Lunar Lander, Surveyor, T-21 Prototype

Built as a full scale engineering thermal control model. Is missing the solid-fuel retro rocket that was on the other surveyor craft that were launched. Triangular space frame constructed of thin walled aluminum tubing. A hydraulic shock absorber-equipped landing leg is hinged to each of the three lower corners; the legs terminate in circular crushable aluminum honeycomb footpads. A tubular mast at the apex of the frame supports a rectangular solar panel and a square high gain antenna. Two tubular booms attached to the frame end in small, conical, low gain antennas. A selection of instrument boxes, vernier rocket and their fuel containers, and the TV camera are attached to the periphery of the frame. A long scissors-jack like arm that works the soil mechanics sample scoop is hinged horizontally and vertically to the frame." (Artifact Documentation Worksheet Cat#: 19700294).