CRISP - MTU propulsion system concept for airliners and transport aircraft

Emerging from comprehensive investigation at MTU, the CRISP concept combines the advantages of the conventional turbo-fan, to wit: 1. moderate dimensions for aerodynamically favorable wing-mounting arrangements; 2. aft-mounting option; 3. low noise level, so that even with wing-mounted engines the need for design measures involving major weight penalties is obviated; 4. airframe protected by fan shroud (fan blade containment, noise, bird strike); 5. economical cruise speed possible above Mach 0.8 with the merits of the unshrouded, counterrotating propfan, which are: I. very favorable specific fuel consumption on account of low specific thrust (high propulsive efficiency); II. simple thrust reversal by fan blade pitch control; III. favorable thrust characteristic. At a given cruise thrust the engine can be derated for low turbine inlet temperatures at take-off and climb to economize maintenance costs. CRISP gives MTU a chance - for the first time in a civil engine project - to start in on the ground floor of a program, i.e in the predevelopment phase, and make a prominent contribution towards the definition and implementation of next-generation engines, as it has done before in military projects. (AKF)Available from TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman