Projected visual training aid

Claim 1

A visual training aid for use in conjunction with a fixed base flight trainer to project a scene indicating apparent changes in the trainee''s positional viewpoint with respect to an assumed runway to which simulated landing approaches are made, said training aid comprising: a. an overheAd projector; b. a plurality of opaque mechanical members arranged to define a trapezoidal outline, said members being mounted in covering relation to the reflecting surface of said projector, said members including: 1. a stationary member having an edge representing the upper base of said outline; 2. a linearly movable member having an edge representing the lower base of said outline; and 3. a pair of rotatably movable members each having an edge representing one side of said outline; c. a transparent disk with opaque indicia thereon rotatable about an axis between and parallel to the axes of rotation of said pair of members, and mounted in covering relation to said reflecting surface; d. individual servo drive means for positioning said linearly movable member, each of said pairs of rotatably movable members, and said disk; and e. computing means obtaining inputs from the fixed based trainer defining the simulated position of said trainer with respect to a runway and providing outputs commensurate therewith to said servo drive means to position said members to provide a proper perspective by varying said outline and to position said disk so that said opaque indicia are centered between said edges of said rotatable members.