find a bipropellant rocket engine, that has a status of test fired, whose thrust (sea level) is more than or equal to 784000.0.
(AND spaceflight.bipropellant_rocket_engine (AND (JOIN spaceflight.rocket_engine.status m.03p41f2) (ge spaceflight.rocket_engine.thrust_sea_level 784000.0^^http://www.w3.org/2001/XMLSchema#float)))