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Hydraulic symbols for drawing schematics

http://www.wikiplc.com/index.php?option=com_content&task=view&id=31&Itemid=31

also, hydraulic forumlas: http://www.hydraulic-systems.com/pages/ref_formulas.htm
also, Introduction to Fluid Power: http://www.tpub.com/content/engine/14105/

also, MTH (austrian hobby hydraulics maker): http://www.modelltechnik.at/eindex.htm

Miscellaneous

Quadcopter robot bloopers

Building and fine-tuning robots is tricky work. For every video you see of something awesome there are several more never revealed of the near misses, bloopers, outtakes, and fails.

Have you got any video of robot outtakes? Share it in the comments.