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Variation of pitching moment with engine thrust for a twin-engine commercial jet aircraft (1977)

Shanks, R. E.

In: CASI

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Publication Date: 2019-06-27

Description: Flight tests were made to determine the effect of engine net thrust on airplane pitching moment for a twin-engine commercial jet transport in the approach, climbout and descent, and cruise configurations. The results indicate that for all the conditions analyzed, the pitching moment due to thrust is somewhat higher than that estimated from the product of net thrust and its moment arm (perpendicular distance from thrust axis to the airplane center of gravity). The differences are attributed to additional moments produced by nacelle normal force, jet-induced downwash, and interaction between wing flow and engine nacelle flow.

Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE

Type: NASA-TM-X-3569 , L-10984

Format: application/pdf

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