Quote:
Originally Posted by freebeard
Let's ask aerohead.
Note the 'from Hucho' in upper left. |
I'd be 'figuring' from Cd 1.17, but it doesn't matter as long as the premise is reported, as Gary has done in the video. It's said that, some aeronautical engineers are found to adhere to the Cd 1.0 for a flat-plate, perpendicular to the airstream.
Aeronautical engineer Larry Mauro uses Cd 1.0 in his aircraft and solar race car designing.
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The drag table is from Hucho's 2nd-Edition, Aerodynamics of Road Vehicles, who is citing Sighard Hoerner's, 1965, Aerodynamic Drag.
NOTE:
The 'Streamlined body l/D = 2,5, 3rd from the bottom of the table is what all three of the aerodynamic streamlining templates are based upon.
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With respect to CYBERTRUCK, what was gleaned from Spirit of EcoModder.com's two trips to the DARKO Wind Tunnel ( sister tunnel to the A2 ):
1) 'Spirit' was capable of as low as Cd 0.1675 @ DARKO.
2) Cd 0.1528 @ A2 ( based on Prius-III Toyota' full-scale wind tunnel blockage-ratio correction factor, inter-tunnel comparisons ).
3) And Cd 0.1469 @ Toyota's full-scale wind tunnel ( by same factor ).
4) Essentially a 'GAC Eno.146' of pickup trucks.
The plan is to compare A2 values, and perhaps do the Aerodyne Wind Tunnel as well, with wheel rotation, larger test section area ( reduced blockage-ratio % ), and floor boundary-layer suctioned off.