1956 Chevrolet Bel Air/150/210 on 2040-cars

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How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.

Top 11 Lego Technic cars to buy on Amazon in 2024

Autoblog may receive a share from purchases made via links on this page. Pricing and availability are subject to change. I recently got a birthday wish list from my 11-year-old nephew, and I couldn't help but smile when I saw “Lego Technic Cars” at the top. Lego isnÂ’t a phase, itÂ’s a lifestyle. Once a Lego fan, always a Lego fan. In fact, IÂ’d be willing to bet that many of you reading this right now have some kind of Lego vehicle in a box somewhere, or better yet, on display in your home. While theyÂ’re not necessarily cheap, getting into building Lego Technic vehicles doesnÂ’t have to bankrupt you, either, unless you go for the $400 Lamborghini right off the bat. Here are 11 of our favorite Lego Technic vehicles on Amazon, right now, ranging from an affordable $35 all the way up to $450. LEGO Technic Ford Mustang Shelby GT500 Ages 9+ (544 Pieces) - $39.99 (20% off) One of my first and favorite model cars growing up was a first-gen Ford Mustang GT350, so this GT500 for under $40 is right up my alley. At 544 pieces and made for ages 9 and up, the GT500 is a considerable step up from Grave Digger but a great starter to a Technic collection nonetheless. It isnÂ’t the most accurate-looking vehicle in this list, but the AR app and the fact that it can drive make it a worthwhile purchase. $39.99 at Amazon LEGO Technic Formula E Porsche 99X Electric Ages 9+ (422 Pieces) - $49.99 Not a Ford fan? Not a problem. This Formula E Porsche 99X is the same price and better looking than the GT500. Even though there are 122 fewer pieces in this Porsche set, it has a level of detail seen in much more expensive Technic sets including numerous decals and a pull back motor.  $49.99 at Amazon LEGO Technic Jeep Wrangler Ages 9+ (665 Pieces) - $54.99 This is the set I ended up going with for my nephew, not because I think it is the coolest, but because for the price, I think you get the most bang for your buck. 665 pieces is over 50% more than the comparatively priced Porsche 99X and it also scratches the nostalgia itch for me: The first-ever model vehicle I built was a yellow Jeep Wrangler Sahara. This Wrangler Rubicon has definitely had some aftermarket mods like the front winch, which makes it one of the coolest Technic sets under $60.  $54.99 at Amazon LEGO Technic Monster Jam Grave Digger Ages 7+ (212 Pieces) - $34.16 If ever there was a gateway Lego Technic, this Grave Digger is it.

GM executive chief EV engineer says reducing cost of plug-in vehicles is 'huge priority'

As we know, another major automaker investing heavily in electrified vehicles is General Motors, and it's doing things much differently than rivals BMW, Ford or Nissan. The Chevrolet Volt extended-range EV is a modest seller at its $35,000 sticker price but a huge hit with owners. The Chevy Spark BEV, still in limited availability, puts smiley faces on its owners and drivers. The just-introduced Cadillac ELR, a sharp-looking, fun-driving $76,000 luxocoupe take on the Volt's EREV mechanicals, has admittedly low sales expectations. With this interesting trio in showrooms and much more in the works, the third vehicle electrification leader I collared for an interview at Detroit's North American International Auto Show (see #1 and #2) was Pam Fletcher, GM's executive chief engineer, Electrified Vehicles. ABG: Why do your EREVs need four-cylinder power to extend their range when BMW's i3 makes do with an optional 650 cc two-banger? "We designed [the Volt and the ELR] to go anywhere, any time" - Pam Fletcher PF: I get that question all the time: why not something smaller? You don't really need that much. You use the electric to its ability, then you just need to limp. But we designed those cars to go anywhere, any time, and we don't want their performance to be compromised. If you're driving through the mountains, we don't want you to be crawling up grades, or to be limited on any terrain. So it's optimized to be able to travel literally the biggest grades and mountain roads around the globe at posted speeds. Because what if you can't? Another good reason: when the engine is on, you have to run it wide open throttle, max speed, most of the time. And while we can do a lot with acoustics, and the ELR has active noise cancelation, a small-displacement, low cylinder-count engine at high speed, high load all the time isn't something you want to live with. That's how we came up with the balance we did among the key factors of performance, NVH [noise, vibration and harshness] and range. ABG: Where you go from here? Is the range-extender engine due for an update? PF: We know and love the current Volt, and there is still a lot of acclaim about it, so we think it's a good recipe. But we are heavily in the midst of engineering the next-generation car, which I think everyone will love and be excited about.