sts-75

STS-75 was a United States Space Shuttle mission, the 19th mission of the Columbia orbiter.
The primary objective of STS-75 was to carry the Tethered Satellite System Reflight (TSS-1R) into orbit and to deploy it spaceward on a conducting tether. The mission also flew the United States Microgravity Payload (USMP-3) designed to investigate materials science and condensed matter physics.

Shuttle mission STS-75 will be flying a number of microgravity experiments developed by the NASA Lewis Research Center (LeRC) Space Experiments Division (SED) on February 22, 1996. The mission will be the third United States Microgravity Payload (USMP-3) to conduct microgravity research to improve our understanding of materials science and condensed matter physics. In addition, NASA LeRC developed three combustion experiments for the Middeck Glovebox Facility (MGBX).

The objectives of CSD were to examine how particulates form from a variety of sources and to quantify the performance of several diagnostic techniques. The sources tested included four overheated materials (paper, silicone rubber, Teflon-coated (DuPont) wire, and Kapton-coated (DuPont) wires), each tested at three heating rates, and a candle tested at three air velocities. Paper, silicone rubber, and wire insulation, materials found in spacecraft crew cabins, were selected because of their different smoke properties. The candle yielded hydrocarbon soot typical of many 1g flames. Four diagnostic techniques were employed: thermophoretic sampling collected particulates for size analysis; laser light extinction measurements near the source tallied total particulate production; and laser light scattering and ionization detector measurements far from the particulate source provided data for evaluating the performance of smoke detection systems for these particulate sources. 
This experiment was conducted aboard the Space Shuttle Columbia during flight STS-75 of the third United States Microgravity Payload (USMP-3) mission.

Payload with USMP Flown on STS-94 STS-32 STS-62 STS-75 STS-89

The objectives of the FFFT experiment are to identify the effect of low-speed flow and bulk fuel temperature on the flammability,
ignition, flame growth, and flame spreading behavior of solid fuels in a micro-g environment.