As an example of how airbreathing engines could be used, the
Pogo is intended as the first stage of a
TSTO
or MSTO launch system. Shown here using existing jet engines from the
F-15 it is expected to reach at least Mach 2.5 and 80,000 ft before
releasing a Pegasus-sized vehicle. Jet engines being developed for a
proposed hypersonic commercial transport ("Hypersonic Transport
Propulsion," Aerospace Engineering, June 1996, pp
7-11.) could take a much larger Pogo
to Mach 5 and 100,000 ft. For many payload sizes, low-cost jet engines
can do the job of rockets in the region where rockets are most
expensive and inefficient.
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