Here you can download free plans of radio-controlled quadcopter.
Remote control and Rubber [LifeHack]
How to Make Rc Model Airplane | DIY Twin 2200KV Brushless Motor
RC Plane Electronics & Connections for Beginners
The Best Drone for Beginners
How to build an rc plane (F-22 Raptor)
How to make RC Airplane - Part 3 - paint job / DIY
AWESOME A10 Thunderbolt RC PLANE! DIY
Hobby Plus CR-24 versus Hobby Plus CR-18 RC Car Crawlers! Does Size Really Matter?
Online calc of the CG of an RC airplane