A single-unit nose cone for a ram air including: a dome portion located at a forward end of the single unit nose cone; a dome stand portion adjacent to the dome portion; a seat portion adjacent to the dome stand portion; and a stem portion adjacent to the seat portion and located at an aft end of the single-unit nose cone, wherein the dome portion, the dome stand portion, the seat portion, and the stem portion are composed from a single piece of material having a density of about 0.286 pound/cubic inch (7916 kilogram/cubic meter).

A method for generating electrical power comprising operating variable frequency generators using a common prime mover and controlling the variable frequency generators using a mechanical phase difference as follows: $MPD=\frac{360}{Gp}$
wherein MPD is the mechanical phase difference in degrees between rotors between a pair of variable frequency generators, G is a number of variable frequency generators, is a number of electrical phases in a variable frequency generator in the variable frequency generators, and p is a number of pole pairs in the variable frequency generator in the variable frequency generators, wherein the variable frequency generators are controlled such that each variable frequency generator in the variable frequency generators has a selected mechanical phase difference from another variable frequency generator in the variable frequency generators that is an integer multiple of the mechanical phase difference that is less than 360 degrees.

The present disclosure is directed to an aircraft with an accessory system configured to be powered independent of the primary propulsion system by a ram air turbine power system. The ram air turbine power system illustratively includes an accessory generator integrated with a turbine rotor as well as other components so as to manage space claim and offer unique functionality.

An apparatus for unlocking an actuator comprises a first member mounted in a housing for longitudinal movement along an axis. A recess is formed in a surface of the first member. The apparatus further comprises a second member for operative connection to a lock release element of an actuator for movement in a direction generally transverse to the axis of movement of the first member. The second member has a follower element resiliently biased into contact with the surface of the first member. The apparatus further comprises an unlocking actuator for moving the first member along the axis between a first, locking position in which the follower element engages the surface and a second, unlocking position in which the follower element is at least partially received within the recess.

A heat exchanger includes a plate with an external surface, a channel, and a nozzle. The external surface bounds an interior of the plate. The channel is disposed in the heat exchanger and passes through a portion of the interior. The nozzle is integrally disposed in the heat exchanger, extends through a portion of the external surface, and is fluidly connected to the channel. The nozzle is configured to transport a liquid from the channel, through the external surface, and to distribute the liquid onto a portion of the heat exchanger.

A method for operating an electric fan of an aircraft propulsion system includes driving a plurality of fan blades of the electric fan with an electric machine to generate thrust for the aircraft; and driving the electric machine with the plurality of fan blades of the electric fan to generate electrical power subsequent to driving the plurality of fan blades of the electric fan with the electric machine to generate thrust for the aircraft.

A supply system for providing at least oxygen depleted air and water in a vehicle includes at least one hydrogen supply means, an air channel having an inlet and an outlet, an air cooled fuel cell unit couplable with the hydrogen supply means and arranged inside the air channel and at least one catalytic converter couplable with the hydrogen supply means and arranged between the fuel cell unit and the outlet of the air channel inside the air channel. The air cooled fuel cell unit is adapted for conducting a fuel cell process under consumption of air flowing from the inlet of the air channel through the air cooled fuel cell unit and hydrogen from the hydrogen supply means. At least one catalytic converter is adapted for producing water and oxygen depleted air under consumption of hydrogen from the at least one hydrogen supply means and air.

A method of producing an aircraft battery system, the method comprising: identifying a volume of free space on an aircraft (100); arranging a plurality of electrical power cells (112, 114) such that the plurality of cells (112, 114) are capable of fitting into the identified volume, wherein the arrangement of cells (112, 114) has a non-cuboid shape; fixing the plurality of cells (112, 114) together such that the relative positions of the electrical power cells (112, 114) are maintained; electrically connecting the plurality of cells (112, 114) together, thereby to provide a battery (102, 104); and electrically connecting a DC-to-DC converter (106, 108) to the battery (102, 104), the DC-to-DC converter (106, 108) being configured to control a voltage of the battery (102, 104) to be equal to a specified voltage or within a specified voltage range.

A ram air fan and fan bypass shutoff check valve assembly includes a ram air fan configured to draw an airflow through a fan inlet, and a ram fan bypass duct positioned downstream of the ram air fan. The ram fan bypass duct includes a valve assembly configured to selectably direct the airflow through the ram air fan when the valve assembly is in an open position, and direct the airflow through a bypass duct thereby bypassing the ram air fan when the valve assembly is in a closed position.

Apparatus and methods to deploy a fluid flow channel are disclosed herein. An example apparatus includes a first loop coupled to an outside surface of a vehicle via a first fastener, a second loop coupled to the vehicle and disposed a distance from the first loop, and a flexible material having a first end coupled to the first loop and a second end coupled to the second loop, where the flexible material is to form a fluid flow channel between the first loop and the second loop.