A flexible multi-domain sizing tool for novel electrical machine types and topologies able to output a range of solutions reflecting the trade-offs between weight, volume, efficiency, safety and reliability will be utilized to easily interface with the overall system models and ensure results are optimised at system level.

A multi-disciplinary approach for the design of the novel GT engine concepts will be also provided.

All-solid-state batteries have shown a great innovation potential. Similar concepts will be assessed as there is a significant need to achieve maximum cell specific energy on the order of 500Wh/kg (the needs of a 19-pax aircraft would be at around 300Wh/kg) and is inherently safe for smaller applications as the general aviation can offer.

- High performance magnetic materials: high electric frequencies to grant a high torque density;

- High performance cooling: increase motor efficiency reducing losses due to high temperatures in copper wires, using optimal coolers at high coolant temperature (90-100 °C);

- Optimization of motor design rotational speed: aircraft application benefits from direct motor-propeller connection, avoiding a gearbox.

HECARRUS project will investigate novel architectures which have been found to be suitable for the case of short-haul aircrafts. An example of such architectures that will thoroughly explained and developed throughout the project’s progress is the omission of the booster, as it is described in the ‘Overal concept of the project’ chapter. Sensitivity studies of the key design parameters and technology target parameters of each subsystem will be performed, aiming to establish deep understanding of the hybrid derivatives.