This is what 19.9" Vario props look like on a 100" P-38, very nice props, but I have no flight experience with them yet. I have learned it takes a lot of energy to spin props at IC RPMs. You can get better performance spinning higher pitched props at a lower RPM....for a given amount of power. Problem is finding the props you want. APC has a lot of higher pitch 2 blade props, but a very limited three blade selection. I think the 15.75x13x3 APC would be perfect on this plane (if they look OK) spinning in the mid to high 5K range (at your motors power level). I've been looking over my datalogs, and if the KV on the eflites was just a little lower, it would be okay on watts as well. At 6494 RPM, which is 90% of the no load RPM, I think it will be pulling more than 1110 watts most of the time.
I would maiden it with one of the APC thin electric two blade props and go from there. Will likely end up with MA 14x9 or 16x10 maybe trimmed and rounded to 15x10. Good thing is all these props are relatively cheap. Don't get hung up on static numbers with MA or G sonic props, they both unload a lot in flight
Links to check out G sonic props, vario props, and MA
http://www.ramoser.de/home_e/variopr...rioprop_e.html
http://www.allerc.com/props-graupner...-c-36_444.html
http://www3.towerhobbies.com/cgi-bin...2Fb%3E+3-blade
