Roadless wheel concept adjusts to all terrains

Graduate student Ackeem Ngwenya has combined the 6000 year-old wheel with modern materials to develop a new type of all-terrain wheel assembly that switches from narrow to wide tread at the turn of a screw. His Roadless wheel system, while envisioned for rural applications in his native Malawi, has the potential to be as big a change to road (and off-road) transport as was the introduction of anti-lock braking.We've all done it. Before embarking on a long driving trip on smooth-surfaced interstate highways or other roads of national importance, we'll raise the tire pressure to boost the gas mileage a bit. Stuck in the snow, mud, or sand? Let some pressure out of the tires to increase the contact area, while at the same time increasing the chances that the now floppy tire will grab hold. However, the benefits of trying to change the aspect ratio of a tire by simply changing pressure are rather minor, and often associated with a significant loss in tire lifetime.

The Roadless wheel concept is based on networks of compliant arches whose shapes vary with...

The Roadless wheel system attempts to throw out the limitations of a pneumatic tire by substituting a tread material wrapped around a pair of rod networks attached by an axle. The rods are adjusted using a mechanism reminiscent of a scissor jack.

The adjustment mechanism of a Roadless wheel is rather like that of a scissor jack (Image:...

When the disks on which the rods are mounted are far apart, the wheel takes the form of a wide tire of small diameter. When the disks are moved close together, the wheel becomes a narrow tire of large diameter. The proximate rods from the two disks are mutually attached to a fixed bearing (light blue circle).

A Roadless wheel adjusted to a variety of aspect ratios (Photo: Ackeem Ngwenya)

The tread of the wheel must be sufficiently compliant to adapt to the changing aspect ratio of the wheel, so is likely to be some form of elastomer.

Alternately, the wheel can include compliant members that directly form the shape and supporting mechanism for the tread, which can then be as simple as a sheet of rubber.

A Roadless wheel made of spring steel rods connected to an axle by movable mounts whose ad...

The video below tells the story of Roadless, and also shows more clearly how it adjusts to varying terrain. There are a host of variations of this basic idea, whose genesis was to make it easier for people living in rural Malawi to more easily deliver their goods to market. It does not seem likely that this concept will stop there.

Comments

Google to build green-roof California HQ

An image has been released of what looks set to become Google's new California HQ. Named Bay View, the nine-building campus is designed to maximize the likelihood of innovation-friendly chance encounters between the workforce. "You can't schedule innovation," Google's David Radcliffe tells Vanity Fair . "We want to create opportunities for people to have ideas and be able to turn to others right there and say, 'What do you think of this?'" This philosophy has fostered the design's angular office blocks, arranged back to back like nodding clergy. Despite the 1.1 million sq ft (102,000 sq m), employees will be a maximum of a 2.5-minute walk away from one another, Vanity Fair reports. Perhaps most remarkable is that this is Google's first build. In its 15-year history, Google has only ever occupied buildings previously used by others. "We've been the world's best hermit crabs: we've found other people's shell

Connectify Dispatch combines multiple internet connections into high speed bandwidth

Connectify, a company known for software that can turn your computer into a wireless hotspot, is at work on a new project called Dispatch that will turn all internet connections available to your device into one glorious (and hopefully faster and more stable) stream of high-speed bandwidth. The project appears to take some of its cues from live video broadcasting companies like LiveU , which sells custom made backpacks wired up with 3G/4G and Wi-Fi transceivers. These backpacks then spread the traffic load over whatever available networks it can connect to in order to maximize bandwidth, which is obviously a major plus if you're streaming live video. Dispatch, however, is planned as a software-only solution for the masses – no special backpack required. It will dynamically manage the traffic based on which networks provide the greatest bandwidth and have the clearest signal, which also means that even if one of the networks drops out entirely, you'll still have interne

Nerf Vulcan Sentry Gun tracks targets and avoids friendly fire

Anyone who plays video games will know that few things protect an area like a well-placed sentry gun. In the real world, though, even a person's bedroom or office could use a little protection sometimes, which is why one designer has built the Nerf Vulcan Sentry Gun. Using a custom program and some servos, the sentry can automatically locate targets and unleash a stream of foam darts at over seven times the usual speed, while keeping its owner out of the crosshairs. Britt Liv Ulrike Michelsen, a chemical and biological engineering student from Germany, designed and constructed the sentry using mostly basic electronics and some plywood. This isn't the first time she's modified a Nerf gun, but building this robotic turret is arguably her most ambitious project to date. Luckily, the Nerf Vulcan already operates using an electric motor, so controlling the actual firing mechanism through a computer was just a matter of connecting it directly to an Arduino Uno and a laptop.

ANBARASUASOKAN

Search This Blog