Boeing expects to achieve a 1% improvement in specific fuel consumption (SFC) from aerodynamic improvements to the aft fuselage on its re-engined 737 Max.
The airframer is planning a number of changes to the airframe of the 737NG for the Max. However, the majority of these, such as strengthening the fuselage, wing and empennage and lengthening the nose gear, are related to the installation of the Max's CFM International Leap-1B engines.
Improvements to the aerodynamics of the tail cone, however, are solely to boost the aircraft's efficiency. Anita Polt, regional director of product marketing commercial airplanes at Boeing said the changes to the tail cone will generate a SFC improvement of 1%, contributing to the Max's overall fuel consumption reduction of 12% over the 737NG.
The airframer is still working on the design configuration of the 737 Max, including the nose gear extension which will be "no more than eight inches, but probably less than that" said Polt.
Boeing expects to release prices for the re-engined narrowbody by year end.
It has over 700 commitments from nine customers for the type.