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Old 05-12-2022, 04:29 PM   #1 (permalink)
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On-road testing by Lightyear

After CFD and wind tunnel, they outfit the car for track testing, with simultaneous 32-channel measurements.
https://lightyear.one/articles/on-tr...ag-coefficient

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Old 05-13-2022, 12:59 PM   #2 (permalink)
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Only need 2 channels of measurement. The wind tunnel speed and the force pushing back on the car.
The most efficient tire, we already narrowed it down to 2 in the USA, it's either mitchlin energy saver A/S or ecopia 442 or whatever the designation is now.
My money is on the energy saver A/S. If you want to sell a car in the US it has to have a dot approved "tyre".
They could just forget about wastefully covering the car with virtue signaling solar panels and just produce the world's most efficient EV now while gas prices are still ridiculously high.
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Old 05-13-2022, 10:23 PM   #3 (permalink)
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I found this interesting, only 15km more range with rear wheel covers?
Posted from their own twitter.
https://twitter.com/lightyear_cars/s...86616613085185

The people are not in favor of it.
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Old 05-14-2022, 12:01 AM   #4 (permalink)
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Quote:
Originally Posted by fusion210 View Post
I found this interesting, only 15km more range with rear wheel covers?
Posted from their own twitter.
https://twitter.com/lightyear_cars/s...86616613085185

The people are not in favor of it.
thats interesting. its also only half a spat. wonder what the range would be if it was a full one... might as well go all out and have better range since people will either like it or not without a middle ground
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Old 05-14-2022, 04:39 AM   #5 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
Only need 2 channels of measurement. The wind tunnel speed and the force pushing back on the car.
If you want to understand current car's efficiency, then yes.

But if you wish to do further improvements, you need all those sensors to understand the pressure in each point.
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Old 05-15-2022, 10:21 AM   #6 (permalink)
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Oxygen sensitive paint has been around forever.
Effectively trillions of sensors per square inch.
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Old 05-15-2022, 12:42 PM   #7 (permalink)
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Why have you never mentioned it before?

https://en.wikipedia.org/wiki/Pressu...t#How_it_works
Quote:
LED lamps of a specific wavelength are used to excite the pressure-sensitive probe within the paint. Once excited, the pressure-sensitive probe is transitioned to a higher energy state where it may either emit a photon or be quenched by local oxygen present. This competing process of emission and quenching determines the intensity response of the paint layer. The result is a dimmer fluorescence where there is higher pressure and brighter response at lower pressures.

The intensity emitted from the surface is then recorded through a long-pass filter by a CCD or scientific grade camera and stored for conversion to pressure using a previously determined calibration. Images of the paint layer are recorded at three conditions. A wind-off image at a known reference condition which is typically standard atmospheric conditions with the tunnel turned off. A wind-on image at a loaded condition where the wind tunnel is running at condition. And lastly a background image where the ambient light present is captured without the illumination source. The background image is then subtracted from the wind-off reference and the wind-on condition image in data processing.

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