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Originally Posted by Glee17
I do remember a white plastic model being prepped for the wind tunnel.
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Hi Geoff - Could be. The report states that the 1/18th die cast model was used in the water tank, but...
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A 1/25th scale model Dodge Ram ... (plastic) was purchased for use in the wind tunnel. The smaller size of this model was desired since the larger 1/18th scale model is too large and heavy... to be used efficiently. It sits too close to the wall of the test section, causing the boundary layer of the wall to impinge on the flow over the truck, thus creating less accurate results. (p. 8)
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(Quoting Geoff again...)
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Originally Posted by Glee17
The force data from the wind tunnel may be suspect if the measuring instruments we're not calibrated well, or if the truck was tilted at all, or if they were measuring strain on the post holding the truck. All of which were possible.
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I'm not clear on how the scale balance is set up. Can you explain it?
I'm guessing there's an actual scale to measure lift (which the student wasn't measuring for this test). For measuring drag force, is there a pivot on the rod holding the model (at the "floor" of the test area), and drag force is measured on the other side of the pivot point?
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I would love to see that report.
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As it turns out, I tracked down the author and he got back to me yesterday. I'll ask, and If he gives permission to distribute the report, I'll make a digital copy (photos).