Payload Basket
The Payload Basket was developed to satisfy the humanitarian aid requirements of the competition, which mandated the secure transport and precise delivery of road flares. Dropping uncontained payloads from flight altitude introduces significant risk and inaccuracy. To address this, our team engineered a winch-driven deployment system capable of lowering the payload basket while the aircraft maintained a stable hover.
I was responsible for the design and integration of the servo-controlled mechanism, which regulated drop timing for a more controlled, low-altitude delivery. The final architecture optimized volumetric efficiency, compactly housing the payloads and utilizing an integrated conveyor system to execute sequential drops.
Initial sketch
Collaborating within a structured team environment, I translated initial concepts into a functional, manufacturable assembly through the following development lifecycle:
Concept Evaluation: Reviewed and iterated on initial brainstorming sketches alongside the team lead to establish baseline requirements.
CAD Modeling: Utilized SolidWorks to model the main cylindrical chassis, establishing critical spatial constraints and mounting interfaces.
Mechanism Design: Evaluated multiple deployment methods, ultimately selecting a robust 3-belt conveyor configuration. Integrated commercial off-the-shelf (COTS) design elements, adapting snap-fit modular concepts for the conveyor rollers.
Component Integration: Designed dedicated internal partitioning around the base plate to securely isolate and protect electronic components.
Kinematic Optimization: Engineered a specialized conveyor ring assembly that mechanically links and drives all three belts simultaneously using a single servo, minimizing weight and system complexity.
Constraint Management: Modeled custom payload holders to securely retain the flares under dynamic flight loads prior to deployment.
STP file for 3D Printing
Additive Manufacturing: Fabricated structural components on Bambu 3D printers, utilizing PETG for high-stress structural areas and PLA for rapid prototyping and low-load enclosures.
Material Sourcing & Fabrication: Sourced custom rubber strip stock to manufacture bespoke conveyor belts, and procured precision hardware, fasteners, and actuation components from McMaster-Carr.
Conveyor belt test with servo tester
Mechanism Optimization & Pivot:
Evaluated the initial single-servo, 3-belt conveyor ring connector using a standalone servo tester.
Iterated through 3 ring design variations to resolve mechanical binding issues; ultimately determined the complex ring synchronization was a failure point.
Successfully pivoted to an independent, dual-servo and 2-belt system, significantly increasing mechanical reliability while streamlining assembly.
Volumetric & Weight Efficiency:
Downsized payload capacity from 3 to 2 units to optimize structural space constraints and reduce overall system volume.
Integrated hexagonal pocketing and truss geometries throughout the chassis to minimize component mass without sacrificing structural rigidity.
Rigid & Reliable Component Mounting:
Designed custom servo clamps to securely anchor the actuators and eliminate mechanical play under dynamic loading.
Simplified payload holder geometry to improve reliability, securing the holders directly to the conveyor belts.
Aircraft Interface & Retrieval Integration:
Incorporated dedicated guide holes for high-tensile fishing line to interface directly with the aircraft's winch system.
Integrated external structural pass-throughs for alignment netting, ensuring smooth, snag-free guidance as the basket is re-docked into the fuselage.
2-belt design
3-belt design
2-belt with weight reduction