hello everyone , anyone know any  software to make helicopter  3d design..

Sketch up 3d free is very good software for 3d design. There are many tutorials available online for making quadcopter using that software hope you may even find a helicopter.

thanks bro but i dowloaded it but it is unable to run..can u please send me its direct download link...? 

When you install it you get three icons. In that try to open sketchup 2016 .
It worked for me.
http://www.sketchup.com/
This is the direct link which will open up download page.

thanks bro..