Blended wing body aircraft with a combustion engine and method of use

A method of use of a system for a blended wing body aircraft with a combustion engine, the method comprising:

• storing a fuel using at least a fuel source located within a blended wing body of the blended wing body aircraft, wherein the fuel source comprises:
• a multi-bubble fuel tank comprising at least a plurality of main lobes and at least four small lobes positioned on an outer perimeter of the plurality of main lobes, wherein each small lobe defines a varying volume from each remaining small lobes of the at least four small lobes, and wherein each junction of the multi-bubble tank comprises a continuous septum that partitions the multi-bubble tank into compartments and prevents fluid communication therethrough between the compartments;
• and
• an inner wall and an outer wall with a vacuum chamber disposed between the inner wall and the outer wall, wherein the outer wall comprises a reflective material;
• propelling the aircraft, using at least a propulsor mechanically affixed to the blended wing body aircraft, the at least at propulsor comprising a combustion engine;
• burning, at the combustion engine, the fuel from the fuel source;
• and
• producing, at the combustion engine, mechanical work to power the at least a propulsor.