thanks - seems like the new McClaren (F1 replacement) will have a flywheel on board.  not sure how and where it will sit.  I am wracking my brain, as I recently read another car which will deploy the keys system (maybe it was Enzo) not sure.  

i understand the flywheel would not be as productive without the intensity of track driving, but it will be interesting to see who, if any, put it into a road, if they do, how will they package it and what will it weigh