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Old 02-05-2021, 02:12 PM   #11 (permalink)
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Quote:
Originally Posted by AeroMcAeroFace View Post
1) What is the relevance to your calculations? Tesla used to use the front/rear power split to maximise efficiency as the motors had different efficiency bands, I don't know if they still do.

2)Relevance?

3)True, apart from the fact I am not an engineer

4)Assumptions of constant efficiency are perfectly adequate,(assuming you know that there is a small margin of error) we can agree there also. Thanks for clearing that up.
1) As Tesla is the gold standard for efficiency, your points would not be lost on them, and if they thought it was merited, they could go to a 2-speed trans, as Porsche has. Sandy Munro, of Munro Associates has reported on this topic specifically.
Cybertuck / tadpole is limited to aerodynamics vs road load, in comparison to a Cybertruck with the body shape of an Silverado / Sierra, F-150, RAM 1500, and Cybertruck 'naked'. The 'shape' is the only variable.
Range remains an issue. 800-plus miles per charge may be of interest to those with range anxiety. Cd 0.10 leaves something on the table.
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2) Karlsruhe claims that the only issue for them, were the items listed, and with enhancements of magnet positioning, they were able to shape the magnetic field lines of flux in their motor, to overcome the Lorentz - Reluctance conflict, rendering the high-rpm issue mute.
Living off the grid for a decade, we learned that out inverters operated at their maximum efficiency at maximum load. Heat sinks for MOSFETS, IGFETS, whatever, were sized for the heat flux at 100% load.
Thermal management at battery, power conversion, and motor, all seem to be 'engineered ' for.
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3) Even the SAE Paper on the 1934 Chrysler De Soto Airflow, aerodynamic test-mule experiments included constant BSFC in their energy balance methodology. I think engineers have used it way before gasoline or diesel ever existed. Wood. Coal. Capitalism demands the fewest unknowns. H. Ross Perot's Electronic Data Systems built an economic empire from table scraps IBM was comfortable throwing way.
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4) Yes, a smidgeon of inexactness is a luxury which we are all accorded.

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Last edited by aerohead; 02-05-2021 at 02:37 PM.. Reason: add data
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Old 02-07-2021, 03:16 AM   #12 (permalink)
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Ford XLT Naked - '14 Ford F-150 XLT
90 day: 15.04 mpg (US)

Ford G-4 with Stinger - '14 Ford F-150 4X4 Super Crew XLT
90 day: 19.8 mpg (US)

Ford Stealth G-4 - '14 Ford F-150 4X4 Super Crew XLT
90 day: 18.13 mpg (US)

XLT Towing Keystone 5th wheel trailer - '14 Ford Keystone 5th Wheel XLT
90 day: 9.45 mpg (US)

Trip 2015 C Max Energi - '15 Ford C Max Energi SWP
90 day: 38.2 mpg (US)

Local 120 volt 2015 C-Max Energi - '15 Ford C-Max Energy SEL
90 day: 55.65 mpg (US)

Local 240 volt 2015 C-Max Energi - '15 Ford C Max Energi SLE
90 day: 57.63 mpg (US)

Energi IC only - '15 Ford C Max Energi Leather
90 day: 31.86 mpg (US)

Energi EV Only - '15 Ford C Max Energi Leather
90 day: 107.16 mpg (US)

Energi Combined - '15 C Max Energi Leather
90 day: 50.1 mpg (US)

Ford Explorer - '20 Ford Explorer XLT
90 day: 24.33 mpg (US)
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https://youtu.be/5-p88HW1Drg

My new YouTube video blog on the relative drag of the Cybertruck, Rivian, and Ford trucks. This is for Phil Knox if he sees this.
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Old 02-10-2021, 02:16 PM   #13 (permalink)
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YouTube

Thanks John!
For a recap of the video, here's some tabular data used in the creation of the charts:
* All trucks of equal 6,000-pounds curb weight
* All trucks of equal 36- square-foot frontal projected area
* All trucks of equal Rolling-Resistance power absorption coefficient, and equal to that derived from empirical testing of the Tesla Model X
* Standard SAE air density ( rho ) 0.00238 slugs
* Fully warmed, straight, level, dry, calm, sea level, constant-velocity
* Horsepower X 0.7457 = kW
--------------------------------------------------------------------------
At 130-mph:
+ Cd 0.40 Road Load power = 144.9-hp ( 108- kW )
+ Cd 0.35 = 129.3-hp ( 96.4-kW )
+ Cd 0.30 = 113.8-hp ( 84.9-kW )
+ Cd 0.25 = 98.3-hp ( 73.3-kW )
+ Cd 0.20 = 82.9-hp ( 61.8- kW )
+ Cd 0.10 = 53.9-hp ( 39.5-kW )
+ Rolling Resistance Road Load fraction = 20.7545-hp
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Old 02-11-2021, 01:36 PM   #14 (permalink)
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Ford XLT Naked - '14 Ford F-150 XLT
90 day: 15.04 mpg (US)

Ford G-4 with Stinger - '14 Ford F-150 4X4 Super Crew XLT
90 day: 19.8 mpg (US)

Ford Stealth G-4 - '14 Ford F-150 4X4 Super Crew XLT
90 day: 18.13 mpg (US)

XLT Towing Keystone 5th wheel trailer - '14 Ford Keystone 5th Wheel XLT
90 day: 9.45 mpg (US)

Trip 2015 C Max Energi - '15 Ford C Max Energi SWP
90 day: 38.2 mpg (US)

Local 120 volt 2015 C-Max Energi - '15 Ford C-Max Energy SEL
90 day: 55.65 mpg (US)

Local 240 volt 2015 C-Max Energi - '15 Ford C Max Energi SLE
90 day: 57.63 mpg (US)

Energi IC only - '15 Ford C Max Energi Leather
90 day: 31.86 mpg (US)

Energi EV Only - '15 Ford C Max Energi Leather
90 day: 107.16 mpg (US)

Energi Combined - '15 C Max Energi Leather
90 day: 50.1 mpg (US)

Ford Explorer - '20 Ford Explorer XLT
90 day: 24.33 mpg (US)
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https://youtu.be/ESlv1EtX6Mk

My video on how the enhanced lower drag body form of the Tesla Cybertruck results in better performance. A shout out to Phil Knox whom I credit in my Part II video.
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Old 02-12-2021, 06:50 PM   #15 (permalink)
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Join Date: Dec 2014
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Ford XLT Naked - '14 Ford F-150 XLT
90 day: 15.04 mpg (US)

Ford G-4 with Stinger - '14 Ford F-150 4X4 Super Crew XLT
90 day: 19.8 mpg (US)

Ford Stealth G-4 - '14 Ford F-150 4X4 Super Crew XLT
90 day: 18.13 mpg (US)

XLT Towing Keystone 5th wheel trailer - '14 Ford Keystone 5th Wheel XLT
90 day: 9.45 mpg (US)

Trip 2015 C Max Energi - '15 Ford C Max Energi SWP
90 day: 38.2 mpg (US)

Local 120 volt 2015 C-Max Energi - '15 Ford C-Max Energy SEL
90 day: 55.65 mpg (US)

Local 240 volt 2015 C-Max Energi - '15 Ford C Max Energi SLE
90 day: 57.63 mpg (US)

Energi IC only - '15 Ford C Max Energi Leather
90 day: 31.86 mpg (US)

Energi EV Only - '15 Ford C Max Energi Leather
90 day: 107.16 mpg (US)

Energi Combined - '15 C Max Energi Leather
90 day: 50.1 mpg (US)

Ford Explorer - '20 Ford Explorer XLT
90 day: 24.33 mpg (US)
Thanks: 2
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https://youtu.be/V9Z63I6J9qI

Latest YouTube video on Cybertruck versus Ford F-150 XLT Eco Boost gas truck. For Phil Knox.

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