0 to produce useful thrust, a large jet velocity that exceeds flight speed by a considerable margin can be quite harmful to propulsive performance. Highest propulsive effectiveness is approached if the jet velocity is sort of equal to (but, of necessity, a little higher than) the flight velocity. This participation https://johnnywbhmq.wikiap.com/680713/the_smart_trick_of_phuket_jet_ski_that_no_one_is_discussing