>>1853957Heart doesn't say what motors this will use. Some pages say Magnix motors. The biggest Magnix motor uses 560 kW at cruise. 1 Watt = 1 Joule/second. 1 Joule = 11e-15 grams per E=mc2. So:
(560e3 W * 1 J/W * 11.1265e-15 gram/J)*(3600 sec/hour)*(4 motors) = 0.00009 grams lost per hour of flight.
Good luck measuring that.