I agree with Giraffe. I suspected as well that it was only due to airflow. The tilting of the rear engines doesn't make sense if you apply it to making the take off distance shorter and helping the aircraft lift. My reason for saying this is because if the #2 engines like those on the MD-11 and DC-10 were tilted up, then the downward pushing force behind the engine would actually try and push the rear end of the plane higher than the front end thus causing the plane to go nose down. Thanks for all of your replies.
"Bangkok Tower, United 890 Heavy. Bangkok Tower, United 890 Heavy.....Okay, fine, we'll just turn 190 and Visual Our Way