[quote name='vasu_ray' date='12 September 2010 - 03:00 AM' timestamp='1284240155' post='108252']
Assuming purpoising trajectory is due to alternating between 20sec bursts of thrust (climbing) followed by coasting (diving) at hypersonic velocity, what are the mach numbers associated with altitude?
specifically if mach nos required at 40km altitude to fly hypersonic are different from those required at 100km?
[/quote]
Mach number is in the same rather limited range of 5-8 M for which engine is optimized for thrusting phase; at 100 km there is no useful air density for lift or engine.
Assuming purpoising trajectory is due to alternating between 20sec bursts of thrust (climbing) followed by coasting (diving) at hypersonic velocity, what are the mach numbers associated with altitude?
specifically if mach nos required at 40km altitude to fly hypersonic are different from those required at 100km?
[/quote]
Mach number is in the same rather limited range of 5-8 M for which engine is optimized for thrusting phase; at 100 km there is no useful air density for lift or engine.