Glossary of Terms

Airlander 10   Airlander 50
HAV Terminology Description
Airlander Brand name for the leading type of Hybrid Aircraft.  Expected to become synonymous as the name for this new type of aircraft, rather like Hoover is to vacuum cleaners.  Airlanders are typically weighted to be slightly heavier-than-air and to therefore fly like an aeroplane whilst getting the benefits of the “free lift” from what is essentially a helium-filled wing.
Airship Worldwide term for a lighter than air vehicle. 
Air-Cushioned Landing System (ACLS) Airlander 50 will be fitted with an ACLS which in simplest terms comprises a pair of hovercraft installed to the underside of the hull, allowing the vehicle to operate on all surfaces as well as acting as landing gear.
Aerodynamic lift The lift provided by the shaping of the hull and the air passing over it, exactly like an aircraft’s wing.  This stems from Bernoulli’s Principle.
Aerostatic lift Buoyant lift provided by a ‘lighter-than-air’ gas such as helium.  This is Archimedes Principle in action.
Auxiliary Landing System (ALS) A pressurised air cushion fitted on either side of the Flight Deck which contacts the ground during a landing and allows for a safe landing at range of attitudes.
Ballonets These are air filled bags mounted within the hull that the hull pressure system uses to maintain a constant hull pressure.  On Airlander there are four of them, one in each corner of the hull.
Bow Thruster A front-mounted engine used for manoeuvring at low speeds and when taxying on the ground.  A system that will be used on some future Airlander variants. 
Blimp American term for a non-rigid airship.
Cabin The space where cargo, passengers or equipment is placed during flight. In defence and security roles this is often referred to as the Payload Module.
Cargo handling system The Airlander 50 is fitted with a number of internal winches and cranes to facilitate loading/unloading of freight at austere locations.
Envelope The fabric structure that contains the lift gas in a lighter-than-air aircraft.
Fins / Tailfins These are fitted to the rear of the hull and provide directional control exactly like those fitted to airplanes.
Flight Deck The correct terminology for what is often referred to as a Cockpit.  Where the pilot flies the aircraft from.
Flight Training Device Generally called a Flight Simulator, the sophisticated system that simulates flight conditions used for training pilots and engineers and simulating different scenarios for development purposes. 
Fuel Module The part of the hybrid air vehicle that stores the fuel for use during flight.
Heavier-than-air An aircraft that is heavier than the air it displaces that gains lift by aerodynamic means.
Hull The Envelope or ‘vessel’ that contains the helium lifting gas and provides the primary structure of the aircraft.
Hull Pressure System This system pumps air into or vents air from the ballonets, maintaining the air vehicle at a constant pressure and hence maintaining its shape.
Hull Strake An aerodynamic feature used to smooth airflow from the Forward Propulsors. In Layman’s terms a small side keel.
Hybrid Aircraft An aircraft that derives its ability to fly from a combination of buoyant lift, aerodynamic lift and thrust vectoring from its engines. In layman’s terms a combination of an aeroplane wing, and an airship, with some helicopter hovering ability thrown in.
Landing Gear Generic term for anything that helps an aircraft in take-off and/or landing.
Leading Edge Root Extension (LERX) Leading Edge Root Extension is a small extension to an aircraft wing surface, forward of the leading edge. The Airlander has LERX leading into the fins.
Lighter-than-air Description an airship or a balloon filled with a gas that is lighter than air to gain buoyancy.
LOw Carbon Aircraft Technology (LOCATE) This is a research and development programme for Airlander that was funded by Innovate UK.
Long Endurance Multi-Intelligence Vehicle (LEMV) The name given to our aircraft under the US Government contract before it was brought back to the UK and became the Airlander.
Mission Module A defence and security name for the complete structure hanging under the Hull – the Flight Deck, Payload Module and Fuel Module taken together. In civilian roles this is referred to generically as the Cabin.
Mylar A polyester film within the hull fabric that limits gas loss.
Towable Mooring Mast Often called the TMM, this is the towable trailer that has a telescopic mooring mast that secures the Airlander to the ground. Similar to a buoy for a boat.
Mobile Mooring Mast (MMM) This is the self-propelling vehicle that has a telescopic mooring mast that secures the Airlander to the ground.  Similar to a buoy for a boat. 
Mooring Mast Interface Often called the MMI, this is the housing for the Towable Mooring Mast that the Airlander “weather vanes” around when secured to the ground.
Parafil rope High tenacity polyester fibre ropes uses to brace the fins.
Pressure Stabilised Airshipor Non-rigid Airship An airship with a hull that only provides structure / shape when internally pressurised/inflated.
Propulsors The propulsors (one at each corner of the vehicle) house the aircraft’s main engines, propellers and vectoring vanes which provide the thrust required for the vehicle to take-off, manoeuvre and land. The correct terminology for what are often referred to as 'engines'.
Rigid Airship Comprises of rigid hoop frames and beams, and does not require internal pressure to fly. In some countries it is called a “Zeppelin”.
Semi-rigid Airship An airship which relies on both rigid structural elements and a pressurised hull for strength. (the Zeppelin NT – the current Goodyear blimp - is an example of this).
Simulator Another term for Flight Training Device.
Skids The two inflated tubes at the base of the Airlander 10 that act as landing gear to allow for landing and take-off from a multitude of surfaces.
Tedlar A polymer material that forms the outer layer of the bespoke hull fabric and provides significant protection from weather and UV light.
Vectoring Vanes These vanes, mounted to the rear of each propulsor allow the thrust to be turned in almost any direction allowing the hybrid air vehicle to be steered at low airspeeds or hovered over a point for freight delivery.
Vectran A manufactured fibre of carbon-fibre weave that forms the inner layer of the bespoke hull fabric, and provides considerably strength to the hull fabric.
Zeppelin Often thought to be interchangeable with airship but technically a manufacturer’s name (famous for ‘rigid’ and semi-rigid airships).
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