F = A x P x Cd (F is Force, A is cross-sectional Area, P is wind Pressure, and Cd is Coefficient of drag)
P = 0.00256 x V^2 (V is Velocity in mph, and P is pressure in pounds/square foot)
Cd (long rectangular box solid) ~ 2.0 (no dimensions)
So, F = A x 0.00256 x V^2 x 2.0 (F is total Force in pounds)
Here are the numbers for my Corto designs:
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4 x 4 x 8 foot (H x W x L) Corto
Vehicle Wind Area Coefficient Wind Force
Speed Pressure (ft^2) of Drag (Cd) (lbs)
(mph) (lbs/ft^2)
5 0.06 30.0 2.0 2
10 0.26 30.0 2.0 8
15 0.58 30.0 2.0 18
20 1.02 30.0 2.0 33
25 1.60 30.0 2.0 51
30 2.30 30.0 2.0 74
35 3.14 30.0 2.0 100
40 4.10 30.0 2.0 131
45 5.18 30.0 2.0 166
50 6.40 30.0 2.0 205
55 7.74 30.0 2.0 248
60 9.22 30.0 2.0 295
65 10.82 30.0 2.0 346
70 12.54 30.0 2.0 401
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5 x 6 x 12 foot (H x W x L) Corto
Vehicle Wind Area Coefficient Wind Force
Speed Pressure (ft^2) of Drag (Cd) (lbs)
(mph) (lbs/ft^2)
5 0.06 30.0 2.0 3
10 0.26 30.0 2.0 15
15 0.58 30.0 2.0 34
20 1.02 30.0 2.0 61
25 1.60 30.0 2.0 96
30 2.30 30.0 2.0 138
35 3.14 30.0 2.0 188
40 4.10 30.0 2.0 245
45 5.18 30.0 2.0 311
50 6.40 30.0 2.0 384
55 7.74 30.0 2.0 464
60 9.22 30.0 2.0 553
65 10.82 30.0 2.0 649
70 12.54 30.0 2.0 752
While I'm working on my TDT, I'm running some more accurate computational fluid dynamics (CFD) modeling using the actual profile of my TDT designs, but those are computationally intensive. They're usually done on massively-parallel, high-performance computational systems with thousands of processors (way more powerful than the old supercomputers). So, they'll take some time to complete at a reasonable level of precision on my desktop system with hundreds of floating-point processors on a 3-D graphics card.