Quote:
Originally Posted by Hersbird
This is all computer simulations starting with a .35 pickup (which would be the current best) and they get down to .27 with the best aerocap. Pretty promising. I do think the Cybertruck needs to lose the massive fender flairs to get it.
https://www.google.com/url?sa=t&sour...EmXu3UgQZKxTYj |
The thing about the flares is,that they could produce a 'Whitcombe-waisting/Coke-bottling/sectional density/area-rule' effect,actually mitigating pressure spikes down the side of the body;which is known to be beneficial to drag.They could have 'tuned' it in CFD.They have the vector cloud for all the body parameters and they have the best software on Earth.It's dead nuts on.
*The forward stagnation point is perfect.
*Cowl flow is saturated.
*Windscreen flow is saturated.
*The entire front is in a favorable pressure gradient.
*Roof peak camber is ideal.
*There actually are no straight lines over the entire top of the body.
*The long down-slope of the greenhouse is hypo-critical,it cannot produce vortex drag.The angle won't support it.We know it from the Ahmed body research.
*There will be a small region of separation at the roof apex,then immediate re-attachment,due to the extremely favorable pressure-rise gradient.
*The beltline is inclined forwards,putting the front of the greenhouse into attacking air.Couldn't be better!
*The aft portion of the greenhouse,and on to the C-buttresses is also in attack mode,and along with tumblehome,is killing transverse-flow contamination drag.
*There's no cab/bad gap drag.That was Cd 0.016 on Spirit.
*There's no conventional cooling system drag.Cd 0.025.
*The belly is ideal.Cd 0.045. (Cd 0.07 with diffuser)
*Windshield wipers are insignificant.
*Tesla mirrors are around Cd 0.010,not Cd 0.024 like Spirit's.
*The wheels have quasi-MOON,full covers.
*It's conceivable to have active airdam and diffuser (VOLVO/GM Aero 2000).It's what I'd do.
*The GM aeroshell is built in.(a 19.7% drag reduction)The Cybertruck will be zero-lift and be extremely stable at 130-mph.I can vouch for that from Bonneville.
*Lowered to 8-inches ground clearance,it will drive like a sports car,reminiscent of the 1967 'Carabo' (Lamborghini) it resembles.
*In plan-view,the body has 5-facets,providing drag-reducing body sides longitudinal camber.Beneficial.
*Boat-tailing begins between the two doors,bested only by Impact/EV1,which started half-way on the door.
*Julian Edgar was kind enough to share the SAE Tesla S research is his book.Perhaps he'll have a heads up on Cybertruck for us when it's published.Hope so.