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Old 02-05-2021, 01:12 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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Old 02-07-2021, 02:16 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: 18.37 mpg (US)

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90 day: 9.58 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 Combined - '15 C Max Energi Leather
90 day: 51.2 mpg (US)

MoonDust for Travel - '19 Chevrolet Bolt LT
90 day: 123.11 mpg (US)

MoonDust 3 with 90% CE - '19 Chevy Bolt LT
90 day: 127.57 mpg (US)

Ecopia IV - '19 Chevy Bolt Lt
90 day: 126.39 mpg (US)

Ecopia IV Trip Log - '19 Chevy Bolt LT
90 day: 121.01 mpg (US)

Rate Rider Chevy Bolt - '19 Chevrolet Bolt LT-2
90 day: 123.16 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, 01:16 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, 12:36 PM   #14 (permalink)
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Ford XLT Naked - '14 Ford F-150 XLT
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Local 120 volt 2015 C-Max Energi - '15 Ford C-Max Energy SEL
90 day: 55.65 mpg (US)

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90 day: 51.2 mpg (US)

MoonDust for Travel - '19 Chevrolet Bolt LT
90 day: 123.11 mpg (US)

MoonDust 3 with 90% CE - '19 Chevy Bolt LT
90 day: 127.57 mpg (US)

Ecopia IV - '19 Chevy Bolt Lt
90 day: 126.39 mpg (US)

Ecopia IV Trip Log - '19 Chevy Bolt LT
90 day: 121.01 mpg (US)

Rate Rider Chevy Bolt - '19 Chevrolet Bolt LT-2
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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, 05:50 PM   #15 (permalink)
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Ford XLT Naked - '14 Ford F-150 XLT
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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: 18.37 mpg (US)

XLT Towing Keystone 5th wheel trailer - '14 Ford Keystone 5th Wheel XLT
90 day: 9.58 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 Combined - '15 C Max Energi Leather
90 day: 51.2 mpg (US)

MoonDust for Travel - '19 Chevrolet Bolt LT
90 day: 123.11 mpg (US)

MoonDust 3 with 90% CE - '19 Chevy Bolt LT
90 day: 127.57 mpg (US)

Ecopia IV - '19 Chevy Bolt Lt
90 day: 126.39 mpg (US)

Ecopia IV Trip Log - '19 Chevy Bolt LT
90 day: 121.01 mpg (US)

Rate Rider Chevy Bolt - '19 Chevrolet Bolt LT-2
90 day: 123.16 mpg (US)

Teal Force One - '24 Hyundai Ioniq 5 SEL
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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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Old 03-03-2021, 02:03 PM   #16 (permalink)
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latest YouTube

So after being stranded on ice for seven days, then a week with the internet down, I finally had a look at the video.
Anyone born here today, will be getting their learner's permit about the time pistons go the way of the Dodo bird.
Being able to compare gallons to kWhs, and BSFC to BSFC-e will be handy in navigating the not-so-far-off future of automobiles. Brake Specific Energy Consumption will be a useful tool.
' You better slice that pizza in four pieces. I don't think I can eat six.' Yogi Berra
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Old 03-05-2021, 02:02 PM   #17 (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: 18.37 mpg (US)

XLT Towing Keystone 5th wheel trailer - '14 Ford Keystone 5th Wheel XLT
90 day: 9.58 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 Combined - '15 C Max Energi Leather
90 day: 51.2 mpg (US)

MoonDust for Travel - '19 Chevrolet Bolt LT
90 day: 123.11 mpg (US)

MoonDust 3 with 90% CE - '19 Chevy Bolt LT
90 day: 127.57 mpg (US)

Ecopia IV - '19 Chevy Bolt Lt
90 day: 126.39 mpg (US)

Ecopia IV Trip Log - '19 Chevy Bolt LT
90 day: 121.01 mpg (US)

Rate Rider Chevy Bolt - '19 Chevrolet Bolt LT-2
90 day: 123.16 mpg (US)

Teal Force One - '24 Hyundai Ioniq 5 SEL
90 day: 96.87 mpg (US)
Thanks: 2
Thanked 528 Times in 278 Posts
https://youtu.be/YqOJ-Sh-w6U

My March 5th, 2021 video on the enhanced Cd performance (Cd = 0.25 and Cd = 0.20 ) of the Tesla Cybertruck and a discussion of the Well to Wheel of of EV's versus ICE.
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Old 03-05-2021, 04:41 PM   #18 (permalink)
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wells-to-wheels

Thanks John.
Ph.D. Michael E. Wysession's Great Courses lecture series on energy, I believe, came up with an average 15% overall thermal-mechanical efficiency for internal combustion vehicles, so your numbers are spot-on according to his research.
In nine years, some carmakers will have already put all their pistons out to pasture.
Cutting BSFC by 66% is a smart move.
Get rich slow.
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Old 03-26-2021, 03:29 PM   #19 (permalink)
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tadpole aero trailer

This image survived in my photo albums and will give a 'face' to the concept of a range-extending trailer.
Low drag and 'length' go together. Trailers add length. Streamline them and you get past the 'practical' length issue.
Any penalty from added rolling resistance is overwhelmed by the drag reduction, netting an overall range improvement.
https://ecomodder.com/forum/member-a...ed-micro-r.jpg
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Old 03-31-2021, 04:16 PM   #20 (permalink)
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BamZipPow shows the way

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