My first attempt at building a tower crane from K'NEX.
Height from floor to mast: 200cm/79 inches; if not for ceiling height limitations, it would have been 215cm/83 inches tall
Jib span: 160cm/63 inches
Total span: 240cm/94.5 inches
Base diameter: 46cm/18 inches
Maximum load: approx. 1 lb (yes, it sucks; K'NEX was not designed to handle large loads without an excessive amount of pieces to support its own structure)
Counterweight: 111 red rods, 62 yellow connectors, 36 red connectors
Time used to build: Less than 3 hours
Words of caution:
-Make sure you are in a very large and/or empty room when building this.
-You may exhaust your red rod collection; be sure to have a lot of them.
-This is an ad-hoc model; it may or may not undergo further modification (such as adding string, trolley, motor, etc.).
- knex crane http://www.instructables.com/id/knex-crane/
- The LEGO inspiration: http://www.philohome.com/towercrane/tc.htm
- HowStuffWorks: http://science.howstuffworks.com/tower-crane.htm