Those of you who enjoy building balsa models should check out these three websites for free, downloadable plans of a variety of WWI and later aircraft:
http://members.xoom.com/_XMCM/dlivesay/plansmain.html
http://members.nbci.com/gthunter/planpage/
http://www.flyingacesclub.net/alamo/plans.htm
The plans are for rubber powered flying scale models, but are easily converted to small electric or CO2 powered models , or to static scale.
Mike