1961-S135
The first piloted Mercury mission was MR-3 (Mercury-Redstone 3), which used spacecraft number 7. America's first astronaut was USN Cdr Alan B. Shepard, Jr, who left the pad a few weeks after Gagarin's flight.
After the Redstone separated, Shepard extended the periscope and carried out manual attitude control tests.
Launch mass was 1832 kg. 'Orbit' mass was 1295 kg with mass of 1170 kg at reentry. 25 kg of fuel was on board of which 3 kg was used prior to retrofire and 2 kg used between retrofire and reentry. This suggests a 120 kg retropack and a 537 kg LES and an 1150 kg MR dry mass.
| MR-3 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1961 May 5 | 1434:13 | Launch by Redstone LV7 from LC5 | |
| 1436:35 | LES jettison | ||
| 1436:35? | Redstone burnout | ||
| 1436:45 | RS sep, retropack sep burn | ||
| 1438:57 | Retrofire sequence begins | ||
| 1439:24 | Apogee 187.5 km | -6214 x 186 x 30.62 | |
| 1439:27 | Retrofire | ||
| 1440:27 | Retropack jettison | -6230 x 186 x 30.6 | |
| 1442:01 | Entry | ||
| 1443:51 | Drogue parachute out | ||
| 1449:35 | Splashdown in Atlantic Ocean,15:22 | ||
| 1459 | Recovery by USS Lake Champlain | ||
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