PP3D has a MOI on it's disc of 1.946896539 kgm^2. With a rotational velocity of 2500rpm or 261.7993875 rad/s that results in a kinetic energy of just over 66kJ. Those figures for MOI came from CAD. Of course these are perfect world with no resistance figures. The actual KE is probably a good 10% lower but that doesn't sound as impressive for the cameras.

If you don't have access to CAD to calculate your MOI you can use the team cosmos calculator to do it for you (with a few assumptions about shapes etc). http://www.teamcosmos.com/ke/ke.shtml

It is in imperial units but converting your dimensions to inches isn't difficult