we have a 50kg disc with at least 75% of the weight at the edge, 1m wide and spins at 900 rpm (the current gearing means it can go to 1200rpm but we hadnt balanced the disc well enough). Even so we can deliver around the 40kj mark we reakon.

My ruff maths only puts Typhoon at 25-27KJ
not far off the maths I worked out for my cage spinner (work robot that never got finished)

no doubt is good i just thought 40kj was a tad high