A flying device includes a main body, to which a combustion engine, an electric motor, an electricity generator and an electrical energy transfer circuit are attached. The combustion engine and electric motor are arranged to create thrust vectors and are placed on either side of the main body in order to create thrust vectors on each side of a plane of separation of said body. The electricity generator is mechanically coupled to the combustion engine in order to be driven thereby. The electrical energy transfer circuit is connected between the electricity generator and the electric motor, the energy transfer circuit being configured to create mechanical resistance that slows the combustion engine and to produce electrical energy in order to power the electric motor.

A flying device includes a main body, to which a combustion engine, an electric motor, an electricity generator and an electrical energy transfer circuit are attached. The combustion engine and electric motor are arranged to create thrust vectors and are placed on either side of the main body in order to create thrust vectors on each side of a plane of separation of said body. The electricity generator is mechanically coupled to the combustion engine in order to be driven thereby. The electrical energy transfer circuit is connected between the electricity generator and the electric motor, the energy transfer circuit being configured to create mechanical resistance that slows the combustion engine and to produce electrical energy in order to power the electric motor.

Methods of controlling an in-line heater for an energy storage device are provided. A determination is made that a pump is running. When running, the pump circulates a thermal management fluid through a thermal management conditioning loop, which includes the in-line heater and a heat transfer hardware configured to transfer heat between the thermal management fluid and the energy storage device, wherein the in-line heater is in thermal communication with the thermal management fluid. The in-line heater is turned on in response to the determination that the pump is running and a temperature of the thermal management fluid is below a lower control limit.

Methods of controlling an in-line heater for an energy storage device are provided. A determination is made that a pump is running. When running, the pump circulates a thermal management fluid through a thermal management conditioning loop, which includes the in-line heater and a heat transfer hardware configured to transfer heat between the thermal management fluid and the energy storage device, wherein the in-line heater is in thermal communication with the thermal management fluid. The in-line heater is turned on in response to the determination that the pump is running and a temperature of the thermal management fluid is below a lower control limit.

An aircraft having unobstructed cabin door access includes a hybrid power drive with a combustion engine connected to an electricity generating machine. Components of the hybrid power drive are positioned throughout the aircraft to provide a weight distribution having an aft bias. The aircraft further includes a forward swept wing and a cabin door positioned forward of the forward swept wing, such that access into a fuselage of the aircraft via the cabin door is unobstructed by the forward swept wing.

A battery pack assembly, comprising: a battery pack, the battery pack comprising: a battery pack enclosure, and one or more battery cells within the battery pack enclosure, and a junction box, the junction box comprising: a junction box enclosure including one base wall, four side walls connected to the base wall, and one open end, and a battery management unit, at least one fuse, and at least one switch, each located within the junction box enclosure and mounted to the base wall. The four side walls of the junction box enclosure are removably secured to the battery pack enclosure at the open end.

A battery pack assembly, comprising: a battery pack, the battery pack comprising: a battery pack enclosure, and one or more battery cells within the battery pack enclosure, and a junction box, the junction box comprising: a junction box enclosure including one base wall, four side walls connected to the base wall, and one open end, and a battery management unit, at least one fuse, and at least one switch, each located within the junction box enclosure and mounted to the base wall. The four side walls of the junction box enclosure are removably secured to the battery pack enclosure at the open end.

A thermal management system for an energy storage system, the energy storage system comprising an energy storage device, an energy storage monitoring system including circuitry dedicated and configured to monitor a temperature of the energy storage device. The thermal management system comprises: a thermal management conditioning loop, a pump configured to circulate a thermal management fluid through the thermal management conditioning loop, a heat source, and a heat transfer hardware in thermal communication with the energy storage device. An energy storage controller of the energy storage monitoring system is configured to confirm that a temperature of the thermal management fluid and/or a temperature of the energy storage device is below an upper safety limit, between a lower control limit and an upper control limit, or both, and in response, to send an enable heater request indicating the heat source is to turn on.

A thermal management system for an energy storage system, the energy storage system comprising an energy storage device, an energy storage monitoring system including circuitry dedicated and configured to monitor a temperature of the energy storage device. The thermal management system comprises: a thermal management conditioning loop, a pump configured to circulate a thermal management fluid through the thermal management conditioning loop, a heat source, and a heat transfer hardware in thermal communication with the energy storage device. An energy storage controller of the energy storage monitoring system is configured to confirm that a temperature of the thermal management fluid and/or a temperature of the energy storage device is below an upper safety limit, between a lower control limit and an upper control limit, or both, and in response, to send an enable heater request indicating the heat source is to turn on.

A system is provided for an aircraft. This aircraft system includes an aircraft structure, an electrical power storage and an air system. The aircraft structure includes an internal compartment. The electrical power storage is housed within the internal compartment. The air system is configured to direct pressurized air into the internal compartment. The air system includes a plurality of air sources and a flow regulator. The flow regulator is configured to fluidly couple each of the air sources to the internal compartment.