Skip to main content

David S F Portree

The Moon and Beyond: A 1963 Plan to Expand NASA's Robotic Exploration Programs

Aug 16, 2012 12:11 AM

S-IIB Interplanetary Injection Stage For Piloted Mars/Venus Flybys (1968)

Aug 14, 2012 1:13 AM

1977 Apollo-Soyuz Docking Mission Repeat (1974)

Aug 12, 2012 12:33 AM

NASA Tries to PEP Up Shuttle/Spacelab (1981)

Aug 11, 2012 2:13 AM

LM Relay Experiment Laboratory (1966)

Aug 10, 2012 12:22 AM

Mars in 1995! (1980-1981)

Aug 3, 2012 10:04 AM

A Flying Rover: JPL's Mars Airplane (1978)

Aug 1, 2012 12:07 AM

Mars 1984 Rover-Orbiter-Penetrator Mission (1977)

Jul 30, 2012 12:48 AM

Mars Multi-Rover Mission (1977)

Jul 28, 2012 1:54 AM

NASA Marshall's Skylab Reuse Study (1977)

Jul 24, 2012 2:14 AM

Mission to II P 6-1 (1968)

Jul 20, 2012 12:39 AM

Visions of Spaceflight Circa 2001 (1984)

Jul 17, 2012 12:10 AM

Skylab Rescue Plan (1972)

Jul 10, 2012 10:04 PM

Antaeus Orbiting Quarantine Facility (1978)

Jul 7, 2012 11:19 AM

Project FIRE Redux: Interplanetary Reentry Tests (1966)

Jul 5, 2012 12:51 AM

Alternate Apollo 13 (1970)

Jul 2, 2012 12:07 AM

Canceled: Apollo 15 and Apollo 19 (1970)

Jun 28, 2012 1:13 AM

The Last Manned Mars Plan (1971)

Jun 25, 2012 12:45 AM

Capturing a Comet: Giotto II (1985)

Jun 22, 2012 12:49 AM

Abort from Mars & Venus Missions (1970)

Jun 20, 2012 12:20 AM