The orbital rocket Haas 2C (named after Conrad Haas* (1509-1579), austrian-romanian medieval rocket pioneer, the first stage-rocket creator), will be used by ARCA for the Google Lunar X Prize competition.
The Haas 2 rocket will be launched from the ground, while its smaller variant, the Haas 2, will be attachable under the IAR-111 Excelsior plane.
Haas 2C is a rocket that can reach orbit with a single stage, which is made possible by the large scale use of composite materials for manufacturing the fuel tanks. Haas 2C can place 50kg payloads into orbit and the empty rocket weights 510 kg. The total mass placed into orbit is 560. The thrust to weight ratio of the rocket is 26:1.
For the Google Lunar X Prize competition and for other 400 kg payloads the rocket will have a second stage.
 Haas 2C, SSTO variant. 
Haas 2C, two stages variant: 400 kg to LEO. This two stages variant first flight will be for the Google Lunar X Prize competition.
Situation in June 2012: Program in accelerated development. First flight scheduled for 2013.
* In 1529, Conrad Haas managed to launch, in Sibiu, rockets with two and three stages using black powder. He proposed using delta wings for stabilizing rockets during flight. He worked to develop various fuel compositions. At that time military rockets were his chief concern. He was a career soldier and participated in the Battle of Vienna against the Ottoman Empire in 1542. He also understood the purpose of rockets with civilian aplications. Haas proposed an experiment with an animal on board a rocket. We do not have enough information to say whether this experiment took place.
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