Technology on September 8, 2022, who continues to operate the company's test vehicles. Xombie Masten's Xombie (model XA-0.1B) won the second prize in the Level One competition of the Lunar Lander Challenge on 7 October 2009 with an average landing accuracy of . The primary goal of these two airframes was to demonstrate stable, controlled flight using a GN&C system developed in-house at Masten. XA-0.1B originally featured four engines with thrust, but was converted in Spring 2009 to be powered by one engine of thrust. By October 2009, the regeneratively cooled isopropyl alcohol and liquid oxygen rocket engine was running at around . XA-0.1B, nicknamed "Xombie", first flew free of tether 19 September 2009, and qualified for the Lunar Lander Challenge Level One second prize of $150,000 on 7 October 2009. In October 2016, NASA reported using Xombie to test the Landing Vision System (LVS), as part of the Autonomous Descent and Ascent Powered-flight Testbed (ADAPT) experimental technologies, for the Mars 2020 mission landing. , Xombie had flown 224 times. Xoie Masten's Xoie (model XA-0.1E) won the Level Two prize of the Lunar Lander Challenge on October 30, 2009. They beat Armadillo Aerospace by just a bit more than of total landing accuracy, with an average accuracy of about on the two landings in the round-trip competition flight. Xoie had an aluminum frame and featured a version of Masten's thrust engine that produced around of thrust. "Xoie", as the craft was nicknamed, qualified for the Lunar Lander Challenge level two on October 30, 2009. Xaero The Xaero reusable launch vehicle was a vertical-takeoff, vertical-landing (VTVL) rocket which was being developed by Masten in 2010–2011. It was proposed to NASA as a potential suborbital reusable launch vehicle (sRLV) for carrying research payloads under NASA's Flight Opportunities Program (initially known as the Commercial Reusable Suborbital Research/CRuSR program), projecting altitude in initial flights of five to six minutes duration, while carrying a research payload. It was propelled by the Cyclops-AL-3 rocket engine burning isopropyl alcohol and liquid oxygen. The first Xaero test vehicle flew 110 test flights before being destroyed in its 111th flight. During the record-setting flight on 11 September 2012, an engine valve stuck open during descent, and this was sensed by the control system. As designed, the flight termination system was triggered, destroying the vehicle before it could create a range safety problem. The final test flight was intended to