Regarding 3D prop size, I'm a first season 3D rookie, so still a ton to learn. Flying a 10.5lb Funtana 125 w/26cc RCGF/Aerovate, so you DLE guys have even more power than I do. I think the 8" or 10" pitch props are both going to fly the 3D planes OK, but wondering why you might want the kind of top end speeds produced with that kind of pitch on a 3D plane? I think you might be further ahead letting the engine rev up a little with a 6" pitch prop? I think the 6" will be much kinder regarding flutter on the over-sized 3D control surfaces by limiting top end speed (though still a big concern!), will increase available thrust (ability to accelerate out of a hover or while vertical), and the thing will stop on a dime when throttled down (depending on CG). FWIW