RE: 1/2A ducted fan???
I keep hoping that GKamyzs will get his half-a fan design done and cut. He's really into the math/Formulae end of ducted fans and for a while was talking about something like this. The main problem with fans to date is that the diameter is too large for the application. 3" seems to be a default because the airframes were large due to weight and the thrust was needed to get them going-The Midwest A-4 is supposed to be a pooch from what I hear. These guys need smaller diameter and higher pitch.. GKamyzs had an impellor for something this size rapid prototyped at one time for an electric, now he has the CNC machines to make molds. Hint-Hint.
Well, maybe after the baby comes. Mrs. GKamyzs are expecting their first any day now! WHOOT!!