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Old 01-13-2022, 12:00 PM   #21 (permalink)
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RIVIAN weight

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Originally Posted by hayden55 View Post
Considering the rivian r1t weighs 7150lbs (bout 1.65 rangers) and is the size of a Ford Ranger with a narrower cab but longer, probably only because of the gear tunnel, itís a damn tank! (Per edmunds)
They did note all range testing with all season tires.
I wanna see a range test with 11,000 pounds on it. Well maybe not letís be honest nobody is gonna tow long range with it. More of a product to compete with other toy cars like land rovers etc...
For the most part Iím impressed to see a truck with a low drag coefficient and decently low frontal area.
Considering it has 4 electric motors itíll be great off road as well at the ohv parks.
https://www.google.com/amp/s/www.edm...fficiency.html
1) Rivian's rolling resistance road load is about 18.2981-hp @ 100 km/h.
2) At an EPA test weight on the dynamometer of 7,443-pounds, it yields a Coefficient of rolling resistance near Cfrr= 0.014869609 on the mud and snow tires.
3) You could play with different test weights and calculate different rolling loads at the same velocity.
4) Bear in mind that with EVs, 'weight' can be an advantage, with respect to momentum-to-electric regeneration. Volvo published an SUV EV study indicating a curb-weight 'sweet-spot'.
5) On You-Tube, I provided AeroStealth some road load tables, which demonstrate where power is being absorbed out on the open road. You may discover that 'weight' is rather meaningless at 'speed.'
Look for John Gilkison You-Tube

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Old 01-15-2022, 01:11 PM   #22 (permalink)
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Quote:
Originally Posted by JSH View Post
EPA efficiency ratings include charging losses (Based on using the internal charger not DC fast charging)



Rivian announced their 2021 production numbers yesterday (11-Jan-2022)

R1T, R1S, EDV production: 1,015
(including 12 R1T in Q3 and 1,003 total of all types in Q4)

R1T, R1S, EDV deliveries: 920
(including 11 R1T in Q3 and 909 total of all types in Q4)
But the EDV seems to be 90% of that production and that's not the "truck of the year".

I too feel something that may only amount to a few thousand deliveries in 2022 shouldn't be considered "available". The Ford Lightning is probably as good as the Rivian and although they will make probably 10 times as many in 2022 it really wont be available widely until 2023 or even 2024.
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Old 01-15-2022, 05:25 PM   #23 (permalink)
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Originally Posted by Hersbird View Post
But the EDV seems to be 90% of that production and that's not the "truck of the year".
At the risk of sounding like a broken record, I'll quote my earlier post which you seem to have missed:

Quote:
As of December 15, 2021, we have produced 652 R1 vehicles and delivered 386 of those, including the production and sale of our first two R1S vehicles earlier this week.
That means at most 363 EDV--which is almost certainly an overestimate since their goal was 10 EDV by the end of 2021.
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Old 01-16-2022, 02:47 PM   #24 (permalink)
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Originally Posted by Vman455 View Post
At the risk of sounding like a broken record, I'll quote my earlier post which you seem to have missed:



That means at most 363 EDV--which is almost certainly an overestimate since their goal was 10 EDV by the end of 2021.
But going forward, and it appears already in Q4 the shift is to the Amazon trucks. So they have 600 R1T before 2022 started, and maybe they keep that pace per quarter for 2022 which means 3000 trucks total on the road by the time 2022 is over. Actually at least 600 of those will be 2023 models by that point. It would be great if they ramped up production of the R1T but it really seems like they just pushed out a "first" and will get back to it later.
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Old 01-17-2022, 11:16 AM   #25 (permalink)
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Originally Posted by aerohead View Post
1)
4) Bear in mind that with EVs, 'weight' can be an advantage, with respect to momentum-to-electric regeneration. Volvo published an SUV EV study indicating a curb-weight 'sweet-spot'.
Do you have a link?

I tried searching it but i only found a study by them on the average life cycle of a car that they used for comparison of life cycle emissions (which i noted they expected it to be 200,000 km or 124,000 mi before dissassembly and recycling). The average here in america for age of car on road is 12.1 years and at 15,000 miles per year average thats 181,500 miles.
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Old 01-17-2022, 11:45 AM   #26 (permalink)
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1) and 4)

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Originally Posted by hayden55 View Post
Do you have a link?

I tried searching it but i only found a study by them on the average life cycle of a car that they used for comparison of life cycle emissions (which i noted they expected it to be 200,000 km or 124,000 mi before dissassembly and recycling). The average here in america for age of car on road is 12.1 years and at 15,000 miles per year average thats 181,500 miles.
A) MOTOR TREND published data for the R1T.
B) EPA HWY is 66 MPG-e.
C) I'm guestimating that an owner might see the EPA MPG @ 100 km/h ( AeroStealth's 2014 F-150 produced its EPA HWY mpg @ 100-km/h )
D) With a useable 133-kWh, 133,000-watt/h, and 66 mpg= 296.057-miles.
E) 449.237 Wh/mile
F) @ 95% efficiency ,Road Load is 426.77571 Wh/mi, or 35.4835- hp.
G) Estimating a frontal area of 35.212-sq-ft, and 90.933 feet/second, aero power absorption is 17.1854-hp.
H) Subtracting that from Road Load, leaves 18.298 hp- RR left over.
I) @ 90.933 ft/sec, 550-lb-ft/sec/ hp, and 7443-pounds test weight, the Tire rolling force coefficient of 0.014869609 falls out.
So that's where the Cf rr comes from.
--------------------------------------------------------------------------------------
I'll have to look through my rat's nest at home to see about the VOLVO EV SUV research. It was either SAE or Elsevier Publishing where it came from.
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Old 01-18-2022, 09:43 AM   #27 (permalink)
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Hmmm 449.237 wh/mi is only slightly better than my ranger at it's calculated 453, AND said ranger was noted to be as efficient as a common clay brick.
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Old 01-31-2022, 12:26 AM   #28 (permalink)
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https://youtu.be/Zce-wC__kkU

One of the first test I've seen with towing. Synopsis is mostly to stay in town if towing lol
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Old 01-31-2022, 01:22 PM   #29 (permalink)
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Quote:
Originally Posted by hayden55 View Post
https://youtu.be/Zce-wC__kkU

One of the first test I've seen with towing. Synopsis is mostly to stay in town if towing lol
Towing 8100lb from 5,000 ft to 11,000 ft elevation, at highway speeds, with temps in the 30's = 0.5 miles per kWh. I'm not sure what that tells me about realistic tow range but I guess we could use that as the absolute worst case scenario.

They say they are going to do another video with a more realistic tow with a more realistic payload vs a ICE truck.


I was most interested to see 55 kWh at the charger to add 45 kWh to the truck's battery. 18% loss when DC Fast charging - that is a lot of electricity being wasted as heat.

Also it out-accelerated a V8 Ram that was empty while towing 8100 lbs.
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Old 01-31-2022, 01:56 PM   #30 (permalink)
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453

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Originally Posted by Piotrsko View Post
Hmmm 449.237 wh/mi is only slightly better than my ranger at it's calculated 453, AND said ranger was noted to be as efficient as a common clay brick.
453 would put you below the Audi E-tron ( 476 Wh/mi )and Porsche Taycan ( 454 Wh/mi ), GMC HUMMER ( 783 WH/mi ), F-150 Raptor 37 ( 1976 Wh/mi ) Honda Ridgeline ( 1400 Wh/mi ), Maverick ICE ( 1162 Wh/mi ), Santa Fe ( 1248 Wh/mi ), JEEP WRANGLER 4Xe Plug-In Hybrid ( 750 Wh'mi ), RAM 2500 ( 2220 Wh/mi, RAM 1500 TRX ( 2400 Wh/mi ).

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