New Project - Cable-Stayed Bridge

I have begun to work on a K'nex cable-stayed bridge with what I hope to be a 25-30' center span. So far I have a prototype for one of the main supporting towers complete, but it turned out smaller than I had expected, falling 2' short of my plans. When completed, if all goes as planned, the bridge will measure over 60 feet long and be supported by 8 pillars (2 main towers, 3 smaller towers on either end).

Compact Model Rollercoaster

This is not K'nex, but it is still a building system so I decided to post it. I built this model roller coaster in one afternoon from about 700 pieces and contains about 25 feet of track which twists into three inversions, all barrel-rolls. The entire model fits onto a space only five feet long in between two bookshelves.

21 Foot K'nex Tower

This is a K'nex tower built by myself, Simon Olson and Sam Ihlenfeldt in a little over an hour. It measures 21 feet tall and only 3 inches wide, which could be a record for a height-thickness ratio but it would be too much work to validate that, this is just for fun. The ground the tower rests on is on a slight slant, and the tower collapsed 30 minutes after completion, nearly landing on a surprised biker! The tower has been moved to a more stable location where it remains standing.
The base of the tower is weighted down with bricks for stability.

K'nex Chair

This K'nex chair was built in about one week and can actually be used to sit in as it is capable of supporting over 300 pounds. The chair is supported by four legs and contains over 2000 pieces.

New Project - 2 story ball tower

I have started work on what will be my largest K'nex ball tower yet. The motorized lift will sit outside my house where it will take balls out from the side door and up through my window. From there the balls will wind through my house and down the stairs to the lift again. So far I only have the main lift support completed. The track will be modular so it can be assembled as quickly as possible. More pics coming later.

Edit: The ball tower is finished and can be viewed Here

Knex Computer - DONE

All 8 computational bits and the additional operand bit have been completed and the computer can now add and subtract numbers as large as 255, in less than 30 seconds, making it the most powerful, fastest and most compact k'nex computer in the world (to my knowledge). All of its functions are controlled by the "keyboard" at the bottom of the computer which are attached to the "RAM" (the long, dense bit along the very top) by long linkage rods. Video coming soon.

K'nex Computer reaches 5 bits

My K'nex computer is now more than halfway to completion with 5 fully functioning bits of cpu and memory, as well as 5 keys for keyboard input. I can now add and subtract numbers from 0-31, as well as simply have the machine automatically count up from 0-31 and then start over. At this rate my computer is doubling in power every day and should be completed sometime next week, having achieved 8x the computing power it has at the moment. In order for subtraction to function in binary I am required to add an additional bit, making 9 bits total, though this bit will not be as complicated as the other 8.