The only way to take advantage of the higher horsepower at higher RPM's is to keep the engine spinning at the high RPM's and adjust the pitch of the prop for max thrust during takeoff and max forward speed at cruise? I did read an article on the SeaReys that said cruise RPM was 4800? So that actually seems lower than normal cruise RPM? If it's making more power due to higher boost/more oxygen in the fuel/air mixture, then why isn't a fixed blade prop going to work if the RPM range is the same? That's where I'm getting confused. Is it due to the changed reduction unit? Why would they change that if so?
Thanks,
Brandon