Best desing for a spinning top?

Question

there is a trick in designing a spinning top which allows it to spin for a long period of time. my teacher tells me that no one has figured out the trick....any help??

Answer 1

Large diameter, with very dense material at the outside.

This give you the highest momentum for a given RPM.

Edit: Some links:

http://www.tjf.or.jp/eng/content/japanes...