To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

Mercury-Redstone 4

From Wikipedia, the free encyclopedia

Mercury-Redstone 4
Grissom Climbs into Liberty Bell 7 - GPN-2002-000048.jpg
Astronaut Gus Grissom climbs into Liberty Bell 7
Mission typeTest flight
Mission duration15 minutes, 37 seconds[1]
Range486.15 kilometers (262.50 nmi)
Apogee190.31 kilometers (102.76 nmi)
Spacecraft properties
SpacecraftMercury No.11
ManufacturerMcDonnell Aircraft
Launch mass1,286 kilograms (2,835 lb)
Crew size1
MembersVirgil I. Grissom
CallsignLiberty Bell 7
Start of mission
Launch dateJuly 21, 1961, 12:20:36 (1961-07-21UTC12:20:36Z) UTC
RocketRedstone MRLV MR-8
Launch siteCape Canaveral LC-5
End of mission
Recovered byUSS Randolph
Landing dateJuly 21, 1961, 12:36:13 (1961-07-21UTC12:36:14Z) UTC
Landing siteNorth Atlantic Ocean
27°32′9″N 75°45′57″W / 27.53583°N 75.76583°W / 27.53583; -75.76583
Liberty bell insignia.jpg

Spacecraft name as painted on capsule side, with a "crack"
Grissom prepares to enter Liberty Bell 7 61-MR4-76.jpg

Virgil Ivan "Gus" Grissom
Project Mercury
Manned missions

Mercury-Redstone 4 was the second United States human spaceflight, on July 21, 1961. The suborbital Project Mercury flight was launched with a Mercury-Redstone Launch Vehicle, MRLV-8. The spacecraft, Mercury capsule #11, was nicknamed the Liberty Bell 7, and it was piloted by the astronaut Virgil "Gus" Grissom.

The spaceflight lasted 15 minutes 30 seconds, it reached an altitude of more than 102.8 nautical miles (190.4 km), and it flew 262.5 nautical miles (486.2 km) downrange, landing in the Atlantic Ocean. The flight went as expected until just after splashdown, when the hatch cover, designed to release explosively in the event of an emergency, accidentally blew. Grissom was at risk of drowning, but he was recovered safely via a U.S. Navy helicopter. The spacecraft sank into the Atlantic, and it was not recovered until 1999.

YouTube Encyclopedic

  • 1/3
    126 799
    188 419
    5 632
  • Project Mercury: The First Americans in Space
  • Mercury-Redstone 1 Launch failure (MR-1)
  • Five Minutes in Space #7: Gus Grissom & Liberty Bell 7


Project Mercury, America’s first human spaceflight program, lasted from 1958 to 1963. And in those few years, NASA went from a rocket that launched half an hour before it was supposed to and blew up on the launch pad, by the way all the way to putting someone in orbit for almost a day and a half. And at every step of the way, they were solving problems that influenced the future of the American space program. Project Mercury started out with three specific objectives: One, NASA wanted to put a human in orbit around Earth; two, they wanted to see how the human body responded to being in space since no American had ever left Earth before; and three, they wanted to bring the astronaut and their ship back to Earth safely. And yes, it’s a little alarming that putting someone in orbit and bringing them alive back were separate goals. The first launch of Project Mercury was on August 21, 1959, and it did not go well. The goal of Little Joe 1, as the unmanned booster was called, was to test the escape system you know, that thing that astronauts would need in case something went terribly wrong. About half an hour before the scheduled launch, there was an explosion. When the smoke cleared, the crowd that had gathered to watch the rocket lift off saw that Little Joe had unexpectedly launched. At least, parts of it did. Other parts were still sitting on the launch pad, waiting to be sent up into the sky. The problem was that a pair of electrical circuits got crossed, which sent mixed signals to the rest of the ship. The next launch, Big Joe 1, successfully tested the heat shields though there were still problems with the actual launching part of things. Throughout the project, the unmanned missions would continue to be plagued with launch problems. It’s hard to send something into space, and NASA learned that over and over again. But that’s why they were unmanned missions: that’s where the kinks were worked out. Some of the twenty unmanned missions tested individual components, like the escape system or the heat shields. Others, especially later on in the project, were tests of whole missions a kind of dry run before sending humans along for the ride. There were also six manned missions in Project Mercury. First came Mercury-Redstone 3, in May 1961, which made Alan Shepard the first American to ever reach space. He was also the first person to ever go to space and then land back on Earth inside the capsule, since the two Soviet cosmonauts who had gone up earlier in 1961 both ejected from their ships and parachuted down to the ground. The third mission was Mercury-Atlas 6, in February 1962. It brought John Glenn into orbit, making him the first American, and the third person in human history, to ever orbit the Earth. You might have noticed that I skipped the second manned mission the one between Shepard’s and Glenn’s flights. That’s because the second and fourth missions of Project Mercury had a very particular purpose: they were duplicates of the previous missions. So Mercury-Redstone 4, with Virgil Grissom on board, was pretty much a carbon copy of Shepard’s flight two months earlier. And Mercury-Atlas 7, with Scott Carpenter on board, was pretty much a carbon copy of Glenn’s orbit. Project Mercury had a lot of scientists working on it who knew that there’s no use doing something once if you can’t prove that you can do it again. And that turned out to be a good idea. After Grissom became the second American in space, his capsule landed in the Atlantic Ocean and pretty much sunk like a rock because the hatch blew open. He got out safely, but the capsule itself wasn’t recovered from the bottom of the ocean until almost forty years later, in 1999. Now, Project Mercury could have stopped after Carpenter’s orbits, but it had two more manned missions to go: Mercury-Atlas 8 and Mercury-Atlas 9. Each orbited for longer than the previous mission had, with Mercury-Atlas 9 orbiting Earth for almost thirty-four hours. This let NASA really nail down that second objective of Project Mercury, which was to see what happened when humans were in low gravity for a long time. They were especially interested in seeing if anything happened to the astronauts’ bodies or brains that would’ve made it hard to put together longer missions like the week-long flight to the Moon that was already in the early planning stages. And what they found was encouraging: being in space for a few days didn’t seem to affect an astronaut’s health or brain very much. L. Gordon Cooper, the astronaut on board, was just as good a pilot after a day and a half in space. Project Mercury also taught NASA how to effectively put together a series of missions that built on one another, and they learned how to train astronauts so that they could succeed in their missions. So not only did America’s first manned space program get us to space it set the stage for all our future space programs, too. Thank you for watching this episode of SciShow Space, and thanks especially to our patrons on Patreon who help make this show possible. If you want to help us keep making episodes like this, just go to to learn more. And don’t forget to go to and subscribe!



Position Astronaut
Pilot Virgil I. Grissom
First spaceflight

Backup crew

Position Astronaut
Pilot John Glenn

Mission parameters

  • Mass: 1 286 kg
  • Maximum altitude: 190.39 km
  • Range: 486.15 km
  • Launch vehicle: Redstone rocket


The Liberty Bell 7 spacecraft, Mercury spacecraft #11, was designated to fly the second manned suborbital flight in October 1960. It came off McDonnell's St. Louis production line in May 1960. Liberty Bell 7 was the first Mercury operational spacecraft with a centerline window instead of two portholes. It was closer to the final orbital version than was Alan Shepard's Freedom 7. Dubbed Liberty Bell 7, it featured a white, diagonal, irregular paint stripe starting at the base of the capsule and extending about two-thirds toward the nose, emulating the crack in the famed Liberty Bell in Philadelphia, Pennsylvania.

Explosive hatch

MR-4 Explosive Hatch Diagram. (NASA)
MR-4 Explosive Hatch Diagram. (NASA)

Liberty Bell 7 also had a new explosive hatch release. This would allow an astronaut to exit the spacecraft quickly in the event of an emergency. Emergency personnel could also trigger the explosive hatch from outside the spacecraft by pulling on an external lanyard. Both the pop-off hatch and the lanyard are standard features of ejection seats used in military aircraft, but in the Mercury design, the pilot still had to exit the craft himself, or be removed by emergency personnel. The original exit procedure was to climb out through the antenna compartment, after removing a small pressure bulkhead. This was a difficult and slow procedure. Removal of an injured or unconscious astronaut through the top hatch would be nearly impossible. The original side hatch was bolted shut with 70 bolts and covered with several spacecraft shingles, making it a slow process to open the original hatch.

McDonnell Aircraft engineers devised two different quick release hatches for the Mercury spacecraft. The first had a latch, and was used on Ham's (a chimpanzee) MR-2 and Shepard's MR-3 missions. The second design was an explosive release hatch. The quick release latching hatch weighed 69 lb (31 kg), too much of a weight addition to use on the orbital version of the spacecraft. The explosive hatch design used the 70 bolts of the original design, but each quarter-inch (6.35 mm) titanium bolt had a 0.06 in (1.5 mm) hole bored into it to provide a weak point. A mild detonating fuse (MDF) was installed in a channel between the inner and outer seal around the periphery of the hatch. When the MDF was ignited, the resulting gas pressure between the inner and outer seal would cause the bolts to fail in tension.

There were two ways to fire the explosive hatch during recovery. On the inside of the hatch was a knobbed plunger. The pilot could remove a pin and press the plunger with a force of 5 or 6 lbf (25 N). This would detonate the explosive charge, which would shear off the 70 bolts and propel the hatch 25 ft (7.6 m) away in one second. If the pin was left in place, a force of 40 lbf (180 N) was required to detonate the bolts. An outside rescuer could blow open the hatch by removing a small panel near the hatch and pulling a lanyard. The explosive hatch weighed 23 lb (10 kg).


The new trapezoidal window on Liberty Bell 7 replaced the two 10 in (250 mm) side portholes that were on Freedom 7. The Corning Glass Works of Corning, New York designed and developed the multilayered panes that comprised the new window. The outer pane was 0.35 in (8.9 mm) thick Vycor glass. It could withstand temperatures of 1,500 to 1,800 °F (820 to 980 °C). The inner pane was made of three inner glass panels bonded to form a single inner pane. One panel was a 0.17 in (4.3 mm) thick sheet of Vycor, while the others were tempered glass. This new window assembly was as strong as any part of the spacecraft pressure vessel.


The manual controls of Liberty Bell 7 incorporated a new rate stabilization control system. This allowed fine control of spacecraft attitude movements by small turns of the hand controller. Previously a lot of jockeying of the device was needed to maintain the desired attitude. This rate damping, or rate augmentation system, gave finer and easier handling qualities and a redundant means of firing the pitch, yaw, and roll thrusters.

Before the Mercury-Redstone 4 mission, Lewis Research Center and Space Task Group engineers had determined that firing the posigrade rockets into the booster-spacecraft adapter, rather than in the open, developed 78 percent greater thrust. This achieved a greater spacecraft-booster separation through a kind of "pop-gun" effect. By using this technique, the spacecraft separated at velocity of about 28.1 ft/s (8.6 m/s) rather than 15 ft/s (4.6 m/s) using the old procedure. The Mercury-Redstone 4/Liberty Bell 7 mission would take advantage of this new procedure.

Additional hardware changes to Liberty Bell 7 were a redesigned fairing for the spacecraft-Redstone adapter clamp-ring and additional foam padding added to the head area of the contour couch. The fairing changes and additional foam were used to reduce vibrations the pilot experienced during the boost phase of flight. The spacecraft instrument panel was rearranged to provide a better eye scan pattern.

Mission description

In January 1961, NASA's Director of the Space Task Group, Robert Gilruth, told Gus Grissom that he would be the primary pilot for Mercury 4. John Glenn was the backup pilot for the mission.

Redstone launch vehicle MRLV-8 arrived at Cape Canaveral on June 8, 1961. A mission review on July 15, 1961, pronounced Redstone MRLV-8 and Mercury spacecraft #11 ready to go for the Mercury 4 mission.

Also, on July 15, 1961, Gus Grissom announced he would name Mercury 4, Liberty Bell 7. Grissom said the name was an appropriate call-sign for the bell-shaped spacecraft. He also said the name was synonymous with "freedom". As a tribute to the original Liberty Bell, a "crack" was painted on the side of the spacecraft.

The Mercury 4 mission was planned as a repeat of MR-3. It was to reach an apogee of 116 mi (187 km). The planned range was 299 mi (481 km). Grissom would experience a maximum acceleration of 6.33 g (62 m/s2) and deceleration of 10.96 g (107 m/s2).

The launch of Liberty Bell 7 was first planned for July 16. The cloud cover was too thick and the launch was postponed until July 18. On July 18, it was again postponed due to weather. Both times, the pilot had not yet boarded the spacecraft. On July 19, 1961, Grissom was on board when the flight was delayed again due to weather. At that point, it had just 10 minutes 30 seconds to go before launch.

On the morning of July 21, 1961, Gus Grissom entered the Liberty Bell 7 at 8:58 UTC and the 70 hatch bolts were put in place. At 45 minutes prior to the scheduled launch, a pad technician discovered that one of the hatch bolts was misaligned. During a 30-minute hold that was called, McDonnell and NASA Space Task Group engineers decided that the 69 remaining bolts should be sufficient to hold the hatch in place and blow it at the appropriate time. The misaligned bolt was not replaced.

Liberty Bell 7 was launched at 12:20:36 UTC, July 21, 1961.


Launch of Mercury-Redstone 4
Launch of Mercury-Redstone 4

Grissom later admitted at the postflight debriefing that he was "a bit scared" at liftoff, but he added that he soon gained confidence along with the acceleration increase. Hearing the engine roar at the pedestal, he thought that his elapsed-time clock had started late. Like Shepard, he was amazed at the smooth quality of the liftoff, but then he noticed gradually more severe vibrations. These were never violent enough to impair his vision.

Grissom's cabin pressure sealed off at the proper altitude, about 27,000 ft (8.2 km), and he felt elated that the environmental control system was in good working order. The suit and cabin temperatures, respectively about 57.5 and 97 °F (14.2 and 36.1 °C) were quite comfortable. Watching his instruments for the pitch rate of the Redstone, Grissom saw it follow directions as programmed, tilting over at about one deg/s.

During a 3 g (29 m/s2) acceleration on the up-leg of his flight, Grissom noticed a sudden change in the color of the horizon from light blue to jet black. His attention was distracted by the noise of the tower-jettison rocket firing on schedule. Grissom felt the separation, and he watched the tower through the window as it drifted off, trailing smoke, to his right. At two minutes and 22 seconds after launch, the Redstone's Rocketdyne engine cut off after building a speed of 6,561 ft/s (2,000 m/s). Grissom had a strong sensation of tumbling during the transition from high to zero acceleration, and, while he had become familiar with this sensation in centrifuge training, for a moment he lost his bearings.

The Redstone coasted for 10 seconds after its engine cut off; then a sharp report signaled that the posigrade rockets were popping the spacecraft loose from the booster. Although Grissom peered out his window throughout his ship's turnaround maneuver, he never caught sight of his booster.

Ballistic flight

With turnaround accomplished, the Air Force jet pilot for the first time became a space pilot, assuming manual-proportional control. A constant urge to look out the window made concentrating on his control tasks difficult. He told Shepard back in Mercury Control that the panorama of Earth's horizon, presenting an 800 mi (1,300 km)[clarification needed] arc at peak altitude, was fascinating. His instruments rated a poor second to the spectacle below.

Turning reluctantly to his dials and control stick, Grissom made a pitch movement change, but was past his desired mark. He jockeyed the handcontroller stick for position, trying to damp out all oscillations, then made a yaw movement and went too far in that direction. By the time the proper attitude was attained, the short time allocated for these maneuvers had been used, so he omitted the roll movement altogether. Grissom found the manual controls very sluggish when compared to the Mercury procedures trainer. He then switched to the new rate command control system and found perfect response, although fuel consumption was high.

After the pitch and yaw maneuvers, Grissom made a roll-over movement so he could see the ground from his window. Some land beneath the clouds (later determined to be western Florida around the Apalachicola area) appeared in the hazy distance, but the pilot was unable to identify it. Suddenly Cape Canaveral came into view so clearly that Grissom found it hard to believe that his slant-range was over 150 mi (240 km).[clarification needed]

He saw Merritt Island, the Banana River, the Indian River, and what appeared to be a large airport runway. South of Cape Canaveral, he saw what he believed to be West Palm Beach.


With Liberty Bell 7 at an altitude of 118.26 mi (190.32 km), it was now time to position the spacecraft in its reentry attitude. Grissom had initiated the retrorocket sequence and the spacecraft was arcing downward. His pulse reached 171 beats per minute. Retrofire gave him the distinct and peculiar feeling that he had reversed his backward flight through space and was actually moving face forward. As he plummeted downward, he saw what appeared to be two of the spent retrorockets pass across the periscope view after the retrorocket package had been jettisoned.

Pitching the spacecraft over into a reentry attitude of 14 degrees from Earth-vertical, the pilot tried to see the stars out his observation window. Instead the glare of sunlight filled his cabin, making it difficult to read the panel dials, particularly those with blue lights. Grissom thought that he would not have noticed the 0.05 g (0.5 m/s2) light if he had not known it was about to flash on.

Reentry presented no problem. Grissom could not feel the oscillations following the acceleration buildup; he could only read them on the rate indicators. Meanwhile, he continued to report to the Mercury Control Center on his electric current reading, fuel quantity, acceleration, and other instrument indications. Condensation and smoke trailed off the heatshield at about 65,000 ft (20 km) as Liberty Bell 7 plunged back into the atmosphere.

The drogue parachute deployed on schedule at 21,000 ft (6.4 km). Grissom said he saw the deployment and felt some resulting pulsating motion, but not enough to worry him. Main parachute deployment occurred at 12,300 ft (3.7 km), which was about 1,000 ft (300 m) higher than the design nominal altitude. Watching the main chute unfurl, Grissom spotted a 6 in (150 mm) L-shaped tear and another 2 in (51 mm) puncture in the canopy. Although he worried about them, the holes grew no bigger and his rate of descent soon slowed to about 28 ft/s (8.5 m/s). Dumping his peroxide control fuel, the pilot began transmitting his panel readings.


A "clunk" confirmed that the landing bag had dropped in preparation for impact. Grissom then removed his oxygen hose and opened his visor, but deliberately left the suit ventilation hose attached. Impact was milder than he had expected, although the spacecraft heeled over in the water until Grissom was lying on his left side. He thought he was facing downward. The spacecraft gradually righted itself, and, as the window cleared the water, Grissom jettisoned the reserve parachute and activated the rescue aids switch. Liberty Bell 7 still appeared to be watertight, although it was rolling badly with the swells.

Preparing for recovery, he disconnected his helmet and checked himself for debarkation. The neck dam did not unroll easily; Grissom tinkered with his suit collar to ensure his buoyancy in the event that he had to get out of the spacecraft quickly. When the recovery helicopters, which had taken to the air at launch time and visually followed the contrails and parachute descent, were still about 2 mi (3.2 km) from the impact point, which was only 3 mi (4.8 km) beyond the bullseye, Lieutenant James L. Lewis, the pilot of the primary recovery helicopter, radioed Grissom to ask if he was ready for pickup. He replied that he wanted them to wait five minutes while he recorded his cockpit panel data. Using a grease pencil with the pressure suit gloves was awkward, and several times the suit ventilation caused the neck dam to balloon, but Grissom simply placed his finger between neck and dam to allow the air to escape.

Hatch blows open

Grissom is hoisted to safety following the sinking of Liberty Bell 7
Grissom is hoisted to safety following the sinking of Liberty Bell 7

After logging the panel data, Grissom asked the helicopters to begin the approach for pickup. He removed the pin from the hatch-cover detonator and lay back in the couch. "I was lying there, minding my own business," he said afterward, "when I heard a dull thud." The hatch cover blew away, and salt water swished into the spacecraft as it bobbed in the ocean. The capsule began taking on water and was sinking fast.

Grissom had difficulty recollecting his actions at this point, but he was certain that he had not touched the hatch-activation plunger. He had earlier unbuckled himself from most of his harness; he now removed his helmet, grasped the instrument panel with his right hand, and climbed though the hatchway.

The copilot of the nearest recovery helicopter said that as he was preparing, per procedure, to cut off the spacecraft's antenna whip with a squib-actuated cutter at the end of a pole, the hatch cover flew off, struck the water about 5 ft (1.5 m) away, then skipped over the waves. Next he saw Grissom climb through the hatch and swim away.

Failed spacecraft recovery

HUS-1 helicopter attempting to recover the Liberty Bell 7 spacecraft. The recovery ship USS Randolph is visible in the distance.
HUS-1 helicopter attempting to recover the Liberty Bell 7 spacecraft. The recovery ship USS Randolph is visible in the distance.

Leaving aside the swimming astronaut, Lewis completed his approach to the sinking spacecraft, as both he and Reinhard were intent on spacecraft recovery. This action was a conditioned reflex based on past training experience. While training off the Virginia beaches the helicopter pilots had noted that the astronauts seemed at home in and to enjoy the water. So Reinhard quickly cut the high-frequency antenna as soon as the helicopter reached Liberty Bell 7. Throwing aside the antenna cutting device, Reinhard picked up the shepherd's-hook recovery pole and carefully threaded the crook through the recovery loop on top of the spacecraft. By this time Lewis had lowered the helicopter to assist Reinhard in his task to a point that the helicopter's three wheels were in the water. The capsule sank out of sight, but the pickup pole tangled as the attached cable went taut, indicating to the helicopter pilots that they had made the catch.

Reinhard immediately prepared to pass the floating astronaut the personnel hoist, but at that moment Lewis called a warning that a detector light had flashed on the instrument panel, indicating that metal chips were in the oil sump because of engine strain. Considering the implication of impending engine failure, Lewis told Reinhard to retract the personnel hoist while he called the second helicopter to retrieve Grissom.

Meanwhile, Grissom, having made certain that he was not snared by any lines, noticed that the primary helicopter was having trouble raising the submerged spacecraft. He swam back to the spacecraft to see if he could assist, but found the cable properly attached. When he looked up for the personnel line, he saw the helicopter start to move away.

Suddenly, Grissom realized that he was not riding as high in the water as he had been. All the time he had been in the water he kept feeling air escape through the neck dam. The more air he lost, the less buoyancy he had. Moreover, he had forgotten to secure his suit inlet valve. Swimming was becoming difficult, and now with the second helicopter moving in he found the rotor wash between the two aircraft was making swimming more difficult. Bobbing under the waves, Grissom was scared, angry, and looking for a swimmer from one of the helicopters to help him tread water. Then he caught sight of a familiar face, that of George Cox, aboard the second helicopter. Cox was the copilot who had retrieved both the chimpanzee Ham and Shepard on the first Mercury flight. With his head barely above water, Grissom found the sight of Cox heartening.

Cox tossed the "horse-collar" lifeline straight to Grissom, who immediately wrapped himself into the sling backwards. Lack of orthodoxy mattered little to Grissom now, for he was on his way to the safety of the helicopter, even though swells dunked him twice more before he got aboard. His first thought was to get a life preserver on. Grissom had been either swimming or floating for a period of only four or five minutes, "although it seemed like an eternity to me," as he said afterward.

As the first helicopter moved away from Grissom, it struggled to raise the spacecraft high enough to drain the water from the impact bag. At one point the spacecraft was almost clear of the water, but like an anchor it prevented the helicopter from moving forward. The flooded capsule weighed over 5,000 pounds (2,300 kg), 1,000 lb (450 kg) beyond the helicopter's lifting capacity. The pilot, watching his insistent red warning light, decided not to chance losing two craft in one day. He finally cast loose, allowing the spacecraft to sink swiftly. Martin Byrnes, aboard the carrier, suggested that a marker be placed at the point so that the spacecraft might be recovered later. Rear Admiral J. E. Clark advised Byrnes that in that area the depth was about 2,800 fathoms (5.1 km; 16,800 ft; 3.2 mi).


Substantial controversy ensued, as Grissom reported that the hatch had blown prematurely without his authorization. An independent technical review of the incident between August and October 1961 raised doubts regarding the theory that Grissom had blown the hatch and was responsible for the loss of the spacecraft.[2] There is strong evidence that the Astronaut Office did not accept Grissom's guilt in the fact that he was maintained in the prime rotation spot for future flights, commanding the first Gemini flight, and the first planned Apollo flight.[2]

Three Mercury flights later, Astronaut Wally Schirra manually blew Sigma 7's hatch after recovery when his spacecraft was on the deck of the recovery ship, in a deliberate attempt to dispel the rumor that Grissom might have blown the capsule's hatch deliberately. As anticipated, the kickback from the manual trigger left Schirra with a visible injury to his right hand. Grissom was uninjured when he exited the spacecraft, as documented by his postflight physical. This strongly supports his assertion that he did not "accidentally" hit the trigger, since in that case he would have been even more likely to injure himself than with intentional activation.[3]

In a 1965 interview, Grissom said that he believed the external release lanyard came loose, triggering the hatch release. On the Liberty Bell 7, this release lanyard was held in place by only one screw. This theory was accepted by Guenter Wendt, the Pad Leader for most early American manned spaceflights.[4]

During a launch simulation on Apollo 1 in 1967, the combination of a cabin fire and an inward opening hatch contributed to the death of Grissom, as well as that of the astronauts Ed White and Roger B. Chaffee in a launch-pad fire. Use of an explosive hatch had been rejected following the discovery by engineers that, in fact, an explosive egress system on a spacecraft could inadvertently fire without being triggered. Following the Apollo fire, Block II Apollo spacecraft were equipped with rapid-opening systems.

Recovery of Liberty Bell 7

Liberty Bell 7 was recovered in 1999
Liberty Bell 7 was recovered in 1999
The restored spacecraft is currently displayed at the Cosmosphere in Hutchinson, Kansas.
The restored spacecraft is currently displayed at the Cosmosphere in Hutchinson, Kansas.

After several unsuccessful attempts in 1992 and 1993, Oceaneering International, Inc. lifted the Liberty Bell 7 off the floor of the Atlantic Ocean and onto the deck of a recovery ship on July 20, 1999, the 30th anniversary of the Apollo 11 lunar landing.[5] The team was led by Curt Newport and financed by the Discovery Channel. The spacecraft was found after a 14-year effort by Newport at a depth of nearly 16,000 ft (4,900 m),[6] 300 nmi (350 mi; 560 km) east-southeast of Cape Canaveral.[7] Among the items found within were part of the flight gear and several Mercury head dimes which were taken to space to be souvenirs of the flight.[5]

After Liberty Bell 7 was secured on the deck of the recovery ship, the "Ocean Project", experts removed and disposed of an explosive device (SOFAR bomb) that was supposed to detonate in the event of the spacecraft's sinking, but which failed to explode.[8] The spacecraft was then placed in a container filled with seawater to prevent further corrosion. The Cosmosphere, in Hutchinson, Kansas, disassembled and cleaned the spacecraft,[9] and it was released for a national tour through September 15, 2006. The spacecraft was then returned to the Cosmosphere where it is on permanent display. In 2016, it was temporarily lent to The Children's Museum of Indianapolis.[10]

Dramatization in film

Philip Kaufman's 1983 film The Right Stuff includes a dramatization of the Liberty Bell 7 mission in which Fred Ward played Gus Grissom.[11]


T+ Time Event Description
T+00:00:00 Liftoff Mercury-Redstone lifts off, onboard clock starts.
T+00:00:16 Pitch Program Redstone pitches over 2 deg/s from 90 deg to 45 deg.
T+00:00:40 End Pitch Program Redstone reaches 45 deg pitch.
T+00:01:24 Max Q Maximum dynamic pressure ~575 lbf/ft² (28 kPa).
T+00:02:20 BECO Redstone engine shutdown - Booster Engine Cutoff. Velocity 5,200 mph (2.3 km/s)
T+00:02:22 Tower Jettison Escape Tower Jettison, no longer needed.
T+00:02:24 Spacecraft Separation Posigrade rockets fire for 1 s giving 15 ft/s (4.6 m/s) separation.
T+00:02:35 Turnaround Maneuver Spacecraft (ASCS Automatic Stabilization and Control System) system rotates spacecraft 180 deg, to heat shield forward attitude. Nose is pitched down 34 deg to retro fire position.
T+00:05:00 Apogee Apogee of about 115 mi (185 km) reached at 150 mi (240 km) downrange from launch site.
T+00:05:15 Retrofire Three retro rockets fire for 10 s each. They are started at 5 s intervals, firing overlaps. Delta-V of 550 ft/s (170 m/s) is taken off forward velocity.
T+00:05:45 Retract Periscope Periscope is automatically retracted in preparation for reentry.
T+00:06:15 Retro Pack Jettison One minute after retrofire retro pack is jettisoned, leaving heatshield clear.
T+00:06:20 Retro Attitude Maneuver (ASCS) orients spacecraft in 34 deg nose down pitch, 0 deg roll, 0 deg yaw.
T+00:07:15 .05 g Maneuver (ASCS) detects beginning of reentry and rolls spacecraft at 10 deg/s to stabilize spacecraft during reentry.
T+00:09:38 Drogue Parachute Deploy Drogue parachute deployed at 22,000 ft (6.7 km) slowing descent to 365 ft/s (111 m/s) and stabilizing spacecraft.
T+00:09:45 Snorkel Deploy Fresh air snorkel deploys at 20,000 ft (6.1 km). (ECS) switches to emergency oxygen rate to cool cabin.
T+00:10:15 Main Parachute Deploy Main parachute deploys at 10,000 ft (3.0 km). Descent rate slows to 30 ft/s (9.1 m/s)
T+00:10:20 Landing Bag Deploy Landing Bag Deploys, dropping heat shield down 4 ft (1.2 m).
T+00:10:20 Fuel Dump Remaining hydrogen peroxide fuel automatically dumped.
T+00:15:30 Splashdown Spacecraft lands in water about 300 mi (480 km) downrange from launch site.
T+00:15:30 Rescue Aids Deploy Rescue aid package deployed. The package includes green dye marker, recovery radio beacon and whip antenna.

See also


  1. ^ "Results Of The Second U.S. Manned Suborbital Spaceflight July 21, 1961 (NASA)" (PDF). NASA. 1961.
  2. ^ a b Ben Evans (April 2, 2010). Escaping the Bonds of Earth: The Fifties and the Sixties. Springer Science & Business Media. pp. 107–. ISBN 978-0-387-79094-7.
  3. ^ French, F.; Burgess, C. (2007). Into That Silent Sea: Trailblazers of the Space Era, 1961-1965, Lincoln: University of Nebraska Press (ISBN 978-0-8032-1146-9), 93
  4. ^ John Bisney; J. L. Pickering (April 25, 2016). Spaceshots and Snapshots of Projects Mercury and Gemini: A Rare Photographic History. University of New Mexico Press. pp. 15–. ISBN 978-0-8263-5263-7.
  5. ^ a b Joseph A. Angelo (May 14, 2014). Human Spaceflight. Infobase Publishing. pp. 87–. ISBN 978-1-4381-0891-9.
  6. ^ Ocean News & Technology. Technology Systems Corporation.
  7. ^ Air & Space Smithsonian. Smithsonian Institution. 2000.
  8. ^ Materials Performance. National Association of Corrosion Engineers. July 1999.
  9. ^ Robert Greenberger (October 1, 2003). Gus Grissom: The Tragedy of Apollo 1. The Rosen Publishing Group. pp. 54–. ISBN 978-0-8239-4458-3.
  10. ^ "The Liberty Bell 7 Recovery". Blacksburg, Virginia: UXB. 2011. Archived from the original on March 18, 2013. Retrieved 2013-03-18.
  11. ^ Emmis Communications (October 2000). Indianapolis Monthly. Emmis Communications. pp. 102–. ISSN 0899-0328.


 This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.

External links

This page was last edited on 8 December 2018, at 23:58
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.