Engineering and Design
Paper prototyping for wireless robot
http://www-128.ibm.com/developerworks/wireless/library/wi-robot3/?ca=dgr-lnxw03RobotBuild
Lots of plans for a variety of projects
http://www.uniqueprojects.com/projects/other/missionbed/missionbed4.htm
Fluids
Airplane design - http://www.aeronutz.flyer.co.uk/
Water Rocket - http://ourworld.compuserve.com/homepages/pagrosse/h2oRocketIndex.htm
Structures
Electrical
Robot Car -
Heat
Communications