...The actro's and lrk's seem to work very well, but never to the specs I've read, always below the geared inside runners. Also a weight penalty since a big direct drive outside runner that can be run at the same power level is almost always a lot heavier. One large direct drive motor I know of works really well,.. almost equivalent to the C50 hacker, but at 3 lbs instead of 1 lb
I see, although I do not like the noise gearboxes emit. With the kind of power Mr Shuman had on his plane, he could probably also have used an outrunner, the additional weight would not be much of an issue. He admittedly peaked in at 92-93 dB during his measurements, which is quite close to the 94 dB-limit in F3A competitions.
Anyway, we will see more electric pattern planes at our fields and at competition in the future, I hope that prices will soon go down.
Regards,
-Fabrizio