Amphibious large aircraft without airstairs

A large amphibious aircraft without airstairs, comprising:

• a fuselage;
• a pilot compartment;
• one or more airfoils;
• one or more empennages;
• one or more engines;
• one or more undercarriages;
• and
• one or more vertical lift propeller devices in an ordered assembly;
• wherein the pilot compartment protrudes from the fuselage;
• longitudinal sections of the fuselage are in a shape of sections of the airfoil;
• the one or more airfoils extend to two sides from an airfoil assembly center at a center top section of the fuselage;
• wherein the one or more engines are mounted on the fuselage and near the empennage;
• all the undercarriages are mounted in a passenger cabin;
• the one or more vertical lift propeller devices are mounted at each of two rear corners of the fuselage;
• wherein two front undercarriage bays and several main landing gear (MLG) bays are mounted in the fuselage;
• front undercarriages are mounted within the front undercarriages bay;
• MLGs are mounted within the MLG bays;
• all the front undercarriages and the MLGs are vertically retractable;
• each of the front undercarriage bays and the MLG bays is mounted with a sliding door;
• and
• wherein the one or more vertical lift propeller devices are each formed by orderly assembly of the one or more engines in a cargo hold, a stationary gearbox, a movable gearbox, and propellers in a propeller chamber;
• the propeller chamber is mounted with front and rear sliding doors.