Photo courtesy NASA

Note: This week’s interesting ships are reposted and updated from gCaptain’s archives in commemoration of the last space shuttle launch today, July 8th, 2011.

When one thinks of a NASA ship, it’s generally not the seagoing type that pops into ones head.  However, NASA does in fact have two vessels made for the high seas – MV Liberty Star and the MV Freedom Star – that assist with a shuttle launch.  Both vessels are tasked as recovery ships for retrieving spent Solid Rocket Boosters (SRBs) that are used to power the shuttle’s ascent into space.  After two minutes of flight, the boosters separate from the orbiter and external tank at an altitude of approximately 24 miles, descend under parachutes and land in the Atlantic Ocean where the MV Liberty Star and the MV Freedom Star are waiting to retrieve the reusable SRB’s.

It all begins about 24 hours before a shuttle launch, when the two ships set out to sea, manned by highly trained crews of professional merchant mariners and divers. During the operation, each ship retrieves one booster. Each ship has a permanently assigned crew of 10: a captain, two mates, four seamen, two marine engineers and a cook. In addition, eight divers accompany each crew to perform the delicate retrieval operation.

Here is an image taken from from the May 2008 STS-124 mission of an SRB splashing down into the ocean.

Once the boosters splash down into the ocean, the recovery ships spring into action:

First the pilot chutes and main parachutes are brought aboard. They’re followed by the drogue parachute and the 5,000-pound frustum that houses the chutes at the top of the booster. With those elements secured onboard, attention turns to the booster itself, as a team of eight divers boards two small boats.  After installing a 1,500-pound apparatus called an “enhanced diver-operated plug” and air hose, the water is removed from the booster. The booster then rises in the water until it falls horizontally and floats on the surface, enabling the ship to tow it back to port behind the vessel.

Once recovered, the boosters are refurbished and reused in future shuttle launches, and the MV Liberty Star and the MV Freedom Star take on additional duties such as assist with diver training for NOAA and the Navy and additional utility uses.  As to where they go now that the last space shuttle has launched?  We’re not sure.

The Liberty Star and Freedom Star were specifically designed and constructed for this task. Built at Atlantic Marine Shipyard, Fort George Island, near Jacksonville, Fla., in 1980 and 1981, the ships are 53.6 meters (176 feet) in length, 14.3 meters (37 feet) in width and draw 3-4 meters (10-12 feet) of water.

A good article on the SRB retrieval mission has just been posted to the NASA website HERE.

LINKS:

More images can be found HERE and HERE

Freedom and Liberty Go to Sea

Behind the Scenes : Processing SRBs

Our favorite competitor in professional mariner news, Marine-Buzz.com, recently had an exceptional post on maritime technology used to launch rockets into space. 

Having seen ships being used as a Hospital, University, Museum, promoting fashion, its time now to see a ship being used as a Platform to launch satellites. Sea Launch is preparing to launch a Zenit-3SL rocket with a Thuraya-3 communication satellite shortly from a floating platform in the Pacific Ocean. To view live web telecast click here.

The Sea Launch is the world’s first ever commercial international project to develop and operate a sea-based space launch system. The main objective of this project is to launch satellites from a mobile sea-based launch platform.

The key advantages of the Sea Launch system over ground launch sites are as follows:

• Ability to launch directly from the equator thus reducing unit costs of their delivery to the target orbit.
• Ability to launch with any azimuth from open sea, thus making launches free of political risks.
• Compactness, no need to have a well-developed ground infrastructure and its associated social support (roads, power, hotels, schools, hospitals, etc.), which radically reduces the numbers of personnel participating in the work, and, therefore, the cost of operation.
• Ability to process spacecraft for launch on the US territory (Long Beach, CA), virtually in an “urban” environment.

Being the closest marine technology company to gCaptain HQ, Sea Launch is a company that interests us greatly… we only wish we had gotten to the story sooner!

You can find MarineBuzz’s exhaustive review of SeaLaunch technology including additional photos HERE.