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ed all along the leading edge in such a way that after obtaining the maximum positive and negative range of aileron control position, the leading edge of the aileron counter-balanced portion does not extend beyond the upper or lower limits of the spar section. They claim this is a decided advantage and makes lateral control easier.

ADJUSTABLE TAIL SURFACES
In large airplanes of the multi-motored type, different schemes have been adopted for varying the tail settings on the horizontal and vertical surfaces to correct for the longitudinal fore and aft trim, due to the variation of load about the normal center of gravity and also for correction of directional control which is ordinarily upset by one motor cutting out, thus making it difficult for the pilot to maintain direction with the flexible rudder control.
In the Bolton and Paul, most of the other British multi-motored types or single motored types requiring for and aft adjustment, the stabilizer is variable in incidence at the control of the pilot from the cockpit. However, in the Vickers Vimy type in correcting for one motor cutting out, the rudder bar in the

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