Here you can download free plans for a foam rc plane.
How to make Micro Servo for RC Plane
DIY RC CARGO PLANE!!!
DIY SU-27 SUKHOI RC PLANE STYROFOAM
Building & Flying a 20lb Pumpkin plane!
Eachine E511S GPS Drone - MAVIC AIR 2?
HUGE RC Plane Under $100 Dynam Hawk Sky V2 Unboxing & Build Impressions - TheRcSaylors
How to make a powerful RC truck at home using cardboard
How To Make RC SU-27 With Brushless Motor
Online calc of the CG of an RC airplane