this was published Sept 22 news, and now approaching the expected time for version 2
W2 Energy built and delivered Generation 1 of its AiRocket compressed air engine to the Arizona Research Institute for Solar Energy (AzRISE) at the University of Arizona in Tucson, and is currently building Generation 2 of the AiRocket for AzRISE to replace Generation 1. Estimated delivery to AzRISE is November 15th, 2011.