Below 16" has too many diminishing returns to be fruitful. Acer made a 12" version over a year ago, but it's just too small to be useful outdoors and indoors there are funner things to fly. I'm having so much fun with the µsw
running the Feigao Brushless on 3-cell 830 lipos at about 4.6 AUW, I decided to make another lighter version using 3-cell 340 lipos. It should come in at about 3.7 oz. AUW with the lighter cells and a couple of other mods for even more fun
. These do totally unlimited vertical. The 4.6 oz. will do about 30 MPH vertical and 70 MPH level flight. The 3.7 oz. should do vertical at about 45 MPH and 70+ MPH level flight.