Abstract: An example method carried out by an uncrewed vehicle (UV) is disclosed. The method may involve establishing a wireless cellular connection with a wireless cellular network via a wireless cellular communications interface of the UV. The wireless cellular network may be communicatively connected with one or more data servers via a data backhaul network. The example method may further involve exchanging operational data between the one or more data servers and a data storage device of the UV via the wireless cellular connection with the wireless cellular network, establishing a wireless local area network (WLAN) network connection with one or more uncrewed aerial vehicles (UAVs) via a WLAN communications interface of the UV, and exchanging the operational data between the data storage device and at least one of the one or more UAVs over the WLAN network connection.

Abstract: Acoustic noise from relatively high pressure gas flows as a result of opening for example a bypass valve in a gas turbine engine can cause problems. By provision of an acoustic apparatus incorporating an inner chamber where there is a pressure reduction and then a chamber divider surface incorporating small apertures with a wide spacing distribution an upward shift in acoustic frequency of the gas flow is achieved beyond normal human comprehension. An outer chamber is provided to receive the fine gas flow jets from the apertures in the chamber divider surface for further pressure reduction and low pressure release through wider apertures in an exit surface.

Abstract: A sealed assembly comprising two bodies and an elastomeric seal therebetween wherein the seal comprises an internal web that is aligned in the general direction of a shear force between the two bodies.

Abstract: Acoustic noise from relatively high pressure gas flows as a result of opening for example a bypass valve in a gas turbine engine can cause problems. By provision of an acoustic apparatus incorporating an inner chamber where there is a pressure reduction and then a chamber divider surface incorporating small apertures with a wide spacing distribution an upward shift in acoustic frequency of the gas flow is achieved beyond normal human comprehension. An outer chamber is provided to receive the fine gas flow jets from the apertures in the chamber divider surface for further pressure reduction and low pressure release through wider apertures in an exit surface.