I was looking at a 757 being loaded the other day and was wondering why Boeing made this a/c stand up so high off the ground. The 737 is bulk loaded and is able to be loaded and unloaded without the use of baggage belts and as the 757 is also bulk loaded I don't understand why they had to make it stand so high off the ground.
I was looking at the engines they do not seem any bigger than those on the 733/4//5/6/7/8 so didn't seem like they required the extra height for ground clearance, after all could they not have just flattened the bottom like they did on the 733 onwards if that was an issue and made the a/c lower to the ground ?.
I then thought about the extra height being required to give the tail more ground clearence on rotation due to the extra length of the a/c, but ruled this out due to the fact that the B739 is just about the same length but is still lower to the ground.
So my question, why did Boeing make the 757 so tall ?.