The Blackbird SR-71 has two Pratt and Whitney J-58 engines. The J-58s are axial flow turbo-jet engines with afterburners, each generating a thrust of 32,500 pounds. The engine inlet is configured with a movable spike or conical centrebody at the front of the engine nacelle which optimises the air flow and increases the thrust of the engine. The after burner and the ejector nozzles, shaped to produce forward thrust at the engine exhaust, were customised for the aircraft's supersonic airbreathing flight.

The aircraft carries 12,200 gallons( 84,000 pounds) of fuel. The gross take-off weight is 140,000 pounds.`

Hat vegul is ebben az elrendezesben semmi kulonos nincs, egeszen a fuvocsoig. Egyedul az a `plane`, ha jol ertettem hogy a fuvocsoben van elhelyezve egy ugynevezett `ejector`. Ennek az a szerepe hogy noveli a toloerot, meghozza olyan mintha egy raketat tennenk be a fuvocsobe, amit kulon uzemanyagforras taplal. Letezik Ramjet es Ejector Nozzle es Scramjet es Ejector Nozzle kombinacioja is.