Now, this may well not be possible - in which case I'll have to come up with an alternative. BUT, if anyone has any neat ideas on how create a bad-boy like this (that is also preferably safe) you'll save me the price of a miniature turbine engine. What I need is a to find a motor capable of getting a (fairly hefty) 12" steel disc up to 10,000 RPM, as well as a variable speed drive capable of managing such a beast. Acceleration speeds and the like are no issues, the only requirement is that it can reach 10,000 RPM... and is safe (can contain it if necessary). It's for testing the accuracy of part of a device that measures the RPM of a turbine engine. Any helpful tips and pointers? I'm open to suggestions! Bodge-jobs are welcome (eg. one option I'm currently looking into is stripping down a disc sander).