Matej said:
These are from interesting critical DLR paper entitled
The Sonic Cruiser – A Concept Analysis
Dr. Martin Hepperle
DLR Institute of Aerodynamics and Flow Technologies, DLR Braunschweig, Germany
Authors used published artist's renderings and a fistful of data that Boeing gave on Cruiser to analyze
"Abstract
Early in 2001 the Boeing company announced a new aircraft, the “Sonic Cruiser”. The most
impressive features of this new project were a range of up to 10’000 nautical miles, a cruise
Mach number above M = 0.95 and the claim of a large reduction in flight time.
A concept level study was undertaken to design and analyze a possible aircraft configuration.
One result of the study is the fact, that the reduction of flight time by increasing the cruise
Mach number to M = 0.98 is relatively small. A larger reduction of travel time seems to be
possible only by using direct point to point services instead of hub and spoke connections.
Another result is, that the claimed range would be very hard to reach."
http://www.dlr.de/as/Portaldata/5/Resources/dokumente/abteilungen/abt_ke/vorentwurf/hepperle-sonic-cruiser-paper.pdf