Mercury Redstone 4 Spacecraft: S/C-11 Launch Vehicle: Redstone MR-8 Launched: 21 Jul 1961 Prime Crew	⇑ Mission List ⇑ Designation: Mercury R S-2 Description: 2nd Mercury Redstone manned suborbital
	V I Grissom Backup Crew J H Glenn

Duration: 0.012 days Apogee: 189 km (117 mi) The Mercury capsule, Liberty Bell 7, manned by Astronaut Virgil I. Grissom, boosted by a Redstone rocket, reached a peak altitude of 190.3 km and a speed of 8,335 km per hour. After a flight of 15 minutes and 37 seconds, the landing was made 487 km downrange from the launch site. The hatch blew while still in water, and the capsule sank; Grissom saved, though his suit was filling up with water through open oxygen inlet lines. References: Grimwood, James M. 1963. Project Mercury: A Chronology. NASA SP-4001. Encyclopedia Astronautica. Wikipedia.