Aft Cargo Cabin Layout for Oversize Aircraft Loading
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Solution Overview
Problem
Existing aircraft fuselage configurations struggle to efficiently accommodate large or 'oversize' cargo without significant redesigns that impact aerodynamic drag, weight, and efficiency, leading to increased costs and performance losses.
Innovation Solution
An aircraft design featuring an aft cargo section with a lower deck floor and a rear access, such as a swing tail, allowing access to the aft cargo section from behind the fuselage, which accommodates larger cargo dimensions while maintaining minimal changes to fuselage surface geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the outer cross-sectional profile of the fuselage is changed to accommodate oversize cargo, then cargo capacity is improved, but aerodynamic drag increases and fuselage weight increases
Solution Approach 1:
The patent applies dimensionality change by creating a localized vertical expansion in the aft cargo section, lowering the deck floor to increase cargo height capacity without changing the overall fuselage cross-sectional profile. This allows oversize cargo accommodation while maintaining the original aerodynamic envelope, thus resolving the contradiction between cargo capacity and aerodynamic drag.
2Volume of moving object
If the outer cross-sectional profile of the fuselage is changed to accommodate oversize cargo, then cargo capacity is improved, but fuselage weight increases
Solution Approach 1:
The invention uses vertical dimensionality change within the existing fuselage envelope by lowering the deck floor in the aft section. This increases cargo volume without requiring additional fuselage material or structural reinforcement, thereby avoiding weight increase while accommodating oversize cargo.
3Volume of moving object
If the fuselage surface geometry is substantially changed to accommodate oversize cargo, then cargo capacity is improved, but implementation costs increase
Solution Approach 1:
The patent implements cargo capacity improvement through internal reconfiguration (lowering the deck floor) rather than external fuselage modification. This approach avoids costly redesign of the fuselage outer mold line and surface geometry, significantly reducing implementation costs while still accommodating oversize cargo.
4Volume of moving object
If the deck floor level is lowered in the aft cargo section, then cargo height capacity is improved, but fuselage structural complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the fuselage into distinct forward and aft cargo sections with different deck floor levels. This allows the aft section to have increased height capacity while the forward section maintains its original structure, thereby managing structural complexity through modular segmentation rather than requiring complete fuselage redesign.
Data Source
Figure 1
Figure 2~2B
Figure 3~3B
AI summary
An aircraft (10, 10") has an aft main cargo cabin (50) with a low deck floor (52), and a rear access (60) configured to provide access to the aft main cargo cabin from behind the fuselage (20). The deck floor of the aft main cargo cabin is lower than a first deck floor (32) of a forward main cabin (30) of a forward section of the fuselage. The aft main cargo cabin has a second height (H2) that is greater than the first height (H1) of the forward main cabin, allowing the aft main cargo cabin to accommodate oversize cargo with larger dimension(s). The aircraft may be built with such an aft main cargo cabin and rear access, or may be a modified aircraft that includes such an aft main cargo cabin and rear access. Related methods of reconfiguring a base aircraft into a modified aircraft having such an aft main cargo cabin and rear access are also disclosed.