1961-S216
Capt. Virgil Grissom, USAF flew the Mercury-Redstone 4 mission in spacecraft 11, named Liberty Bell Seven.
Launch was on azimuth 100 deg corr. to -6200 x 190 km x 30.1 deg.
MR-4 splashed down after flight lasting 15 min 37 sec, 486 km downrange in the Atlantic. The spacecraft hatch blew, and Grissom escaped from the spacecraft as it started to take in water. The pilot was recovered by a helicopter from the USS Randolph, but the spacecraft sank. It was finally located in the Atlantic Ocean by a robot submarine in May 1999.
| MR-4 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1961 Jul 21 | 1220:01 | Launch by LV8 from LC5 | |
| 1222:24 | LES jettison | ||
| 1222:31 | T+2:30 Redstone MECO, 2.0 km/s | ||
| 1222:34 | Redstone sep | ||
| 1222:34 | Posigrade burn 10.5 m/s | ||
| 1224 | Apogee 190 km | ||
| 1225:11 | Retrofire | ||
| 1226:08 | Retropack jettison | ||
| 1226:41 | Periscope retract | ||
| 1227:47 | Entry | ||
| 1229:42 | Drogue parachute deployed | ||
| 1235:38 | Splashdown in Atlantic (15:37) | ||
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