AMB

rotating case electric motors :Ok folks The Dutch have discovered rotating case motors
and have gone very GIANT scale.They are building a city bus with the tire attached to the rotating case and the speed control at the back of the unit quote "no gear box"
this in NY times technology section today. Now when they they get it gown a little
smaller how about an electric ultra-lite ?need lots of lith cells however.

clausxpf

The outrunners is not invented by the Dutch... but by a Poland .
Never the less it is working.. and electric flight has been done in Germany, and done mostly by solar power...
The LRK principle to generate an electronic gearbox and have high torq is used a lot here in Europe. And the best of it all it is at prices that allow a lot of people to play with it.
Claus

DeuceTrinal

Actually, small LRK motors have been around quite a while. CD rom drives use them, and guys have been pulling them out of cd rom drives 10 years and more old. They are re-winding them and flying parkfliers on them. They can make a motor with power equal to about a 280 brushed at less than 1/3 the weight, a big savings in models that weigh less than 5 oz. sometimes.

/Deucetrinal

hroachen

LRK's and CDROM motors are both outrunners, but most CDROM motors use a 9 tooth stator and 12 pole magnet. A true LRK motor uses a 12 tooth stator with every other tooth empty and a 14 pole magnet.

D