Stories tagged engineering

May
17
2013

Solar plane: The plane Solar Impulse is making a cross-country trek over the USA.
Solar plane: The plane Solar Impulse is making a cross-country trek over the USA.Courtesy © Solar Impulse | Revillard | Rezo.ch
It's one flight down and four more to go for Solar Impulse, the completely solar airplane that's soaring its way across the USA. Solar Impulse flew from San Francisco to Phoenix on May 3, taking a shade over 18 hours to complete the trip. Over the next couple months, it will fly legs to Dallas, St. Louis, Washington D.C. and New York City with the New York trip scheduled to conclude in early July.

For the stat freaks, the solar plane averaged a speed of 40 miles an hour at an average altitude of 10,000 feet. It soared to a maximum altitude of 21,000 feet over the 650 mile trip. And yes, it took off and landed in the dark.

More information about the Solar Impulse project can be found at its website here and to follow its progress flying across the country.

So how does a solar airplane work exactly?

Made of carbon fiber, the plane has the wingspan of a Boeing 747 (208 feet) and the weight of a small car (3,527 lbs). It is the result of seven years of intense work by a team of about 80 people and 100 partners and advisors. The 12,000 solar cells built into the wing provide four 10 horsepower electric motors with renewable energy. By day the solar cells recharge lithium batteries which allow the plane to fly at night. Swiss pioneers Bertrand Piccard (chairman) and André Borschberg (CEO) are the founders, pilots and the driving forces behind Solar Impulse.

The plane made its first night flight in 2010 and has a record endurance flight of 26 hours, 10 minutes, 19 seconds.

Solar Impulse wants to inspire and motivate as many people as possible throughout its journey across America. “We want to show that with clean technologies, a passionate team and a fa-reaching pioneering vision one can achieve the impossible.” said Piccard, adding “If we all challenged certitudes by driving change and being pioneers in our everyday lives, we can create innovative solutions for society’s biggest challenges.”

Here's some more nitty gritty about the plane's specs and future:
• The electricity produced by the solar panels is about the same as needed to run a scooter for 24 hours.
• The light plane is sensitive to turbulence. Winds cannot exceed 11.5 miles per hour at take off and crosswinds at takeoff can be no more than 4.6 miles per hour.
* A second plane is now being constructed.
* Solar Impluse has a goal of making an around-the-world trip in 2015, with 2-3 day flights over continents and 4-6 day legs over oceans.

And just to prove it actually flies, here's video shot in the San Francisco skies before Solar Impulse began its USA journey.

May
02
2013

Non-robotic jellyfish: Engineering researchers at Virginia Tech are building robots that mimic the efficient way jellyfish get around.
Non-robotic jellyfish: Engineering researchers at Virginia Tech are building robots that mimic the efficient way jellyfish get around.Courtesy Andy Field (Field Offie)
Researchers at Virginia Tech are working on several versions of robotic jellyfish that someday could be used by the military, or for mapping the ocean floor, or cleaning up oil spills.

Known affectionately as RoboJelly, the silicone blobs range from the size of a baseball to a giant five-foot floating monster. Each mimics the swimming technique used by jellyfish, those huffing and puffing water-bags that populate the world's oceans.

In nature, most jellyfish propel themselves by the seemingly simple expansion and contraction of their umbrella, using it to push water out like a rocket blast that propels it forward. But the fluid dynamics are a little more complicated than than just expelling out a big blast of water and moving the other way. It's more like when your cigar-smoking uncle would blow smoke rings into the air to impress you. Remember that? I do. These are called vortex rings, and it's the efficiency of the hydromedusean's self-created fluid flow that interest the VT researchers.

Students at VT's College of Engineering use thin layers of silicone - the same material used for swimming masks - to construct the robots. Electric batteries in watertight plexiglass boxes are used to power the mechanical blobs. The researchers are also looking into ways of extracting hydrogen from water to power them.

“Nature has done great job in designing propulsion systems but it is slow and tedious process," said Shashank Priya, associate professor at Virginia Tech, and the project's lead researcher. "On the other hand, current status of technology allows us to create high performance systems in a matter of few months.”

The on-going project involves a number of U.S. universities and industries, and will warrant several additional years of research before any prototypes are released for use. Besides possible military application, RoboJelly could be employed for such things as monitoring ocean currents and conditions, cleaning up oil spills, and studying sea-bottom flora and fauna.

SOURCES
Story at EarthSky.org
Virginia Tech website

Here's a long, but very inspirational, report on a 14-year-old Michigan girl who is rebuilding a Pontiac Fiero car all on her own. Her goal, to drive it on her 16th birthday.

Apr
27
2012

Beaker & Brush
Beaker & BrushCourtesy Science Museum of Minnesota
A few weeks ago I attended the Beaker & Brush Discussion in St. Paul, a public event about the intersection of science and art put on by the Science Museum of Minnesota the second Tuesday of each month. April’s topic was titled "Why We Collect", a discussion about why we as a society and as individuals like to collect things. Museum staff members were on hand to relate the museum's and their personal perspectives on the nuts and bolts of collecting. The subject particularly interested me because ever since I was a kid, I’ve collected stuff. Things like rocks and fossils, silent movie posters, space memorabilia, historic Duluth material, and early paleontology ephemera – I’ve collected them all. Lately it’s been dinosaur-related postcards. I got interested in collecting those because I designed some dinosaur postcards sold here at the museum gift shop, which, you know, I think is kind of cool. I like how it connects me to the long history of dinosaur postcards, which goes back quite a while. The two oldest cards in my collection date back before 1910. Both are related to industrialist Andrew Carnegie’s namesake dinosaur, Diplodocus carnegiei, which he had spared no expense extracting from the High Plains of Wyoming for his museum in Pittsburgh. Carnegie was so proud of his collection of bones that he had several mounted casts of the great sauropod created that he presented to heads of state in many countries around the world.

Field Museum postcard: reproduction of paleo-artist Charles R. Knight's "Flying and Swimming Reptiles" mural.
Field Museum postcard: reproduction of paleo-artist Charles R. Knight's "Flying and Swimming Reptiles" mural.Courtesy Mark Ryan collection
This brings me to a recent postcard I saw on eBay from the Field Museum of Natural History. The card showed a sepia-toned reproduction of one of paleo-artist Charles R. Knight’s murals. Knight was (and still is) a highly regarded natural history artist known for his exceptional talent at bringing long-extinct animals to life in his fantastic paintings. This one showed flying and swimming reptiles in the Cretaceous sea that once extended across the middle of the North American continent. Knight created the original painting (along with 28 others) between 1926 and 1930 for the Field Museum exhibits in Chicago, where they can still be seen today. A color reproduction of the same painting portrayed in the postcard also sets beneath the mosasaur skeleton seen at the Science Museum of Minnesota. Knight, by the way, was my grandmother’s maiden name. She was born in London, as was Charles Knight’s father, so I like to think that somewhere in the past, we might share a family connection.

Reverse of Field Museum postcard: the addressee and address are significant.
Reverse of Field Museum postcard: the addressee and address are significant.Courtesy Mark Ryan Collection
But beyond that, I like Knight’s images and have several in my collection, so even though this postcard wasn’t actually of dinosaurs per se (dinosaurs didn’t fly or live in water), I considered bidding on it. But what clinched it for me was the address on back of the postcard. The reverse side, which the seller included in his listing, displayed a 1932 postmark and was addressed to Mrs. Cornelius Vanderbilt at 640 Fifth Avenue in New York City, an address with which I happened to be familiar.

Let me explain the connection.

Old quarry in Barryville, New York: stone from here was used for pavement in Manhattan.
Old quarry in Barryville, New York: stone from here was used for pavement in Manhattan.Courtesy Mark Ryan
A couple summers ago, we went to visit my son, who at the time was living in upstate New York. He and his girlfriend were living in Barryville, a small hamlet in the Catskills on the Delaware River about 100 miles northwest of New York City. They were renting a place for the summer with another couple on an old farm and quarry once owned by a man named Hickok. The site contained three residences, two for rental and another used by the property owners. It was a very quaint and idyllic setting, surrounded by woods, with the three buildings close together on the property and set before a steep wall of quarry rock where a small waterfall tumbled over one corner.

The rock in the quarry, I discovered, was primarily sandstone (or more precisely a feldspathic greywacke) of Devonian age, and the largest bedrock unit of the Catskill formation. Deposited in a delta environment during the Acadian orogeny (ancestral Appalachians Mountains) about 360 million years ago, it’s essentially the same rock that underlies the Pocono Mountains to the south in Pennsylvania. The rock unit was first quarried in Ulster County, New York and became known as bluestone because of its color at that location but the stone can come in several hues – in Barryville it’s red. Over the years, the rock has been heavily quarried as an architectural and building stone because of its durability, resistance to weathering, and how easily it splits into slabs. Today, the term “bluestone” is a commercial designation rather than geological and can include many kinds of rock used for building.

One evening the owners related to me how some of the rock quarried behind their house had been used to pave the sidewalks of New York City, and in fact back in the late 19th century, the house they lived in had been moved several yards toward the river so quarrymen could get at one very large, continuous slab of rock. Once removed, the single slab was shipped by barge over the Delaware & Hudson Canal and down to NYC for placement in front of the Vanderbilt Mansion on Fifth Avenue. The Vanderbilt name is practically synonymous with “filthy rich”, at least back then during the Gilded Age. I enjoy history and geology so the story intrigued me, and later that evening I went online to see what I could find out about the story.

William H. Vanderbilt's Twin Mansions: William H. lived in the nearer building (640 Fifth Avenue) while his two married daughters and their families lived in the 642 Fifth Avenue address which was divided into two residences.
William H. Vanderbilt's Twin Mansions: William H. lived in the nearer building (640 Fifth Avenue) while his two married daughters and their families lived in the 642 Fifth Avenue address which was divided into two residences.Courtesy Public domain
It didn’t take long at all to come across this 1881 clipping in the New York Times archives that describes, in detail, getting the massive 25-foot rock from Barryville to NYC and placed in front of the William H. Vanderbilt mansion being built on Fifth Avenue between 51st and 52nd Streets in Manhattan. If by now you guessed that the address was 640 Fifth Avenue, you’d be right (actually William H. Vanderbilt built two identical mansions at the same time on the block, one for himself - the 640 address - and another at 642 Fifth Avenue that was divided into two residences for his two daughters and their families).

The Commodore and son: Cornelius Vanderbilt, aka "The Commodore" and patriarch of the family, constantly berated his oldest son when William was growing up, referring to him as incompetent and a blockhead. It wasn't until later in life that William proved him wrong, finally convincing his critical father that he was capable of taking on the family railroad business and other interests. William subsequently inherited the bulk of his father's millions and doubled it during his own lifetime.
The Commodore and son: Cornelius Vanderbilt, aka "The Commodore" and patriarch of the family, constantly berated his oldest son when William was growing up, referring to him as incompetent and a blockhead. It wasn't until later in life that William proved him wrong, finally convincing his critical father that he was capable of taking on the family railroad business and other interests. William subsequently inherited the bulk of his father's millions and doubled it during his own lifetime.Courtesy Public domain via Wikipedia
William Vanderbilt’s father, Cornelius “The Commodore” Vanderbilt, had amassed the family fortune via shipping and railroad interests in the mid-1800s, rocketing the ultra-wealthy Vanderbilts to the very stratospheric top layer of the socio-economic heap. To put their vast wealth in perspective compare the Commodore’s $100,000,000 (an inheritance that William Vanderbilt doubled) to the guys who led the mules that pulled the canal barge transporting William’s monster sidewalk slab. They’d have to walk 15-20 miles a day, tend to the mules, and pump out the barges – all for about $3 a month! Even the other wealthy families of the time (i.e. Astors and Carnegies) paled in comparison to the House of Vanderbilt. The extended Vanderbilt clan owned several properties along Fifth Avenue but William Vanderbilt’s Triple Palaces, as they were also known, would be the finest along Vanderbilt Row.

Nine-foot Malachite Vase: The ornate Neo-classical vase made of the mineral malachite stood in the vestibule of William H. Vanderbilt's Fifth Avenue Twin Mansions. This is one of two matching urns originally created for Czar Nicholas of Russia. He presented one to Count Demidoff, and Vanderbilt purchased it from his estate in 1880. It now resides at the Metropolitan Museum of Art. Its twin can be seen at the Hermitage in St. Petersburg, Russia.
Nine-foot Malachite Vase: The ornate Neo-classical vase made of the mineral malachite stood in the vestibule of William H. Vanderbilt's Fifth Avenue Twin Mansions. This is one of two matching urns originally created for Czar Nicholas of Russia. He presented one to Count Demidoff, and Vanderbilt purchased it from his estate in 1880. It now resides at the Metropolitan Museum of Art. Its twin can be seen at the Hermitage in St. Petersburg, Russia.Courtesy Public domain
For nearly two years, six hundred laborers (including 60 sculptors and artisans from Europe) toiled on William H. Vanderbilt’s 640 residence, creating a brownstone behemoth which he filled with extreme opulence, including over 200 original pieces of art now in the Metropolitan Museum of Art. According to a book about the mansion published privately by Vanderbilt, everything inside "sparkles and flashes with gold and color...with mother-of-pearl, with marble, with jewel effects in glass...and every surface is covered, one might say weighted, with ornament." The gigantic five-story oblong pile of stone and marble contained seventy rooms - “most of them huge” - and 33 bathrooms. Many of the dozens of servants lived on site, maids on the 5th floor and attic, manservants in the sub-basement. One employee’s only job was to keep the building’s furnaces stoked with coal.

The Picture-Gallery: William H. Vanderbilt privately published a catalog detailing the art and architectural treasures found at his 640 Fifth Avenue mansion. Much of his artwork collection was later donated to the Metropolitan Museum of Art.
The Picture-Gallery: William H. Vanderbilt privately published a catalog detailing the art and architectural treasures found at his 640 Fifth Avenue mansion. Much of his artwork collection was later donated to the Metropolitan Museum of Art.Courtesy Public domain
When he died in 1885, William H. Vanderbilt was the richest man in the world (at a time when the US had no income tax!). The mansion at 640 was willed to his brother, George Vanderbilt (who also built a giant 125,000 acre estate in Ashville, North Carolina, called Biltmore), and when George died in 1914, the huge house with the pavement stone from Barryville passed down to Cornelius Vanderbilt III and his wife, Grace Wilson Vanderbilt, the postcard’s addressee.

Mrs. Cornelius Vanderbilt: born Grace Graham Wilson in 1870, she became New York's leading socialite after her marriage to Cornelius Vanderbilt III.
Mrs. Cornelius Vanderbilt: born Grace Graham Wilson in 1870, she became New York's leading socialite after her marriage to Cornelius Vanderbilt III.Courtesy Public domain
Grace Wilson Vanderbilt was the darling of European royalty, and for many years New York’s leading socialite. Her marriage to Cornelius III caused him to be disinherited by his father (Cornelius II) and ostracized by many of the other Vanderbilts. (When his father died, rather than getting $60-$70 million, Cornelius III (nicknamed Neily), inherited only half a million dollars plus income from a million dollar trust fund. His brother Alfred threw another $7 million his way to somewhat even the score). Grace’s own father, Richard T. Wilson, was a New York banker of great wealth and close friends with Andrew Carnegie, but the Vanderbilts, for whatever reason, considered her a social climber. Despite the family animosity, Grace managed to make herself the Mrs. Vanderbilt, the family’s last grand dame of the social set. (An article in the November, 1905 Munsey’s Magazine stated Grace had attained her social status by learning “the art of success scientifically, from approved models” – meaning all the European royalty she met as a young girl). During her reign, Grace hosted huge dinner parties, usually twice a week, and even larger, lavish balls for a thousand guests (I guess this is when having 33 bathrooms comes in handy). She once claimed to have entertained 37,000 guests in a single year. Neily wasn’t as interested in his wife’s social activities. As a boy he longed to be a scientist, and graduated from Yale a mechanical engineer. He was also an expert sailor and career military man. When he wasn’t yachting or soldiering he’d spend his time creating various railroad improvement devices for which he owned several patents, or co-founding businesses like the Interborough Rapid Transit Company (IRT), New York’s very first subway system.

Postcard inscription: "Dearest Grace, I can't tell you how sorry I was to miss you. I tried to telephone but you were out. Many thanks for the lovely box of candy. We are all enjoying it. You were a dear to think of us. Much love from us all. Eleanor"
Postcard inscription: "Dearest Grace, I can't tell you how sorry I was to miss you. I tried to telephone but you were out. Many thanks for the lovely box of candy. We are all enjoying it. You were a dear to think of us. Much love from us all. Eleanor"Courtesy Mark Ryan Collection
So back to the postcard. The fact it had been addressed to the Vanderbilt mansion where the big sidewalk slab from the Barryville quarry ended up was enough to make it desirable to me, so I bid on it and won it. While waiting for its arrival in the mail, I looked more closely to the card’s inscription: a social regret and thank you for a box of candy to Grace signed simply “Eleanor”. This intrigued me, and investigating it further, I eventually came to the realization that the writer was Eleanor Roosevelt.Eleanor Rooselvelt
Eleanor RooselveltCourtesy LIbrary of Congress
At the time her husband Franklin Delano Roosevelt (we share birthdays!) would have been governor of New York, and within 8 months become the president-elect of the United States. Now that was something. The card was cancelled with a St. Paul & Williston RPO postmark (railroad post office – my grandfather worked the Chicago-St. Paul leg). Eleanor could very well have been west visiting her nephew, Teddy Roosevelt, Jr. at the Field Museum. Like his father, TR - the former president - Teddy Jr. was a naturalist and explorer. Perhaps Eleanor was in Chicago to attend a memorial service for William V. Kelley who had fully financed her nephew’s 1929 Asian expeditions (Kelley-Roosevelts Expedition) for the natural history museum. Kelley had just died days before the postmark date.

Grace Vanderbilt was close friends with Alice Roosevelt, TR’s daughter, and Teddy, Jr’s half-sister, and obviously knew Eleanor, although, later, she and Neily would be vocal opponents of FDR and his New Deal recovery program, which they thought were socialistic. Sounds familiar, does it not? (Neily even called the president a traitor to his class). Of course the Great Depression had little effect on the Vanderbilts or their friends. The House of Vanderbilt’s range was widespread. Besides the Fifth Avenue mansions (and a boatload of private yachts), family members owned several summer homes in Newport, Rhode Island (e.g The Breakers, Marble House, and Grace and Neily’s Beaulieu. At Hyde Park, New York, a Vanderbilt mansion combines withFDR’s birthplace, and Eleanor Roosevelt’s getaway Val-Kill, to form the National Park Service’s Vanderbilt-Roosevelt National Historic sites. .

So, why do people collect things? According to this informative site, it can be for a number of reasons. Personally, I think I do it for several of the reasons listed: it connects me with memories of my youth or to some place I’ve visited, or just hooks me in with something that fascinates me. I know when I’m in the heat of my obsession - whatever that may be at the time, I find it difficult to part with any of my collection. Sometimes I’ll sell a lesser item to acquire something better, but that’s the exception rather than the rule. At some point my interest flags and I sell or give away most of the collection and move on to something else. But I find no matter what I collect, it often triggers an intense desire in me to find out as much as I can about it. Like this Vanderbilt postcard. Because of one silly postcard and a giant slab of sandstone, all these odd historical, geological, architectural, political, and socioeconomic connections have been brought together here. It makes for a good story anyway.

Titanic disaster in 1912: George Vanderbilt and his wife changed their plans to sail aboard the doomed vessel.
Titanic disaster in 1912: George Vanderbilt and his wife changed their plans to sail aboard the doomed vessel.Courtesy Public domain via Wikipedia
I’ll end with one last anecdote. With all the interest this month with the 100th anniversary of the sinking of the Titanic, there’s a Vanderbilt connection to it. In April of 1912, George Vanderbilt and his wife – the second owners of the 640 Fifth Avenue mansion - were in Europe and had booked passage on the maiden voyage of the Titanic. But George’s mother-in-law expressed a very strong premonition and convinced them to make other plans. Lots can go wrong on maiden voyages, she said. Lucky for them, they followed her advice and removed their luggage from the doomed liner and made the trip back on its sister ship RMS Olympic instead. George’s footman, Frederic Wheeler, however wasn’t as lucky. Wheeler remained on the Titanic and perished in the disaster.

ADDITIONAL SOURCES
Queen of the Golden Age by Cornelius Vanderbilt IV, McGraw-Hill, 1956
Beetlehead’s 640 Fifth Avenue (excellent blog)
Mrs. Cornelius Vanderbilt, Munsey’s Magazine, Nov. 1905
Vanderbilt home and info on Flickr

Apr
13
2012

The ATV-2: The astronauts filled it with trash, and then burned it. But, to be fair, they probably ate that trash several times before they finally tossed it.
The ATV-2: The astronauts filled it with trash, and then burned it. But, to be fair, they probably ate that trash several times before they finally tossed it.Courtesy NASA
I am adding a’s to the end of words to make them sound a little like “NASA.” Try it. It’s funa.

Anywaya, I thought I’d run a little idea I had by y’all.

I got trash. Who doesn’t? You use stuff, you make trash, and it just piles up. Under your couch, in the freezer, on top of the cat … what are you supposed to do with it? Put it on the curb? I guess, but what’s exciting and easy about that? So, my idea—which I got from the world’s various space agencies—is to take my trasha up to the roofa of my apartment building (three stories!!) and just drop it. If I’m at all accurate in my understanding of acceleration and atmospheric friction, all those Sears catalogues, plastic cups, and mouse skeletons should burn up before they hit the ground.

I mean, it’s what NASA, the European Space Agency and all of their ilk do, and it seems to work for them. Take the ESA’s recently launched ATV-3 (Automated Transfer Vehicle-3). The large, unmanned space capsule will deliver about 7 tons of cargo to the International Space Station (a few hundred pounds of food, water and oxygen, and about 6.5 tons of candy), stay docked for 4 to 6 month while the astronauts use it like a missing roommate’s walk-in closet, and then, once it’s completely full of trash, it will detach, fall towards Earth, and incinerate in the atmosphere. Easy peasy. Easya peasya.

Despite it being what I think is an elegant solutiona to waste accumulationa, there are plenty of folks out there, who may or may not be smarter than hundreds of NASA systems engineers, that believe this proves that astronauts are the worst recyclers ever. To this, I have three things to say:

1) You’re no fun.
2) Think about the fuel it takes to get those tons of junk into space. You’re worried about the waste that happens after that?
3) Wrong! In a lot of respects, astronauts on the ISS are the best recyclers in the histories of re and cycling.

See, here’s the thing about #3: astronauts may dump their candy wrappers, dead pets, banana peels and old undies (JK, they wear those undies for months) into a fiery and unforgiving atmosphere, but there’s a lot of stuff that they re-use again and again that you’d never even think of. Air, for one. And water.

When you’re breathing, farting, sweating and peeing for months on end in an airtight box floating in space, and a fresh glass of water costs between $10,000 and $15,000 for delivery, you have to be clever.

And the engineers of the ISS are clever! Consider the Environmental Control and Life Support System. Astronauts, like most of us, breath out poisonous carbon dioxide, fart out poisonous methane and sweat out poisonous ammonia. ECLSS filters out all of that to produce fresh air again. The system also splits water molecules apart to create breathable oxygen, and reclaims moisture from urine and other waist to produce more water for drinking (or ultimately breathing). I don’t know about you, but I rarely save my farts, sweat, breath and urine, much less reuse them.

All things considered, I think the ISS has a pretty sweet setup figured out. A two hundred and fifty mile trash drop-n-burn (awesome), and a system that can recycle pretty much anything that comes out of your body (also awesome). The rest of us should be so luckya.

Carl J.E. Eliason of Saynor, Wisconsin Standing Next to His Snowmobile Prototype
Carl J.E. Eliason of Saynor, Wisconsin Standing Next to His Snowmobile PrototypeCourtesy Carl Eliason Family
84 years ago from today, on November 22, 1927, the first U.S. patent for a snowmobile (No. 1,650,334) was awarded to Carl Eliason of Saynor, Wisconsin. Carl was an auto mechanic, blacksmith and general store owner, and he loved the outdoors. However, he struggled with a foot deformity that made it difficult to use skis or snowshoes. So he built a lightweight personal machine that could follow the narrow ski and snowshoe trails made by his friends. His "motor toboggan" had ski-like front runners controlled by a rope, a rear drive track fashioned with bicycle sprockets and chains, wooden cleats, and was powered by a 2.5-horsepower outboard motor.

Today, snowmobiling provides a winter recreational activity enjoyed by many worldwide. For years, snowmobiles had a history of noise pollution, high emissions, and poor fuel economy. However, with the implementation of the U.S. EPA's reduced emissions program phases scheduled for completion in 2012, and rising cost in fuel prices, snowmobile enthusiasts and manufacturers are now seeking ways to make snowmobiles more eco-friendly and fuel efficient. Two-stroke engines used in motorcycles, snowmobiles, chainsaws, and marine outboard motors are not as efficient as their four-stroke counterparts, but they are lighter, less complex, and easier to manufacture. Many groups are manufacturing exhaust trapping systems that dramatically reduce EPA-regulated emissions such as carbon monoxide, hydrocarbons, and NOx.

Peter Britanyak of the University of Idaho's Department of Mechanical Engineering prototyped the idea of Synchronous Charge Trapping (SCT) on a two-stroke snowmobile engine as part of his thesis for a masters degree. A second generation prototype was created by Team SHORT CIRCUIT of the University of Idaho, and a preliminary patent has been issued.

Other designs have been manufactured through the Society of Automotive Engineers (SAE) Clean Snowmobile Challenge. In 2010, Minnesota-based manufacturer Polaris Industries teamed with University of Wisconsin-Madison to win the 2010 Clean Snowmobile Challenge. Next year, a record number of teams are expected to participate in the SAE 2012 Snowmobile Challenge, scheduled for March 5-10, 2012 at the Keweenaw Research Center of Michigan Technological University.

And research from snowmobiles and off-road vehicles is being applied to space exploration as well. Earlier this year, Quebec-based manufacturer Bombardier Recreational Products Inc. (BRP) announced that they are contributing to Canadian exploration programs of the moon and Mars. BRP will develop the chassis and locomotion systems for a Lunar Exploration Light Rover and a Mars Exploration Science Rover, from contracts awarded by the Canadian Space Agency.

I'm on a roll, now. Science Friday
Science FridayCourtesy Science Friday
"Water striders don't really stride, they row on the water. But their legs are spindly and don't seem good for paddling. David Hu, mechanical engineer at Georgia Tech, wanted to understand the basic physics of how water striders glide. By filming them stride on food coloring and building his own robotic strider, he found out that the secret to the stride is in the paddle."
OK, it's Monday, not Friday, but last week's Science Friday video is too cool to skip. Without further ado... Science Friday
Science FridayCourtesy Science Friday
"Maxwell von Stein, a 22-year-old graduate of The Cooper Union, built bicycle that uses a flywheel to store energy. Instead of braking, Max can transfer energy from the wheel to the flywheel, which spins between the crossbars. The flywheel stores the kinetic energy until Max wants a boost, then he can transfer the energy back to the wheel using a shifter on the handlebars."

It's Friday. Yes, I know I missed it last week. But it's time for a new Science Friday video.

Science Friday
Science FridayCourtesy Science Friday
This week,
"The latest on the bug beat: To survive floods, fire ants band together to form a raft. They can sail for weeks. But how does the raft stay afloat? Researchers report the answer in PNAS this week. Plus, engineers at Tufts are looking to the caterpillar for inspiration for soft-bodied robots. The problem is that squishy bodies make it difficult to move quickly--but some caterpillars have developed a workaround."