2.2.5. Fuselage

New propulsion concepts do not necessarily require a new fuselage design. A comparison of aircraft with similar passenger capacities in terms of the number of seats can be useful as demonstrated in the chart provided by [29]. Based on the integration of the fuel tanks and further system technologies, the dimensions of the fuselage could vary. A reasonable fuselage fineness ratio should be between 5.6 and 10 for regional aircraft, according to Roskam [17].

There are multiple approaches to maximizing cabin space; however, it is essential to weigh the balance between passenger comfort and space utilization in the design process [30]. With a market analysis, the current state of the art in cabin layout can be analyzed as well as new concepts, such as a windowless fuselage [31]. Nevertheless, the urgency for a regional aircraft design preferring passenger comfort over the use of space is not relevant. The major change to the fuselage is the integration of the fuel tanks, which is covered in more detail in Section 2.3.3.
