swengl
Well-known member
- First Name
- Steve
- Joined
- Sep 9, 2021
- Threads
- 19
- Messages
- 601
- Reaction score
- 1,103
- Location
- United States
- Vehicles
- AWD-CT, Model Y
Another advantage to using a rack system that creates a level carrying surface: You will have more head space to be able to easily get into the vault, which for me is worth the potential range hit of not being as aerodynamic as a rack system that is parallel to the tonneau. I'm looking for a solution that I can easily store as well, so a single piece frame solution is out.I would expect the airflow near the tonneau to roughly follow the tonneau cover, as there won't be much air coming through the tonneau (although some may go around).
Indeed someone has made an approximate rendering of the cybertruck and run it through CFD: https://insideevs.com/news/385328/tesla-cybertruck-aerodynamics-explored-in-detail/ and that also suggests that provided the object is at least a foot behind the peak of the roof there should be very little force on the object perpendicular to the surface of the tonneau.
Compare this to a model 3 with a Skybox 21 on top (i.e. our car last season) where the windshield is forcing a huge amount of air directly up into the skybox.
Now if the object extends to (or forward of) the peak of the roof of a cybertruck then yeah, I would expect a bunch of airflow there (apparently 88mph of wind for a car at 65mph for the Cybertruck) and much of that is perpendicular to the object.
And a note for everyone else... there is a difference between the words "flat" and "level". The Tesla tonneau when closed is as flat as the tonneaus on other trucks. It isn't level but it is flat. Some posts on this thread are confusing to anyone who does know what these words mean.
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