532 Flyback Booster

Shuttle Program at Astronautix

Grumman & Boeing Phase B at PM View

Image credit: Grumman

Image source: NASA NTRS

MDAC Canard Booster

Shuttle Program at Astronautix

MDAC Phase B Shuttle at PM View

Imaged credit: NASA

Image source: NASA NTRS

NAR Booster Concept

Shuttle Program at Astronautix

Image credit: North American Rockwell

Image source: Numbers Station

Convair Flyback Boosters

Shuttle Program at Astronautix

Image credit: Convair

Image source(s):

Atlas Negative Collection

Dennis R. Jenkins

Gjertson Booster Concepts

Shuttle Program at Astronautix

Image credit: Convair

Image source: SDASM Archives

GD/Convair B9U booster

Shuttle Program at Astronautix

Image credit: Convair

Image source: SDASM Archives