In May 2005 the European Union began funding its €26 million ($35.2
million) Environmentally Friendly High Speed Aircraft, or HISAC, project
that had the same ultimate goal - to discover how to create a business
jet that could halve transatlantic flight times and be environmentally
friendly.
After five years of work, the final HISAC report found that the Sukhoi Civil Aircraft-led Russian team had produced a design that met the environmental objectives. For HISAC three teams evolved classes of concepts that examined different aspects of the technical challenges facing a supersonic business jet. Team C was led by Sukhoi, working with the Central Aerohydrodynamics Institute and Central Institute of Aviation Motors (CIAM), and the others were Dassault's team A and Alenia Aeronautica's B. Continue reading...
Here's the general layout of the low sonic-boom HISAC:
After five years of work, the final HISAC report found that the Sukhoi Civil Aircraft-led Russian team had produced a design that met the environmental objectives. For HISAC three teams evolved classes of concepts that examined different aspects of the technical challenges facing a supersonic business jet. Team C was led by Sukhoi, working with the Central Aerohydrodynamics Institute and Central Institute of Aviation Motors (CIAM), and the others were Dassault's team A and Alenia Aeronautica's B. Continue reading...
Here's the general layout of the low sonic-boom HISAC:

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