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Old 04-15-2024, 11:58 AM   #1 (permalink)
aerohead
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Driving a Four-Bolt Chariot

A neighbor who grew up where I live is now teaching teachers, and has been appointed guru of the STEM program, north, in Gainesville.
She talked me into doing an Earth Day program on the 23rd.
Anyway, on the eclipse trip, south of San Antonio, I had some time to think about what disadvantaged youth might value from, pertaining to transportation.
The 85-MPH toll-road between Austin and San Antonio nudged my brain into the 'twisted zone,'
Considering the defunct, twenty-year, 55- MPH national speed limit, some of the numbers I'd run for the Chevy BOLT kind of leaped off the page.
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1) I took the brake horsepower-equivalency requirement for the BOLT, at 55-MPH, and set that as a 'BOLT' power unit baseline.
2) I found multiples of this power requirement at 73-mph, 84-mph, and 93-mph ( the BOLT's top speed ).
3) At 73-mph, a BOLT driver would be experiencing the equivalence of driving 'two' Bolts, compared to 55-mph.
4) At 84-mph, a BOLT driver would be experiencing 'three' BOLTS.
5) At 84-mph, into a 9-mph headwind ( 93-mph air speed ), the BOLT driver would be experiencing the power consumption of 'four' BOLTS.
6) Using the EPA's 100%-to-zero% SOC metric for range, the 'chariot's' range would vary between 374-miles, and 157-miles.
7) Drive time would vary between 6-hours, 49-minutes, and 1-hour, 41-minutes.
8) Energy consumption would vary between 173 Wh/mi, and 412-Wh/mi.
9) It's about as good an example of the aerodynamic power-cubed law as I might be able to conjure up.
10) The posted speed limit on I-35 through Gainesville is 75-MPH, so the kids will be able to connect close to the 73-MPH value in the 'math.'
11) And I have a full-color geometric Road Load power graph for the BOLT which allows quick-comparisons between any 'SPEED' and the power requirement associated with that 'speed'; rolling-resistance and aero..
12) Brake Thermal Efficiency-equivalency ( BTE-e ) is 95%, so arriving at any chosen bhp-e is just a matter of dividing the road load of interest by 0.95.
Wonder what Spartacus would have thought?

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