Quote from Wide Tailz:
I am not aware of any propeller with usable efficiency that can take 300 hp at 6k rpm. If you're planning a ducted fan, lolz.
I am using a ducted 15 blade fan. Which I've already constructed. And I 'll be boosting the engine to 450HP.
Giving me a projected power loading of around 4 lbs/HP. Well within the range of RC ducted fans. Differences in power loading of course being the biggest reason the RC guys get their DF's to perform as opposed to full scale attempts, up to this point.