BBC Explains Why 1,650km/h Equatorial Boost Can Cut Rocket Fuel Needs
Updated
Updated · Sky at Night Magazine · Jul 26
BBC Explains Why 1,650km/h Equatorial Boost Can Cut Rocket Fuel Needs
2 articles · Updated · Sky at Night Magazine · Jul 26
Summary
A launch near the equator can give rockets a 1,650km/h head start from Earth’s rotation, reducing fuel needs or allowing heavier payloads for some missions.
That advantage is strongest for geostationary satellites, while inclined or polar missions often lose it because they require fuel-intensive course changes after liftoff.
Altitude helps far less: even Mt Everest’s 8.8km height mainly lowers air pressure and slightly improves engine efficiency, but mountain-top spaceports are usually too costly and hard to supply.
Payload economics drive those trade-offs — Curiosity’s 900kg rover rode on an Atlas V 541 with a liftoff mass above 530,000kg, most of it fuel.
Logistics still limit ideal siting: only nine of roughly 100 listed launch sites are within 10° of the equator, so many operators instead launch as far south as practical and usually head east.