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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.

Trucks and tidbits from GM's earnings report

General Motors announced this morning that 2018 was a good year for it financially, thanks in large part to the company's performance in North America, which was predicated, according to the company, on "strong pricing, surging crossover sales, successful execution of the company's full-size truck launch, growth of GM Financial earnings, and disciplined cost control." GM reported full-year income of $8.1 billion and EBIT-adjusted income of $11.8 billion. Crossover sales in 2018 were 1,034,808, an increase of 7 percent compared to 2017 deliveries. Throw in the body-on-frame SUVs and the ute number is a total 1,295,700. But let's face it: It is the trucks that really matter. The Chevy Silverado and Colorado, the GMC Sierra and Canyon. Altogether, GM sold 973,463 pickups in the U.S. in 2018. Although Ford gets bragging rights for F-Series sales, GM gets to point out that it has a greater aggregate number. An important factor regarding the trucks and the reported income is that during the last quarter, more than 90 percent of the new 2019 trucks were crew cabs (which have a higher sticker), and at GMC more than 70 percent were Denali and AT4 models (which have even higher stickers). According to reporting by Bloomberg, GM's pickup trucks combine for $65 billion in annual revenue. Clearly when the 2018 sales of the Silverado — 585,581— dwarf the combined sales of both Buick (206,863) and Cadillac combined (154,702), pickups are what matter to the overall health of the company in a way that it is difficult to otherwise achieve. The "disciplined cost control" is something that is very much in the public eye right now, as the company is taking out thousands of its workers, and there is still the "unallocated" plant situation and other plants that will remain under capacity. The numbers in GM's earnings report probably made Unifor members' heads explode in consternation, coming fresh off their Super Bowl ad: " GM, you may have forgotten our generosity, but we'll never forget your greed." But there are a couple of curiosities in the full GM earnings release. One is that so far as its autonomous efforts go, it mentions only that (1) in the first quarter of 2018 Cruise introduced a production-ready autonomous vehicle, and (2) Cruise attracted $5 billion in external capital from SoftBank and Honda. Not a whole lot of love for autonomy. Good thing they have the trucks to fund the program, to say nothing of the external capital.

GM forced to cut truck production amid semiconductor shortage

WASHINGTON — General Motors said Wednesday it will cut some truck production in North America because of the ongoing global semiconductor shortage. The largest U.S. automaker said its Flint Assembly plant that builds the Chevrolet Silverado HD and GMC Sierra HD trucks will operate on one production shift the week of July 26. GM said its Ft. Wayne Assembly plant in Indiana that builds the Chevrolet Silverado 1500 and GMC Sierra 1500 model trucks will be idled next week. GM's Silao Assembly plant in Mexico that also builds the Chevrolet Silverado 1500, Cheyenne (for the Mexico market) and GMC Sierra 1500 will also suspend production next week. All three plants are expected to resume regular production the week of August 2. Related video: