this is based on the low pressure that builds up under a spinning disc, yes? seems like a difficult way to create a force ... the disc needs to be light so it doesn't require much power to keep it running, but stiff so that it doesn't deflect; and i guess if you mount it on gimballs you'd be able to point the force in any direction ... but i'd've thought that the low pressure would be reacted by atmospheric pressure from both sides = no nett force ??
how did Cranfield get into this ? ... a big enough bag of money I suspect will turn anyone into a 'hore ??