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Energy efficient engine: Contra-Rotating Open Rotor (CROR)



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Energy efficient engine: Contra-Rotating Open Rotor (CROR)
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Contra-Rotating Open Rotor (CROR) technology is an innovative type of engine employing two rotors, one behind the other and rotating in opposite directions. The picture shows the complexity of the interactions between the CROR’s two propellers due to the development of rotor blade wake and tip vortices.

Credit: DLR.
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