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Old 10-29-2019, 11:17 AM   #1 (permalink)
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Lowest Cd of Production Car

Lightyear has just released the results of their recent windtunnel tests.

A record-breaking drag coefficient (Cd of 0.20) has been reached. It's built to perform on energy efficiency. Read more on the Lightyear website News section.

What do you think? Will other EV's follow in striving towards energy efficiency?

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Old 10-29-2019, 11:44 AM   #2 (permalink)
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Other EVs aside from tesla are all based on gas burner or gas burner hybrid bodies and they just don't need to be all that aerodynamic.
To get below about .25 or .23 the vehicle has to be designed around aerodynamics.
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Old 10-29-2019, 02:00 PM   #3 (permalink)
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Quote:
Originally Posted by pieter_ly View Post
Read more on the Lightyear website News section.
https://lightyear.one/news/

Latest entry is Sept 19.................still not seeing it...............oh, now I see it.

October 29, 2019
https://lightyear.one/news/a-car-bui...rgy-efficiency
Quote:
Lightyear One’s design allows it to attain record-breaking drag coefficient (Cd) of 0.20 and to be the most aerodynamic 5-seater to date.
Video in link above.

Still do not see where it a projected or test results number, but still watching the long video.
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Old 10-29-2019, 03:57 PM   #4 (permalink)
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First you need to consider both Cd and frontal aera. I could make a jumbo jet with a low Cd but it would take an enormous amount of power because of the frontal aera.
Second, I don't think that classifies as a production car. The VW XL1 was actually in production even If not available in the USA. It was .189 Cd so it beats the Lightyear's goal.
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Old 10-29-2019, 07:35 PM   #5 (permalink)
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Good points.

Looks like the earlier VW-L1 (Diesel - tandem seating) never made it into production.

Volkswagen 1-litre car
https://en.wikipedia.org/wiki/Volkswagen_1-litre_car
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Old 10-29-2019, 07:46 PM   #6 (permalink)
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The XL1 was not a 5 seater.
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Old 10-30-2019, 12:08 PM   #7 (permalink)
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Who said anything about 5 seaters only?
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Old 10-30-2019, 12:10 PM   #8 (permalink)
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Quote:
Originally Posted by kach22i View Post
Good points.

Looks like the earlier VW-L1 (Diesel - tandem seating) never made it into production.

Volkswagen 1-litre car
https://en.wikipedia.org/wiki/Volkswagen_1-litre_car
They produced 250 right? The price was better than the zero production vehicles so far by Lightyear.
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Old 10-30-2019, 01:52 PM   #9 (permalink)
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https://www.greencarreports.com/news...erodynamic-car

The VW XL1 is no longer in production.
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Old 10-30-2019, 06:51 PM   #10 (permalink)
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Quote:
Originally Posted by NeilBlanchard View Post
https://www.greencarreports.com/news...erodynamic-car

The VW XL1 is no longer in production.
But the Lightyear isn't a current production car either. That being said, once one car sets a record it holds the record until being beaten. It doesn't lose the record just because it isn't currently being produced. I have a feeling VW (and other makers) may have a few other pre-production projects out there that also might be better as well, the difference is they aren't making promises looking for deposits. Build the car, deliver it to customers, then you can start claiming record this or record that.

PS I just re-read the quote. They said "Lightyear One will likely be the most aerodynamic car available in the market." Of course the VW XL1 is available on the market, just used (although the few that have shown up are actually still actually new with like 10 miles on the odometer). So they say "likely" and they actually mean "new market".

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