Thank you. I hope my motor will work as well as yours! I think I will test it with the ring magnet first, then add the 5x5x1 N45 magnets.
I have 26 turns of #26 wire (~ 4mm). What size prop will be good for a slow flyer like the GWS Tiger Moth? Battery will be either 8.4V NiMH or 7.4V li-poly.
In the USA, metric ball bearings with and without flange are available from McMaster-Carr
. They are rated 50K+ RPM. But they are expensive -- $8-$14 each -- so I used the $2.50 GWS bearings.