82 x 5.5 m
13x Aeon-R methalox engine
Lift-off thrust 14,900 kN (s.l.)

Terran-R is a two-stage, 270-foot-tall rocket with an 18-foot diameter and a 5-meter payload fairing. Relativity space will prioritize first stage reusability, with the capability of launching 23,500kg to LEO or 5,500kg to a GTO. Terran-R is a 3D printed rocket, with initial versions using aluminum alloy tank straight-section barrels in a hybrid manufacturing approach.
Terran R’s first stage will be outfitted with 13x gas generator cycle Aeon-R methane/LOX rocket engines each capable of  258,000 lb. sea level thrust, while its second stage houses a single AeonVac engine with 279,000 lb. vacuum thrust. Terran R’s 3D printed Aeon R engines
are reusable, and feature a uniquely high-pressure gas generator cycle driving two turbopumps.
The engine composition on the first stage is comprised of four outer fixed engines aligned underneath four landing legs, and nine center gimbaled engines, providing enhanced reliability on vehicle ascent with engine-out capability. On both Terran R stages, the LOX propellant tanks are forward of the methane tanks, separated by a printed common dome. Subcooled cryogenic propellants are used on all parts of the vehicle
except for the first stage liquid oxygen system, where subcooling is not necessary to meet performance goals. Both stages use a cryogenic helium pressurization system to enable better press authority when engines are not turned on by reducing ullage collapse. The vehicle also
features an in-house developed pneumatic pusher stage separation system.

Aeon-R: Thrust 258,000 lbf (s.l.) / 279,000 lbf (vac)