Cheers Dan and Graham. Well the DA 50 can certainly afford to be de-rated. A 3 blade prop would be good but I didn't want the complexity of building one that is why I went for the wide 2 blade. This is what is known as blade solidity or the ratio of blade area to swept area and this wide blade should be fairly similar to a normal 3 blade. As for pitch, I suppose it is really about down line braking but it's all a bit of an unknown due to the high volume/drag of this fuselage although I have done a fairly slippery wing. As you say it will be fun finding out.