3.5.1. Fuselage

In order to keep the main focus of HAIQU on the propulsion technology, the cabin should not present any noticeable change for the passengers and operators. This results in a seamless integration in today's airport infrastructure for all non-fuel-related ground segments.

As shown in Figure 10, the layout consists of a four abreast seat arrangement per row with a single row of two seats on one side at the back. Boarding is conducted in the rear while the baggage is loaded in the front on the left side and on the back on the right side. The rest of the cabin layout is conventional.

The fuel tanks showcased in Figure 11 behind the cabin weigh a total of 300 kg. Concluding the design choices, the fineness ratio for the fuselage is 8.6. The cabin cross section is split into two parts, the upper, pressurized section is reserved for passengers and baggage, and the lower, unpressurized section is used for powertrain components, the TMS and the landing gear. This is shown in Figure 12.

**Figure 8.** Three-side view drawing of HAIQU.

**Figure 9.** 3D rendering of the HAIQU aircraft.

**Figure 10.** Cabin layout of HAIQU; twelve rows with four abreast, one row with two seats, space for baggage in the front and back and fuel tanks located behind the rear bulkhead.

**Figure 11.** Cross-sectional view of the rear fuselage section showcasing the fuel tank arrangement; venting line routed through the vertical stabilizer.

**Figure 12.** Cross-sectional view of the cabin section, showcasing the pressurized cabin and the unpressurized system compartment.
