this one is easy, no fighting at all... firstly, make Wings and Propeller from rope saw, then go to Oslya. Go to the second cave from the left, or the third cave from the right. When you are in, find your way to the top of the mountain (I forgot the exact route, but it is not hard, just walk up stairs if there is one, if not return.). If you are at the very top of the mountain, you should see a scene when a plane crashed down in front of you. The pilot asks you for Wings and Propeller to fix his plane. Give them to him, and he gives you the Mighty Plane design!!!

NOTE: Dinos are not easy to fight, whenever you get into a battle you dont want to do, log off then log back on, this automatically escapes the fight, 100% successful rate!