Third-generation shuttle proposal (late 2020s, cancelled ~2032). MK4 airframe with
internal tankage for full reusability; 3× RS-25EX, CERV-heritage 4 m boosters with
downrange sea landing; 30 t to 650×650 km 51°; 86 m orbiter; 4 crew; ~$35M/flight
target. Competed against Vulture in same government tender. Design elements later
absorbed into Vulture Block 1.5/Block 2.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
