Abstract: A drive unit for a rotary-wing aircraft has a first and second propeller, which rotates in the opposite direction to, and are axially spaced apart from, the first propeller. A first and second drive shaft are arranged coaxially with the first drive shaft, for the propellers, wherein the propellers are each rigid and mounted to be tiltable relative to the axis of rotation of their drive shafts. The tilt axis of each propeller extends in a plane perpendicular to the axis of rotation of the drive shafts and is oriented at an angle different from 90° relative to the longitudinal axis of the propeller. An electric drive module has at least two rotors which are coupled to one of the drive shafts, wherein the ratio of the diameter of the propellers to the axial distance between the propellers is between 4:1 and 12:1.

Abstract: A method for determining a filling mass in a thermally insulated container for a cryogenically stored gas includes determining the filling mass using a known container volume and a calculated density of the gas content of the container. A temperature sensor is used for measuring a mixing temperature of liquid and gaseous phases, where the liquid phase is extracted via a first extraction supply line at the geodetically lowest point, and the gaseous phase is extracted via a second extraction supply line at the geodetically highest point. Downstream of the extraction points, after a convergence of the first and the second extraction supply line, the temperature sensor is placed where a complete and thorough mixing of the liquid and the gaseous phase of the gas from the first and second extraction supply line has already taken place.

Abstract: In the case of a storage vessel of cryogenic gas or cryogenic compressed gas, particularly a cryo-pressure tank for a motor vehicle, having a storage volume for accommodating the stored gas, a mixing device is provided in the storage volume for mixing the gas stored in the storage volume.

Abstract: A storage container for a motor vehicle for storing cryogenic compressed gas, potentially in an over-critical state, having an inlet for introducing the gas to be stored into a storage volume. The inlet has a plurality of inlet openings that are arranged spaced apart from one another and extend into the storage volume. The arrangement serves for localized cooling of the gas and prevents strong thermoelectric voltages on the wall of the storage container.

Abstract: A method for determining a filling mass in a thermally insulated container for a cryogenically stored gas is disclosed. The filling mass is determined by way of a known container volume and a calculated density of the gas content of the container. A temperature sensor is used for measuring a mixing temperature of a liquid and a gaseous phase of the gas. The liquid phase is extracted by way of a first extraction supply line at the geodetically lowest point, and the gaseous phase is extracted by way of a second extraction supply line at the geodetically highest point of the container cavity. Downstream of the extraction points, after a convergence of the first and the second extraction supply line to a single extraction supply line leading out of the container, the temperature sensor is placed where a complete and thorough mixing of the liquid and the gaseous phase of the gas from the first and second extraction supply line has already taken place.

Abstract: In the case of a storage vessel of cryogenic gas or cryogenic compressed gas, particularly a cryo-pressure tank for a motor vehicle, having a storage volume for accommodating the stored gas, a mixing device is provided in the storage volume for mixing the gas stored in the storage volume.

Abstract: A storage container for a motor vehicle for storing cryogenic compressed gas, potentially in an over-critical state, having an inlet for introducing the gas to be stored into a storage volume. The inlet has a plurality of inlet openings that are arranged spaced apart from one another and extend into the storage volume. The arrangement serves for localized cooling of the gas and prevents strong thermoelectric voltages on the wall of the storage container.