sonic, subsonic, transonic

hypersonic, subsonic, transonic, stealth bomber, afterburning, turbofan engine, turbojet engine, stealth fighter, multirole, rocket propulsion, ramjet engine, sonic boom, jet propulsion, geosynchronous, ballistic trajectory, suborbital, unmanned, airframe, antigravity, orbital velocity, bipropellant, propeller plane, lightspeed, jacqueline cochran, ballistic missile, multistage rocket, igor sikorsky, aero engine, engined, manpad, magnetic levitation, drogue parachute, spaceward, jumbo jet, thermobaric bomb, microlite, inertial guidance, wernher von braun, accelerative, unpowered, fighter aircraft, pipistrel, instrumented, antiballistic missile, outer space, wild blue yonder, wankel engine, ejection seat, german luftwaffe, pilotless aircraft, hypergolic, thermonuclear, antisatellite, airborne, submarine, proton accelerator, cruise missile, electronic warfare, thermobaric, aeronautic, chuck yeager, earthward, maglev, reciprocating engine, quadrupole, sounding rocket, dirigible, lucky lindy, inertial navigation system, aerobatic, stealthiest, jimmy doolittle, antiaircraft, ejector seat, mirv, interstellar, rotary engine, unairworthy, seater, icbm, underslung, amphibious, laminar flow, lunar excursion module, wankel rotary engine, drogue chute, inertial, astronautical, aircrew, perilune, fighter pilot, intercontinental ballistic missile, whirlybirds, particle beam, megaton, space shuttle, rotary wing, cherenkov radiation, jumbojet, thermodynamic equilibrium, black hawk, supercharged, laminar, axisymmetric, baroclinic, collisionless, geostrophic, turbulent, advective, altitude, convective, barotropic, engine, irrotational, sonic, collimated, highaltitude, hydromagnetic

heterodyne receiver, range, superhet, superheterodyne receiver

inaudible, ultrasonic, unhearable