<font face="Verdana, Arial, Helvetica" size="2">We reach a critical point at 1.3 Mach. This is where digitally controlled ramps within the engine intake ducts start to drop down. These ramps create a shock wave that slows the air within the intake. At 1.7 Mach, the ramps are so efficient that we pull the engine out of afterburner and Concorde continues to accelerate. Best of all, fuel flow is cut almost in half. According to Bannister, when cruising at 2.0 Mach, the intakes and exhaust nozzles are producing most of the thrust. The Olympus engines, with the thundering 38,050 pounds of thrust on takeoff, are now producing only nine percent of the total thrust. At 2.0 Mach, the ramps have dropped to almost 45 degrees and the air within the duct slows from approximately 1,350 mph at 2.0 Mach to around 500 mph before it enters the engine. All this wizardry happens in about 11 feet of duct.</font>
This is from a thread on Concorde power settings. I'm really at a loss as to what
the intakes and exhaust nozzles are producing most of the thrust means.
Can anybody guess?