Gemini 3
Gemini 3 was the first crewed mission in NASA's Project Gemini and was the first time two American astronauts flew together into space. On March 23, 1965, astronauts Gus Grissom and John Young flew three low Earth orbits in their spacecraft, which they nicknamed Molly Brown. It was the first U.S. mission in which the crew fired thrusters to change the size and shape of their orbit, a key test of spacecraft maneuverability vital for planned flights to the Moon. It was also the final crewed flight controlled from Cape Kennedy Air Force Station in Florida, before mission control functions were moved to a new control center at the newly opened Manned Spacecraft Center in Houston, Texas.
Crew
Backup crew
Original crew
Support crew
- Roger B. Chaffee
- L. Gordon Cooper Jr.
Mission parameters
- Mass:
- Perigee:
- Apogee:
- Inclination: 32.6 degrees
- Period: 88.3 minutes
Objectives
The mission also tested a system that had originally been designed for the cancelled Mercury-Atlas 10 mission, in which water was injected into the plasma sheath surrounding the capsule during re-entry. This had the effect of improving communications with the ground.
First orbital maneuver by crewed spacecraft
On March 23, 1965, at 15:57:00 UTC, at the end of the first orbit, over Corpus Christi, Texas, a 1-minute 14 second burn of the Orbit Attitude and Maneuvering System engines gave a reverse delta-V of, which changed the orbit from , to an orbit of . This was the first orbital maneuver made by any crewed spacecraft.Flight
Grissom, hoping to avoid duplication of the experience with his Mercury flight Liberty Bell 7 in which the capsule sank after splashdown, came up with the nickname Molly Brown, in a playful reference to the Broadway musical The Unsinkable Molly Brown. Grissom and Young decided on Gemini 3 as the spacecraft's official name, and Molly Brown became its unofficial nickname.The only major incident during the orbital phase involved a contraband corned beef sandwich that Young had smuggled on board, hiding it in a pocket of his spacesuit. Grissom found this to be highly amusing, saying later, "After the flight our superiors at NASA let us know in no uncertain terms that non-man-rated corned beef sandwiches were out for future space missions. But John's deadpan offer of this strictly non-regulation goodie remains one of the highlights of our flight for me."
The crewmen each took a few bites before the sandwich was restowed. The crumbs it released could have wreaked havoc with the craft's electronics, so the crewmen were reprimanded when they returned to Earth. Other crews were warned not to pull the same type of stunt.
Two small failures occurred in-flight. The first was an experiment testing the synergistic effect of zero gravity on sea urchin eggs. A lever essential to the experiment broke off when pulled. The second involved the photographic coverage objective. It was only partially successful due to an improper lens setting on the 16 mm camera.
Early in the flight, the crew noticed the craft gradually yawing left:
00 18 41 I seem to have a leak. There must be a leak in one of the thrusters, because I get a continuous yaw left.
00 18 53 Roger. Understand that you get a continuous yaw left.
00 18 57 Very slight. Very slow drift.
First attributed to a stuck thruster, the problem was traced to a venting water boiler.
The crewmen made their first orbit change an hour and a half into the flight. The burn lasted 75 seconds and moved them from a orbit to a nearly circular one with a drop in speed of. The second burn, changing the orbital inclination by 0.02 degrees, was made 45 minutes later. The last burn, during the third orbit, lowered the perigee to. This was made so, in case the retrorockets had failed, the spacecraft would still have reentered the atmosphere. The experience of reentry initially matched expectations, with even the color and pattern of the plasma sheath that enveloped the capsule matching those produced for ground simulations. However, it soon became clear that Molly Brown was off course and would land off target. Though wind tunnel studies had suggested the spacecraft could maneuver to make up for the discrepancy, Gemini's real lift was far less than predicted, and Grissom was unable to significantly adjust course. Molly Brown ultimately landed short of its intended splashdown point.
This was not the only unexpected event of the short descent: After its parachutes were deployed, the spacecraft shifted from a vertical to horizontal attitude. The change was so sudden that Grissom cracked his faceplate on the control panel in front of him. Later Gemini spacesuits and all Apollo and Space Shuttle used polycarbonate plastic.
Upon landing, the astronauts decided to stay in the capsule, not wanting to open the hatch before the arrival of the recovery ship. The crew spent an uncomfortable half-hour in a spacecraft not designed to be a boat. Due to unexpected smoke from the thrusters, the astronauts decided to deviate from the post landing checklist and to keep their helmets on with the face plates closed for some time after splashdown. recovered the craft and crew. The Gemini III mission was supported by 10,185 personnel, 126 aircraft and 27 ships from the United States Department of Defense.