Rewinding cd-rom motors for high rpm in 50 mm ducted fans for electric jets. 6 magnetpoles instead of the standard 12magnetpoles for more rpm:
http://www.rcgroups.com/forums/showthread....threadid=140736
http://www.rcgroups.com/forums/showthread....threadid=193263
http://www.rcgroups.com/forums/showthread....threadid=186326