We designed a similar idea for our Heavyweight which gives us a fast spin up time due to the dual stage flywheel. We had plans for a flipper onteh front powered by the flywheel, but weight run out and we canned the idea. My team mate is now building a featherweight/lightweight using a vert flywheel to store energy for a flipper.

The only problem I see with the Whyachi bot is that it seems to stall the flywheel when the flipper fires.