📊 Analysis
Statistics & insights on rockets and organizations — technology, history, numbers.
Thor Delta E1
RetiredMcDonnell Douglas
American orbital launch vehicle family with Thor first stage and a delta second stage.
Key figures
Total launches
17
Successes
16
Failures
1
Success rate
94.1 %
Success streak
1
Maiden flight
Jul 1, 1966
Reusable
No
Shortest launch interval ⓘ
27d 1h
Planned launches
0
Thor, Thor-Delta family total
85 launches · 75 successes · 10 failures (15 variants)
🧐 Data check
Automatic plausibility checks — anomalies are surfaced transparently here:
- ℹ️The figures above apply only to the “Thor Delta E1” variant. The Launch Library counts each variant separately — the Thor, Thor-Delta family totals 85 launches across 15 variants.
Technology
Length
28 m
Diameter
2.44 m
Launch mass
68 t
Liftoff thrust
1,450 kN
Stages
4
LEO (low Earth orbit)
540 kg
GTO (geo transfer)
150 kg
Launches per year
of which in our database: 17
Successes Failures Other/planned
History & events
Sources
- Launch Library 2 (The Space Devs)
- Wikipedia