f17582d2_engine___Free_net_encyclopedia__Type
[Description] Intake air is compressed but not slowed to below supersonic, intake, combustion and exhaust occur in a single constricted tube [Advantages] can operate at very high Mach numbers (Mach 8 to 15)[1] [Disadvantages] still in development stages, must have a very high initial speed to function (Mach >6), cooling difficulties, inlet difficulties, very poor thrust/weight ratio (~2), airframe difficulties, testing difficulties [Type] 
Scramjet
Jet engine - Free net encyclopedia
Type