If you're having outlining a design for your next rc project, look no further. Follow these links or download schematics for over 50 rc airplane designs here. Oh yeah, did we mention they're free? Check back often for updates and be sure to let us know if you know of any resources we've missed.
Probably the best source for free airplane schematics, including plans for an exceptional replica of the Boeing 777: RC Modeling Plans
Almost as good is Dave Fritz's R/C Plane Page. Many plans are converted to CAD.
Surprisingly, About.com actually has a pretty helpful article about building rc airplanes and helicopters. They also provide some downloadable .pdfs.
More model airplane plans can be found at the RC Airplane Advisor.
If you're looking for scale models, try this resource at RCPlanesLovers.com. Here you'll find plans for classic warbirds like the A-51 Mustang to floats you can land on water.
Have more site suggestions? I plan to continually update this page based on readers' suggestions. Email info@recreationaviation.com to suggest a site or just leave a message on our blog.