what's the development status of the rocket engine, designed by npo energomash, whose isp (sea level) is no more than 311.3?
(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 311.3^^http://www.w3.org/2001/XMLSchema#float))))