Propeller driven vehicle with forward and reverse control air rudders

In combination with a vehicle to be propelled by a rearward discharge of fluid therefrom and including fluid jet developing means for discharging a rearward jet of fluid along a predetermined path, a steering, reversing and forward aggregate thrust nullifying control means including a pair of upstanding steering vanes mounted from said vehicle for oscillation about upstanding axes spaced transversely apart and disposed on opposite sides of the center line of said path and fixed relative to said vehicle, said control means including means operative to simultaneously similarly angularly displace said vanes about said axes, said vanes extending rearward of said axes distances greater than one-half the distance between said axes, said control means including first remotely operable and reversible motor means connected betwen said vehicle and one vane operative, only, to selectively angularly displace said one vane about its axis of oscillation relative to said vehicle and parallelogram link means supported solely from and connected between said vanes for substantially simultaneously and equally angularly displacing the other vane about its axis of oscillation relative to said vehicle responsive to angular displacement of said one vane by said first motor means, said parallelogram link means including second remotely operable and reversible motor means operative to vary the effective length of said link means whereby to effect angular displacement, only, of said other vane relative to said vehicle and one vane.