VI tail

VI tail

Pronounced “vee eye” tail. A tailplane, used either by itself or in addition to a trimming tab, in which the incidence can be varied to balance out-of-trim forces. This arrangement is more effective than trim tabs at high Mach numbers. Its method of operation is usually operated mechanically and initiated electrically. See variable-incidence tailplane.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved