Page 18 - Combined_138_OCR

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Such items as bump ft N in hape, headlamp fairing, windshield w rap around,

windshield slope, fast back slope, wheel well openings and rear-end shap ft

are all significant. Close coordination will T C ft o onducted during thi &

phase to insure the desired results will be achieved. It is anticipated that

the earlier literature in earch will resolv C D m ome of these parameters and

H i educe the testing required. Within the scope of the test, however, othe

parameters must be considered.

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Range of the variables such as velocity, angle of yaw and tunnel

total pressure must be integrated hato the schedule. A study will be conducted

to determine, under^highway conditions, what the most prevalent u ros swind

will be (velocity and direction) thereby reducing the numbe 4 of angles

that will need to be investigated. Estimates of forces and pressure to be

expected will be made for data reduction purpose. Also, a data plotting

chedule will be formulated to assist in accurate planning of the test plan.
in
Model design will also C T ft tarted during the phase, once the test

parameters have been decided upon. Cost trade-off and feasibility studie in

will be conducted to determine if existing 3/8-scale models can be utilized

through modification or if an entirely new sectionalized model should C T ft

constructed. If a new model is to be constructed, a study will be made to

determine the feasibility of some scale other than 3/8-scale. In any event

engineering drawings will be made which will allow model construction.

( Chrysler, Huntsville Operations, has the capability to manufactur
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the models. In Tullahoma, Tennessee, 50 miles north of Huntsville, 4s-