how far along in development is the engine designed by npo energomash, with a sea level not greater than 305.0?
(AND spaceflight.rocket_engine_status (JOIN (R spaceflight.rocket_engine.status) (AND (JOIN (R spaceflight.rocket_engine_designer.rocket_engines) m.02p_3s6) (le spaceflight.rocket_engine.isp_sea_level 305.0^^http://www.w3.org/2001/XMLSchema#float))))