thewayne: (Default)
Swiss and German engineering students are doing some great things!

First up, the Swiss. Swiss students built a car that did zero to 62 MPH (100 KPH) in UNDER ONE SECOND! That is some very impressive engineering. And to top that off, the car achieved that in FORTY FEET! Oh, and they designed, built, and completed the run in ONE YEAR!

The run is so short, and the speed is so low that the car isn't affected by conventional downforce like, say, a Formula 1 car would be, so it took some very impressive aerodynamics to generate it. You also had to control the acceleration in such a way to have zero tire slip because if you're spinning those tires, you're wasting energy and losing speed.

I'm curious how much energy was left in those batteries at the end of the run! My guess is that it that they were very low.

Oh, and the car was driven by a woman. So go, girls!

This will be a very nice line for the students to put on their CVs when they start job-hunting!

https://arstechnica.com/cars/2023/09/this-student-built-ev-just-set-a-new-world-record-for-0-62-mph/


The second record was set inside a German airport hanger, and went in a different direction. A team of seven drivers drove the vehicle that they built for distance, not speed.

From the article: "The car, called muc22, looks more conventional than the Swiss speedster, if only a little. The diminutive coupe in this case was built for efficiency, and in a six-day test at Munich airport, it set a new distance record on a single charge (for a non-solar EV): 1,599 miles (2,574 km), with less battery capacity than many plug-in hybrids—just 15.5 kWh." (emphasis mine)

At a speed of 26 MPH. Not exactly a commuter car, but an impressive technology demonstration. It was driven inside a hanger to eliminate weather factors disturbing the run.

https://arstechnica.com/cars/2023/09/1600-miles-on-a-single-charge-student-built-ev-sets-new-world-record/
thewayne: (Default)
Such as, say, the two hurricanes that have struck Florida in the last twelve months or so.

If the battery gets submerged, it can begin to form salt crystal bridges between battery cells that will cause short circuits, then *POOF* and we have ignition! It takes a crazy amount of water to extinguish an EV battery, so you don't want this to happen, especially if the car is still in your garage!

Officials are advising people with EVs that have become submerged significantly or completely to NOT keep it in your garage, move it at least 50' away from any occupied structures, and notify your insurance company just like if you'd been in an accident.

Some people think that because you don't have an internal combustion engine that it's safe to drive through deep water. It isn't. Last year's FL hurricane saw a few dozen EVs burn, this year at least two - one of them while being transported by the fire department!

This is not specifically a Tesla problem, any EV can have this happen to it if the battery gets submerged. One of the problems is that some fire departments don't understand how to fight an EV battery fire: they just pump water on top, rather than trying to get water underneath it where the battery is, and that water sprayed on top is pretty much wasted. One department made a rig that they could position under the car, then drive a spike into the battery compartment to open a hole, that allowed them to spray water directly into the battery! Very effective technique to get the water into the source of combustion.

I've heard that the foam that fire trucks can spray isn't very effective against EV battery fires, I don't know the details.

https://www.cbsnews.com/news/hurricane-idalia-electric-car-caught-fire-tesla/

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