Roger Racine writes:
> At 02:01 PM 11/3/2000 , [log in to unmask] wrote:
> >NASA's page on the recently tested X-38 crew return vehicle
> >(http://www.dfrc.nasa.gov/PAO/PAIS/HTML/FS-038-DFRC.html) contains the
> >following statement:
> >"The X-38 flight computer is commercial equipment that is currently used
> >in aircraft, and the flight software operating system is a commercial system
> >already in use in many aerospace applications."
> >Does anyone on this list have more details on the X-38 software that they
> >can share?
> >F. Britt Snodgrass
> VxWorks OS, application software is written in C.
> Roger Racine
Date: Mon, 6 Nov 1972 16:46:10 -0500 (EST)
From: "James H. Paul" <[log in to unmask]>
Subject: Unplanned roll in NASA's X-38
*Aviation Week & Space Technology*, 6 Nov 2000, p. 24
"NASA's X-38 Vehicle 131R did a slow, 360-deg. roll after release from its
B-52 carrier aircraft on Nov. 2. It was the first free flight of the
vehicle, which automatically stabilized under the preprogrammed deployment
of a drogue chute and made a successful landing under parafoil on a dry
lakebed runway, as scheduled, at Edwards AFB, Calif. The vehicle sustained
no damage in the test. Project officials said they would have to do some
trouble-shooting to figure out why the Crew Return Vehicle (CRV) prototype
rolled at an estimated average rate of about 20 deg. per sec. during its 24
sec. of scheduled free flight. A software problem in the vehicle's flight
control system was suspected, although project officials were also looking
at whether aerodynamic disturbances immediately after separation might have
played a role. Actual separation from the B-52 was clean, and the flight
control system maintained angle of attack throughout the 18-sec. roll. The
vehicle is an 80%-scale version of the CRV designed to provide emergency
escape for International Space Station crews."