Atlas B
USA Wikipedia 
Built & Operated By
Convair
Commercial · founded 1943
Family
Atlas
variant B
Maiden Flight
19 JUL 1958
About
The Convair SM-65B Atlas, or Atlas B, also designated X-12 was a prototype of the Atlas missile. First flown on 19 July 1958, the Atlas B was the first version of the Atlas rocket to use the stage and a half design with an operational sustainer engine and jettisonable rocket booster section. Unlike later Atlas models, the Atlas B used explosive bolts to jettison the booster section.
Vehicle Specifications
Height
31.4 m
Diameter
3.66 m
Launch Mass
3 T
Stages
1
Configuration
Expendable
Launch Record
Total Launches
1
Successful
1
Failed
0
Consecutive
1
Performance
To LEO
68 kg