http://www.powerditto.de/navigationengl.html - it's for motor conversions but most of the methods are the same...
These people take tape drive motors and turn them into model airplane 500watt screamers or 20 minute flight time cruisers - The cheap lithium batteries performance curves make it possible, with the airflow from high speed flight keeping them cool.
I've got a bunch of zip-tape-drive motors I'm playing with - remember its the bearings and bell housing thats easily damaged, I've held off untill I get the tools together to press them on and off w/o damaging anything.
Since diameter is so small output will be low, and its hard NOT to saturate the coils trying to get more power out of them. They have a composite magnet material cast inside the bell that sould be removed and replace w/ Neos - but I think small rod magnets would make a stronger pulse w/o saturating the neighboring teeny coils then the small plate style they use in motors...
