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16th August 2004 | 13:33

#7 (permalink)

BOAC

Per Ardua ad Astraeus

Joined: Mar 2000

Posts: 18,575

Likes: 4

From: UK

RIS - cruise efficiency - due to extra weight at the back requiring an UPLOAD on the tailplane (thereby helping) instead of a DOWNLOAD which means the wing needs to produce more lift.