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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.

GM recalling over 243,000 crossovers over possible seat belt defect

2010 Buick Enclave - Click above for high-res image gallery
The summer of 2010's recall hit parade continues unabated today, with General Motors having just announced that it is asking 243,403 owners of its 2009-2010 Lambda crossovers to bring their three-row haulers in for inspection. The culprit? Second-row seat belts in select Buick Enclave, Chevrolet Traverse, GMC Acadia, and Saturn Outlook CUVs have "failed to perform properly in a crash."
According to GM, a second-row seat-side trim piece is to blame, as it can impede the upward rotation of the buckle after the seat is folded flat. As a result, if the buckle makes contact with the seat frame, cosmetic damage can occur, potentially requiring additional force to operate the buckle properly. So far, no great shakes, but in the process of applying that additional force, the occupant may push the buckle cover down to the strap, potentially revealing and depressing the red release button. As a result of this, the belt may not latch, or in certain cases, it may actually appear to be latched when, in fact, it isn't.

Recharge Wrap-up: Chevy Volt class action suit proposed, Tesla stock could outperform in 2015

A class action suit has been proposed against General Motors for a steering problem in the Chevrolet Volt. The plaintiffs claim that a defect can cause the steering to freeze intermittently, and that General Motors either knows or should have known about the problem. The case, filed in New Jersey, also claims that defective parts are replaced with the same or similar parts, which are also defective. The plaintiffs say that claims for the 100-plus-member class exceed $5 million. Read more at Law360 or at BigClassAction. Tesla Motors stock (TSLA) has risen after weeks of losses. It gained 5.4 percent during the week ending December 19, when it closed at $219.29 per share. Since then, it rose slightly more, closing at $222.26 on December 24. Morgan Stanley lowered its target price on Tesla stock from $320 to $290, predicting lower sales on the upcoming Model III than expected before, but still called Tesla a good long-term investment. Analysts at CNBC predicted Tesla to be the best performing stock of 2015. Read more at ETF Daily News. Oslo- and New York-based architecture firm Snohetta has designed a zero-emissions house that also charges an electric car. The ZEB Pilot House, built in Larvik, Norway, uses a solar panel on the roof to power the house, which also provides enough excess energy to charge an EV. To make the most of energy most efficiently, the house uses smart technology to use as much energy as it can once it's harvested. This means one can turn on appliances like the washing machine remotely while the sun is at the optimum angle in the sky - perhaps during mid-day when the residents are at work. The house also uses organic materials and is designed to save as much energy as possible. Read more at Wired.