. Automotive industries . cular path,once It Is there. It can make as short a turn as theordinary vehicle with its wheels turned only half asmuch In relation to the vehicle body as the frontwheels of the ordinary vehicle are turned. Or Itswheelbase can be doubled and It will still run on thesame circle with Its steering angle the same as thatof the free-trailing vehicle. The principle of steeringleading wheels to one course and following wheels toanother course to make both pairs describe the samecourse is the paradoxical principle employed forobtaining all tracking effects, with variation onl
. Automotive industries . cular path,once It Is there. It can make as short a turn as theordinary vehicle with its wheels turned only half asmuch In relation to the vehicle body as the frontwheels of the ordinary vehicle are turned. Or Itswheelbase can be doubled and It will still run on thesame circle with Its steering angle the same as thatof the free-trailing vehicle. The principle of steeringleading wheels to one course and following wheels toanother course to make both pairs describe the samecourse is the paradoxical principle employed forobtaining all tracking effects, with variation only inthe mechanical means. the shortest turn, it is usually assumed, and ability toturn sharply when necessary is the main object in find the closest tracking system, it may be said, andbe done with it. But perhaps the assumption should notbe accepted without reservation, since there is no trackingin a turn on the spot, for example. A once over of thesubject in print and diagrams cannot help facilitating SB<8. f^B<@ Figs. 3, 4 and 5—Fig. 3 shows the symbolic figurerepresenting a tractor cab or short truck with a semi-trailer hitched to it by means of a fifth-wheel couplingapproximately in line with the rear wheel axle of thetractor unit. Rear wheels trail freely after the frontwheels and the senl-trailer wheels freely after the rearwheels. No tracking Is attempted. Fig. 4 representsa truck or automobile pulling a two-wheel trailer tracks more or less closely after the reartruck wheels, because the pintle hook swings to theleft, in relation to the trailer, when the truck turns tothe right. Fig. 5 represents a tractor with a train ofthree four-wheel trailers, which may have either fifth-wheel steering or automobile steering linkage. Allrear wheels trail freely, but front wheels of next unittrack after them approximately. The total effect isfar from tracking, but trains of trailers are used onlyfor very favorable conditions, excluding sharp curvesand
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
