New York City’s L train carries about 400,000 passengers a day, linking Manhattan and Brooklyn and bringing passengers along 14th Street, under the East River, and through the neighborhoods of Williamsburg, Bushwick, Ridgewood, Brownsville, and Canarsie. About 225,000 of these passengers pass through the Canarsie Tunnel, a two-tube cast iron rail tunnel built below the East River between Manhattan and Brooklyn in 1924. Like many other New York City road and subway tunnels, the Canarsie Tunnel was badly damaged when Hurricane Sandy’s storm surge inundated the tubes with million of gallons of salt water. Six years later, the impending closure of the tunnel is motivating New Yorkers to develop their own ambitious infrastructure ideas.
After the break you can see a video of the rig gracefully navigating a local pond, along with a raft of ducks. It’s quiet enough not to startle them, which is nice. We don’t get a good look at the propulsion system, but [Vimal Patel] calls the floats “hockey bottles” in his Flickr comments. They appear to be Lego themed and we’re wondering if they are some type of packaging for a small set that doubles as a sports drinking bottle once the pieces are removed? The rig includes a camera which provides a great persepcive very near the water level.
This isn’t his only floating creation. He’s got a second rig that was used to film some of the footage of this one.
[Kevin Sandom] built this boat using a radio controlled toy car. The two pontoons are recycled from Styrofoam packaging material using some thick wire to connect them and provide a framework for the propulsion and control circuitry. The motor itself is a hobby outboard, which really only required [Kevin] to develop a method for steering. He walks us through the build process in the video after the break, where we find out that the original toy has a pretty bad design flaw. It seems the car used four AA batteries to drive the motor, but one of the four batteries was also used separately from the other three to power the control circuitry. Running that battery down faster than the others shortens the life of the whole.
This is considerably easier than the underwater ROV hacks we’ve seen before. We do think that it would make for a fun weekend project, and we’d bet you’ll get some weird looks for piloting what appears to be garbage around a pond.
We do a lot of useless hacks just for the fun of it so when we see something with purpose it’s pretty exciting. This hack turns any kayak into a motorized vessel that can be controlled by a quadriplegic person using a sip & puff interface. After the break you can see some clips of navigation and an explanation of the hardware.
[Mark’s] system starts by adding outriggers to a kayak to prevent the possibility of the boat rolling over in the water. Each pontoon has an electric trolling motor attached to it that is controlled by an Arduino via a motor driver.
The Arduino takes navigational commands from a sip & puff controller. A straw in the operator’s mouth allows them to sip or puff for a split second to turn left or right. Longer sips or puffs control forward and reverse incrementally, up to a top speed of about 3.7 miles per hour. [Mark] incorporated an auxiliary remote control interface so that a safety observer can take control of navigation if necessary.
His build came in around $1300, a tiny cost if this makes kayaking available to several people each summer. Great job [Mark]! Continue reading “A day at the lake for the disabled”