Quote:
Originally Posted by tomi_k
An attempt to questimate what happens DeltaCd (min.) vs. slope angle (at min DeltaCd). with aft-body -ratio beyond of 0.45....
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A few numbers we have for pickups is for Brett Herndon's Aerolid, for the Ford F-150 pickup. Ford Motor Company was so impressed with Brett's aeroshell that they paid for the wind tunnel testing.
Brett's Aerolid measured a delta-Cd= 0.067 reduction.
Brett's boat tail was good for delta-Cd 0.031 drag reduction.
With both, Aerostealth, who bought one of each, was able to achieve Cybertruck's drag coefficient in 2014.
In Feysal Ahmed's Master's Thesis, he was able to see a delta- 19% Cd with his 3-D type aeroshell.
From the two trips to the wind tunnel with the T-100, with the 'cleanest' configuration, and allowing for the blockage ratio comparison model, there's a strong probability that the truck measured as low as Cd 0.17 ( as a 'camera' truck ), if measured at the A2 Wind Tunnel ( which I hope to validate when I go there ).
Whatever you do, you're not going to see any truly remarkable drag reduction until you put some boat-tailing on the truck. The virtually 'slab-sides' of pickup beds preclude any meaningful pressure recovery along the sides, relying solely on the 'roof' for all the heavy lifting.
