TorPropel Objectives
TorPropel pursues five interconnected objectives to bring toroidal propellers from concept to demonstration. First, the project optimises the scaled-up toroidal geometry, targeting propeller diameters of up to 1.7 metres, through computational fluid dynamics (CFD) and iterative optimisation algorithms, aiming for over 25% improvement in thrust efficiency and more than 15 dB noise reduction. In parallel, the consortium develops bespoke vitrimer-based carbon fibre prepreg tapes that combine aerospace-grade mechanical performance with intrinsic recyclability, and pioneers an automated Rapid Tow Shearing (RTS) manufacturing process capable of producing complex geometries. To ensure operational safety and reduce maintenance costs, TorPropel integrates embedded structural health monitoring (SHM) systems directly into the propeller structure, enabling real-time condition assessment through advanced sensing and wireless data transmission. Finally, the project establishes a comprehensive framework for propeller repairability and recyclability through lifecycle analysis, targeting over 95% material recovery, supporting the aviation industry's transition toward circular economy practices.

Technology Approach
Geometry Optimization
The project applies Computational Fluid Dynamics (CFD) modelling, including DES and LES simulations, to analyse flow behaviour, assess aeroacoustic performance, and optimise toroidal propeller geometry.
Composite Material Development
TorPropel develops vitrimer-based thermoset composites with intrinsic repairability, reprocessability, and recyclability for use in propeller manufacturing.
Automated Manufacturing
Rapid Tow Shearing (RTS) technology is adapted to enable controlled fibre placement and improved material utilisation in complex composite structures.
Structural Health Monitoring
Embedded sensing technologies enable real-time structural monitoring and support predictive maintenance of composite propellers.

Work Plan
TorPropel consists of:
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WP1: Specifications & Requirements
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WP2: Design Optimisation
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WP3: Manufacturing Process Development
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WP4: Technology Validation
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WP5: Dissemination & Exploitation
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WP6: Project Management
Project duration: 36 months
Target technology validation level: TRL4 (laboratory demonstrator)

Expected Impact
Scientific & Technological
TorPropel contributes to advancements in composite aerostructure modelling, automated composite manufacturing, and propulsion system acoustic optimisation.
Environmental
The project explores potential reductions in operational fuel consumption, aircraft noise emissions, and lifecycle material waste, supporting sustainability in the aerospace sector.
Societal
By integrating structural health monitoring and predictive maintenance capabilities, TorPropel aims to enhance aviation safety and operational reliability.