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| Strypi (single stage) | Strypi-11 |
The Strypi was developed as launch vehicle for the Dominic Checkmate Nuclear Test, where it launched a XW-50X1 nuclear bomb to high altitude. It consisted of a Sergeant motor boosted by two Recruits. Later the Strypi was put to use in a number of scientific programs with a variety of different upper stages.
| Version | Strap-On | Stage 1 | Stage 2 | Stage 3 |
|---|---|---|---|---|
| Strypi | 2 Recruit | Castor-1 | - | - |
| Strypi-2R | 2 Recruit | Castor-1 | - | - |
| Strypi-2AR | 2 Recruit | Castor-2 | - | - |
| Strypi-4 | 2 Recruit | Castor-1 | Star-26 | - |
| Strypi-4R | 2 Recruit | Castor-1 | Star-26 | - |
| Strypi-6 | 2 Recruit | Castor-1 | ? | ? |
| Strypi-7R | 2 Recruit | Castor-1 | Alcor-1B | Alcyone / BE-3 |
| Strypi-7AR | 2 Recruit | Castor-2 | Alcor | Alcyone / BE-3 |
| Strypi-9 | 2 Recruit | Castor-1 | Antares-2A | - |
| Strypi-11 | 2 Recruit | Castor-1 | Antares-2A | Star-27 |
| Strypi-12R (Castor Orbus) | 2 Recruit | Castor-1 | Orbus-1 | - |
| Strypi Tomahawk | 2 Recruit | Castor-1 | ? | Tomahawk |
| Swick-B | 2 Recruit | Castor-1 | Antares-2 / X-249 | - |
| DOT | 2 Recruit | Castor-1 | Star-26C | - |