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An air data system including a housing, a bore, a dynamic port, a static port, a gas permeable membrane, and a device configured to determine a pressure differential. The bore may be located within the housing and may extend from an inlet for receiving air flow to an outlet. The dynamic port may be

An air data system including a housing, a bore, a dynamic port, a static port, a gas permeable membrane, and a device configured to determine a pressure differential. The bore may be located within the housing and may extend from an inlet for receiving air flow to an outlet. The dynamic port may be located in the bore and be configured and positioned to receive air passing through the bore. The static port may be configured and positioned to receive unmoving or ambient air. The device may determine the pressure differential between dynamic air received at the dynamic port and static air received at the static port. And the membrane may span the dynamic port, the static port, or both and is configured to direct moisture away from the port which it spans.

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1. An air data system, comprising: a housing;a bore located within the housing and extending from an inlet for receiving air flow to an outlet;a dynamic port located in the bore and configured and positioned to receive air passing through the bore;a static port configured and positioned to receive s

1. An air data system, comprising: a housing;a bore located within the housing and extending from an inlet for receiving air flow to an outlet;a dynamic port located in the bore and configured and positioned to receive air passing through the bore;a static port configured and positioned to receive static air;a device configured to determine a pressure differential between dynamic air received at the dynamic port and static air received at the static port; anda gas permeable membrane spanning at least one of the dynamic port or the static port and configured to direct moisture away from the at least one port it spans. 2. The air data system of claim 1 in which the gas permeable membrane is a polytetrafluoroethylene material. 3. The air data system of claim 1 further comprising a throat region in the bore between the inlet and the outlet, the dynamic port being located in the throat region. 4. The air data system of claim 3 in which the throat region has a hydrophobic surface. 5. The air data system of claim 1 in which the bore further comprises an upstream region between the inlet and the throat region and a downstream region between the throat region and the outlet, in which at least one of the regions has a hydrophilic surface. 6. The air data system of claim 1 in which the static port is located at an exterior surface of the housing. 7. The air data system of claim 1 in which the device further comprises a device chamber sealably divided by a diaphragm into a first cavity and a second cavity, the first cavity in fluid communication with the dynamic port and second cavity in fluid communication with the static port. 8. The air data system of claim 1 further comprising a processor configured to execute instructions to determine a pressure differential based on an electronic input received from the device. 9. The air data system of claim 1 further comprising a plurality of dynamic ports located in the bore. 10. The air data system of claim 9 further comprising a plurality of static ports. 11. The air data system of claim 10 in which the device is configured to determine a pressure differential between air pressure received by at least one port of the plurality of dynamic ports and at least one port of the plurality of static ports. 12. The air data system of claim 11 in which, in its determination, the device is configured to ignore the received air pressure of at least one of the ports when the air pressure of the at least one port is anomalous. 13. An unmanned aerial vehicle (UAV), comprising a fuselage and a wing adapted for flight, in which the wing carries the air data system defined in claim 1. 14. A method of determining a pressure differential, comprising the steps of: (a) receiving air at a dynamic port located in an interior surface of a bore, and in which at least part of the interior surface is a hydrophobic or hydrophilic surface, the dynamic port having a first pressure;(b) receiving air at a static port having a second pressure;(c) diverting moisture from at least the dynamic port or the static port; and(d) determining a pressure differential associated with the air received at the dynamic port and the static port. 15. The method of claim 14 in which step (c) includes providing a gas permeable membrane in a position spanning at least one of the dynamic port or the static port. 16. The method of claim 14 in which step (a) includes receiving air at a dynamic port disposed in a throat region of the interior surface between an upstream region and a downstream region, the upstream and downstream regions having hydrophobic surfaces and the throat region having a hydrophilic surface. 17. The method of claim 14 in which step (a) includes receiving air at a plurality of dynamic ports and step (b) includes receiving air at a plurality of static ports, and the determination of step (d) is based on the air received by at least one of the dynamic ports and at least one of the static ports.