Payload Fairing

The payload fairing is the protective shell enclosing the satellite payload during ascent. It shields against aerodynamic loads (up to 3g), aerothermal heating (up to 1,000°C at the nose tip), and acoustic vibration from engine noise. Once the rocket climbs above the dense atmosphere (typically 110 km altitude), the fairing is no longer needed and is jettisoned in two halves to shed mass. SpaceX recovers Falcon 9 fairings using ships and helicopter catches — each half costs roughly $3 million, so reuse is economically significant. Fairing size constrains maximum payload dimensions: Falcon 9's fairing is 5.2 m in diameter.