how to make rc airplanes?

this question also includes what material to be used ,how to fix the motor

Your best bet to come make a 'real' RC airplane for the cheapest amount of money is to follow the instructions at
Re-design8 years ago
There are too many ways to answer your question.  Are you talking about gliders, rubberband powered, electric, glow or diesel?

RC planes can be build out of any light strong material.

Need to know what's wrong with the motor before we can fix it.

Go to this page and read, read, read and most of your questions will be answered.  When you as some questions that are more specific come back here and you can get those answered.