Read e-book online A Solar Car Primer: A Guide to the Design and Construction PDF

By Eric Forsta Thacher

ISBN-10: 3319174932

ISBN-13: 9783319174938

ISBN-10: 3319174940

ISBN-13: 9783319174945

This interesting primer on sunlight Racing actually starts off from the floor up, describing how the interactions of a automobile with its surroundings circumscribe its final luck, from aerodynamics to resistance and propulsion. by means of demonstrating how you can mathematically version those underlying actual phenomena, the writer is helping sunlight racing rivals conscientiously decide on key features of the automobile, equivalent to weight and form, to provide optimum pace. strength conversion and insist are given specific cognizance, via chapters dedicated to studying sunlight racers’ layout, manufacture and checking out utilizing a established problem-solving method to maintain tasks heading in the right direction and on agenda. A bankruptcy dedicated to power administration innovations presents worthwhile tips about maximizing general velocity in the course of a race. advanced concerns equivalent to air flow method research and function simulation are coated in devoted appendices. The monetary element of venture layout isn't really missed, as either fund-raising and price estimation are given in-depth consideration.

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Additional resources for A Solar Car Primer: A Guide to the Design and Construction of Solar-Powered Racing Vehicles

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Wind Averaging As Kurtz (1980) pointed out, real vehicles seldom operate exclusively at zero yaw; there is usually a crosswind. Hence, if a single drag coefficient is to be used in design, it must be the wind-averaged value. But to calculate this value, the relative wind speed and direction and the car’s speed and course must be known at any moment, and the drag coefficient must be known as a function of the yaw angle. The design weather and route supply the former, but wind tunnel tests on models, at least, or coast-down tests with the full-scale car provide the best measurement of the latter.

96  12 Unless the relative wind blows from behind. This is an unusual situation and will be ignored. 4. 5 N. 9N · m. 6 hp. 21 Acceleration Suppose the vehicle is changing cruising speed. Typical solar car speed changes are gradual; the y-axis moment sum and certainly the z-axis force sum will remain zero. 13 So the tractive force must now equal T = M e a + D + R + Wx . 18) The tractive work done by the car in traveling a short distance ∆S over which T may be assumed constant is T(ΔS). Thus, T may be thought of as the tractive work per unit distance.

24 Unsteady Motion Study Steady conditions are uncommon (though simpler to analyze). The car is usually driving into an upgrade or a downgrade or into some other condition affecting its motion. Thus, the speed and torque are usually changing as functions of time. 20) can be used to find the speed as a function of time. The time dependence of the torque (tractive force) must be known, however. Little Taps If the acceleration were constant, the speed at the end of a time interval would be: V2 = V1 + a1 (t1 − t2 ).

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A Solar Car Primer: A Guide to the Design and Construction of Solar-Powered Racing Vehicles by Eric Forsta Thacher


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