The truck had a CD the same as a Porsche GT3.
Porsche GT3 doesn?t have a Cd you?d want for an LSR car... big dangly wings and massive open cooling. There?s at least 20 if not 25 counts (1 count is 0.001 Cd) of cooling drag on that car.
The thing I?m starting to notice is that not many people in the community know what they should be targeting for drag, lift or frontal area.
In the production industry we build databases of competitive products so we can try to predict trends etc.
If you guys are interested and want to share data I can put together something like that for each of the classes (that generate this sort of data). We?d have to account for differences in testing methodology but I think I might be able to do it with an uncertainty band.
Let me know if there?s interest, the more people on board the better the data will be. My intention would be to publish all of this for the community, may even be an SAE paper in it.