Slotted Wingtip Fins for Fixed-Wing Aircraft Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fixed-wing aircraft, particularly drones, face challenges in achieving increased static stability under high lift conditions while minimizing induced and parasitic drag, leading to power wastage and limited flight range, and require long take-off and landing runways with limited payload capacity.
Innovation Solution
The aircraft features slotted fins at its ends, angled between 0° and 45° relative to the vertical, with slots along the leading edge to generate a stabilizing vertical lift component, and a retractable spout or flap to manage drag, along with a vertical tailplane and inclined fins to enhance stability and lift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the lift is significantly increased using wing blowing techniques, then the lift is improved, but the angle of incidence varies and the horizontal stabilizer can no longer achieve its stabilizing function
Solution Approach 1:
The invention introduces vertical fins extending upward from the horizontal wingtips, adding a vertical dimension to the stabilizing structure. These fins with slots generate stabilizing moments in the vertical plane that counteract pitch variations caused by high-lift wing blowing, enabling static stability to be maintained under high lift conditions without compromising the lift enhancement.
2Loss of energy
If winglets are extended to reduce induced drag, then the induced drag is reduced, but the device complexity and manufacturing cost increase
Solution Approach 1:
The stabilizing function is segmented from the traditional horizontal stabilizer and distributed to vertical fins at each wingtip. Each fin with slots acts as an independent stabilizing element that reduces induced drag while maintaining simplicity in manufacturing and assembly, avoiding the complexity of conventional winglet designs.
3Ease of manufacture
If tactical fixed-wing aircraft are used to reduce cost, then the manufacturing cost is reduced, but the take-off and landing runway length increases
Solution Approach 1:
The slot fins pre-condition the airflow at the wingtips before stall occurs, maintaining attached flow and generating stabilizing moments that enable controlled operation at higher angles of incidence. This preliminary aerodynamic preparation allows the aircraft to achieve liftoff and landing at lower speeds, reducing the required runway length while maintaining cost-effective tactical aircraft design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances static stability, reduces power wastage, increases flight range, allows for a large payload, and requires shorter take-off and landing runways, while maintaining a compact design.
Implementation Method 1
The slot formed along the leading edge is oriented to circulate a flow of air through this slot from an external face of the fin to an internal face of said fin
Implementation Method 2
The lift of the aircraft is the force perpendicular to the direction of advance of the aircraft which is exerted on it to keep it in flight
Implementation Method 3
These fins reduce the drag induced by lift, without increasing the wingspan of the aircraft
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to an aircraft having at least one wing (5) including, at each end thereof, a fin (6) forming an angle of between 0° and 45° relative to the vertical. According to the invention, each fin (6) has a leading edge (7) that includes at least one slot (8) provided along said leading edge (7) and oriented so as to cause an air flow to flow via said leading edge (7) from an outer surface (6a) of the fin (6) to an inner surface (6b).