[quote][b][url=/v3/forum/%C3%A9tats-unis-31/topic/sr-71-blackbird-290/?post=9426#post-9426]ex-rogcas[/url] a dit le 11/11/2006 à 23:19 :[/b]

[quote="Tuckson"]Une info sur la séquence d'éjection du D-21 ?[/quote]
Suffit de demander : :wink: 

[i]...When ferrying the D-21, the combination was called an M/D-21.  The D-21 was powered by a Marquardt ramjet engine that had been developed and tested on the unmanned X-7 vehicle.  Ramjets are essentially hollow tubes that use the compression of extremely fast air rushing into the inlet instead of a normal compressor/fan combination like a turbojet.  As a result, the ramjet engine is useless below Mach 1.25...

...The M/D-21 would take off and fly to speeds above Mach 3 and 80,000 feet.  At this speed and altitude, the drone's engine could be ignited and the drone launched from the back of the mothership, to fly along a preprogrammed course, then jettison its camera pack over neutral or friendly territory before self-destructing...

...Prior to this flight, there had been 3 successful D-21 launches from 941, but all 3 had been executed with the mothership in a .9g "dive," flying slightly downward to assist in blackbird/drone separation.  If the still-experimental M/D-21 were to be used in combat (real-world) missions, the crew might be under fire from missiles and fighter/interceptors, and so might not have the luxury of launching from a .9g dive.  In this fourth launch, the D-21 would separate in a level-flight, 1g configuration...[/i]

Source : http://www.habu.org

 :wink:[/quote]