First HTV-2 to Launch Aboard First Minotaur IV: Air Force and industry personnel are slated to launch today from Vandenberg AFB, Calif., Orbital Sciences Corp.'s first Minotaur IV—an amalgam of three decommissioned Peacekeeper ICBM stages and one built commercially by OSC—in its "Lite" configuration with only the three Peacekeeper stages to boost DARPA's new gliding air vehicle, known as HTV-2 for hypersonic test vehicle-2. Lockheed Martin designed HTV-2 for DARPA to validate technologies needed for hypersonic speeds of Mach 20 and above. DARPA expects the first HTV-2 to separate from the Minotaur in the upper atmosphere, descend into the atmosphere, and glide across the Pacific Ocean at more than 13,000 mph, reaching its impact point in the ocean north of the Kwajalein Atoll in less than 30 minutes.
"Subject to final preparations and favorable weather conditions, the mission will originate from Space Launch Complex-8 at Vandenberg Air Force Base, CA, with its first available launch window from 12:00 p.m. to 5:00 p.m. (PST) tomorrow, April 20, 2010.
For the HTV-2 mission, Orbital will fly a three-stage Minotaur IV ”Lite” version of the rocket to carry out the suborbital flight trajectory. The Minotaur IV will propel the HTV-2 air vehicle into the upper atmosphere, where it will be released. The HTV-2 will then descend at hypersonic speed into the Pacific Ocean near Kwajalein Atoll in the Marshall Islands."