Grumman/Boeing 2-Stage Concepts

Image credit: Grumman
Image source: Mike Acs

H-33 by Bud Parke

Image credit: Grumman
Image source: Mike Acs

532 Flyback Booster

Image credit: Grumman
File source: NASA NTRS

518 Flyback Booster

Image credit: Grumman
File source: NASA NTRS

Design 532

Image credit: Grumman
File source: NASA NTRS

Design 518

Image credit: Grumman
File source: NASA NTRS

S71-38215

Concept shows the Shuttle in flight, heading toward separation of the Booster and the Orbiter at about 40-mi. altitude.

Image credit: Grumman
Image source: Internet Archive