Blender import to unity3d goes wrong

[anon_56237120]

If I import something from blender to unity3D it works well, but when I tried to import my 3D airplane model today, it seems like the material of the outside is gone.
picture is attached >>
is anyone familiar with this problem and does anyone know how to fix this??

Thanks in advance

[bigkahuna]

Your normals are flipped. Go back into Blender and in the editor select all the polys and flip their normals.

[anon_56237120]

thnx !