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Old 02-29-2020, 11:16 AM   #461 (permalink)
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Originally Posted by freebeard View Post
Perhaps the 'great effort' is not achieving a 0.10 delta, but in finagling a limited production process?

Everybody is going on about mirrors. But Tesla has shown a patent for laser windshield wipers.

electrek.co: Tesla wants to use laser beams to automatically clean debris off cars Yes really
What could possibly go wrong shining powerful lasers toward the eyes of the driver while thousands of tiny prisms are all over the windshield?

It will have wipers, it will have mirrors.

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Old 02-29-2020, 12:59 PM   #462 (permalink)
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.4

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Which means the Cybertruck as shown is nowhere near .30. The most advanced models I have seen tested put it closer to .4 and those still didn't include mirrors or wipers.
I looked at 27-vehicles which either shared similar L/h ratios,or similar aft-body-to-total body length ratio.The 27-vehicle sample had an average Cd 0.231,with a high of Cd 0.44,and a low of Cd 0.137.
At some point,Tesla will publish a paper for the SAE Congress,and we'll have their numbers.
If Cybertruck comes in @ Cd 0.30,with mirrors,then it would be around Cd 0.29 without.
It has none of the architecture of a higher drag form.All the relevant information is in Hucho's text.
AeroStealth had Cd 0.305 with his F-150 back in 2014.It's not that hard to do.
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Old 02-29-2020, 01:29 PM   #463 (permalink)
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Cd 0.30

Green Car Reports reported on a Feb.24 tweet by Musk which reported that Cybertruck 'will' achieve Cd 0.30,not 'maybe.'
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Old 02-29-2020, 01:34 PM   #464 (permalink)
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Originally Posted by aerohead View Post
I looked at 27-vehicles which either shared similar L/h ratios,or similar aft-body-to-total body length ratio.The 27-vehicle sample had an average Cd 0.231,with a high of Cd 0.44,and a low of Cd 0.137.
At some point,Tesla will publish a paper for the SAE Congress,and we'll have their numbers.
If Cybertruck comes in @ Cd 0.30,with mirrors,then it would be around Cd 0.29 without.
It has none of the architecture of a higher drag form.All the relevant information is in Hucho's text.
AeroStealth had Cd 0.305 with his F-150 back in 2014.It's not that hard to do.
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
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Old 02-29-2020, 01:37 PM   #465 (permalink)
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lasers

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Originally Posted by Hersbird View Post
What could possibly go wrong shining powerful lasers toward the eyes of the driver while thousands of tiny prisms are all over the windshield?

It will have wipers, it will have mirrors.
It won't be exactly like that.The choice is about energy efficiency.The laser illumination technology uses less energy per lumen output than LED.A smidgeon more battery range.They can cap the magnitude of output wherever they like.
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Old 02-29-2020, 01:56 PM   #466 (permalink)
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It won't be exactly like that.The choice is about energy efficiency.The laser illumination technology uses less energy per lumen output than LED.A smidgeon more battery range.They can cap the magnitude of output wherever they like.
Tesla fans are not talking about lighting, they are talking about using lasers to clean the windshield and then not use windshield wipers. Lasers powerful enough to vaporize dead bugs and I assume convert water drops to steam on a massive scale in a rainstorm which is the real reason you need wipers, not for a few bugs.
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Old 02-29-2020, 02:05 PM   #467 (permalink)
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Quote:
Tesla fans are not talking about lighting, they are talking about using lasers to clean the windshield and then not use windshield wipers.
Tesla fan 0bserver here.

Everything has fresnel, including the ALON glass. Plus which the patent specifies directed, pulsed lasers not broadbeam [visible?] light.

Maybe a Rocket Bunny-style wide body kit?
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Old 02-29-2020, 02:20 PM   #468 (permalink)
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flares

Quote:
Originally Posted by Hersbird View Post
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.
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Old 02-29-2020, 02:21 PM   #469 (permalink)
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lasers

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Originally Posted by Hersbird View Post
Tesla fans are not talking about lighting, they are talking about using lasers to clean the windshield and then not use windshield wipers. Lasers powerful enough to vaporize dead bugs and I assume convert water drops to steam on a massive scale in a rainstorm which is the real reason you need wipers, not for a few bugs.
All I heard was 'laser blade lighting.'
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Old 02-29-2020, 02:40 PM   #470 (permalink)
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All I heard was 'laser blade lighting.'
Well maybe that will help it "cut" through space and time...
See I can play this game with the best of ya'll.

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