Hay Wayne 22,
I swapped the Four Star 60 for the Four Star 120. I think the OS 25s will do the job. The throttles will be opened by 81 servos.
Lets talk about three Blade props.
Question,
What happens to low quality 3 blades at the high rpm levels? It seems to me that the 3 blade changes its shape when subjected to high rpms. And in so doing changes the performance of your aircraft.
Bear with me.
A 17 pound C130 running 3 blade props may have a better chance of rotating on ¾ throttle. The props just might sustain there integrity up to that rpm setting. But a higher rpm setting could prove to be less productive. As you say , It flattens out. I have designed a test device that will measure the pull of a 3 bladed prop at controlled rpm settings. I think I can reach a happy medium by testing and comparing the results between 2 and 3 blade props. It’s possible that even a lesser quality 3 blade prop could still out perform a 2.
I also think I have to much time on my hands. I was forcibly retired from my job for an injury in 2004. I am gonna be 62 so I need to get going on this build.
Chuck