ARCA's Haas 2CA Single Stage to Orbit (SSTO) rocket uses a linear aerospike engine. The aerospike engine was extensively tested on the ground by NASA and Rocketdyne and it was a strong contender for the Space Shuttle. It was also part of NASA’s VentureStar, a Single Stage to Orbit vehicle. Due to schedule and budget constraints, the Space Shuttle received a classic bell shaped nozzle engine and the VentureStar was canceled before getting to see an actual flight. Therefore the aerospike engine never saw a space flight to this day. In March 2017 however, ARCA Space Corporation brought this technology back to the public’s attention, by introducing the Haas 2CA Single Stage to Orbit rocket, equipped with the Executor Aerospike linear rocket engine. Since the successful development of the Launch Assist System, ARCA is committed to build an orbital launcher as clean as possible. For the first orbital flight, the Haas 2CA rocket weighting more than 16 tons at launch, will use the LAS 25R as first stage, reducing it’s polluting propellant mass from 16 to only 4 tons. Haas 2CA will operate on the nano/micro satellites market which is based on a SpaceWorks and Eurostat forecast indicating 3,000 satellites between 1- 50kg will require a launch between 2016-2022. The total market value is estimated to be $5.3 billion in the next decade. At $1,000,000/launch the Haas 2CA perfectly fits into this market seeking economical solutions. The Haas 2CA is the development base for the whole Haas rocket series.