propfan

 A propfan, also called an open rotor engine, or unducted fan (as opposed to a ducted fan), is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both.

 

outrigger

 An outrigger is a projecting structure on a boat, with specific meaning depending on types of vessel. Outriggers may also refer to legs on a wheeled vehicle that are folded out when it needs stabilization, for example on a crane that lifts heavy loads. 

 

pesero

 A pesero, combi, micro or microbús is a form of public transport, most commonly seen in Mexico City. Its name derives from the fact that in the beginning of this form of transport a flat fee of one peso was charged per ride (hence the name "pesero" which could be interpreted as "peso collector"). 

 

 

Trip Chaining

Trip chaining involves grouping errands or other activities into one trip instead of returning home in between each one. The more errands you group together, the more vehicle trips you save.

Wing fence

 Wing fences, also known as boundary layer fences and potential fences are fixed aerodynamic devices attached to aircraft wings. Often seen on swept-wing aircraft, wing fences are flat plates fixed to the upper surfaces parallel to the wing chord and in line with the free stream airflow, typically wrapping around the leading edge. By obstructing span-wise airflow along the wing, they prevent the entire wing from stalling at once, as opposed to wingtip devices, which increase aerodynamic efficiency by seeking to recover wing vortex energy. 

 

synchropter

 

Intermeshing rotors on a helicopter are a set of two rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. The arrangement allows the helicopter to function without a tail rotor, which saves power. However, neither rotor lifts directly vertically, which reduces efficiency per each rotor.

This configuration is sometimes referred to as a synchropter. 

 

 omnibology

the study of buses and / or public transport

ferroequinology

 

ferroequinology (uncountable)

(humorous, nonstandard) The study of railways in general, but especially locomotives. The study of iron horses.

boxcar

 

boxcar

Noun

• a freight car with roof and sliding doors in the sides

stormbound

stormbound (not comparable)

1. (of a ship) Caught in a storm, so that proper navigation is impossible.

canard

In aeronautics, a canard (French for "duck") is a fixed-wing aircraft configuration in which a small horizontal surface, also named the canard or foreplane, is positioned forward of the main wing in contrast to the conventional position at the tail. Because of this it is sometimes described as "tail-first".
The term "canard" arose in France. The appearance of the Santos-Dumont 14-bis of 1906 reminded the French public of a flying duck (Fr. canard)., and later the Fabre Hydravion of 1910 was named "Le Canard". Thereafter all aeroplanes with a foreplane were known as canards

Airspeed

Airspeed is the speed of an aircraft relative to the air. Among the common conventions for qualifying airspeed are: indicated airspeed ("IAS"), calibrated airspeed ("CAS"), true airspeed ("TAS"), equivalent airspeed ("EAS") and density airspeed.

The measurement and indication of airspeed is ordinarily accomplished on board an aircraft by an airspeed indicator ("ASI") connected to a pitot-static system. The pitot-static system comprises one or more pitot probes (or tubes) facing the on-coming air flow to measure pitot pressure (also called stagnation, total or ram pressure) and one or more static ports to measure the static pressure in the air flow. These two pressures are compared by the ASI to give an IAS reading.

Scuttling

Scuttling is the act of deliberately sinking a ship by allowing water to flow into the hull.

Monument to the Scuttled Ships by Amandus Adamson, just off the promenade at Sevastopol.

 

This can be achieved in several ways—valves or hatches can be opened to the sea, or holes may be ripped into the hull with brute force or with explosives. Scuttling may be performed to dispose of an abandoned, old, or captured vessel; to prevent the vessel from becoming a navigation hazard; as an act of self-destruction to prevent the ship from being captured by an enemy force; as a blockship to restrict navigation through a channel or within a harbor; or to provide an artificial reef for divers and marine life.

hypergolic

A rocket propellant combination used in a rocket engine is called hypergolic when the propellants spontaneously ignite when they come into contact with each other. The two propellant components usually consist of a fuel and an oxidizer. Although hypergolic propellants tend to be difficult to handle because of their extreme toxicity and/or corrosiveness, they can typically be stored as liquids at room temperature and hypergolic engines are easy to ignite reliably and repeatedly.
In contemporary usage, the terms "hypergol" or "hypergolic propellant" usually mean the most common such propellant combination, dinitrogen tetroxide plus hydrazine and/or its relatives monomethyl hydrazine and unsymmetrical dimethylhydrazine.

Dhow

Dhow (Arabic داو dāw) is the generic name of a number of traditional sailing vessels with one or more masts with lateen sails used in the Red Sea and Indian Ocean region. Historians are divided as to whether the dhow was invented by Arabs. Typically sporting long thin hulls, dhows are trading vessels primarily used to carry heavy items, like fruit, fresh water or merchandise, along the coasts of the Arabian Peninsula, Pakistan, India, Bangladesh and East Africa. Larger dhows have crews of approximately thirty, smaller ones typically around twelve.

pannier

pannier (plural panniers)

1. A large basket or bag fastened, usually in pairs, to the back of a bicycle or pack animal, or carried in pairs over the shoulders.
2. A decorative basket for the display of flowers or fruits.

From French panier, from Latin pānārium (“a bread basket”), from pānis (“bread”).

Autorotation

Autorotation is the state of flight where the main rotor system of a helicopter is being turned by the action of air moving up through the rotor rather than engine power driving the rotor, as with an autogyro. The term autorotation can be traced back to a period of early development in helicopters between 1915 and 1920 and refers to the rotors turning without the engine.

In normal, powered flight, air is drawn into the main rotor system from above and exhausted downward, but during autorotation, air moves up into the rotor system from below as the helicopter descends. Autorotation is permitted mechanically because of both a freewheeling unit, which allows the main rotor to continue turning even if the engine is not running, as well as curved main rotor blades such that when the collective pitch is fully down the inner part of the blade has negative pitch relative to the horizontal plane and can be spun up by the relative wind. It is the means by which a helicopter can be landed safely in the event of complete engine failure. Consequently all single-engine helicopters must demonstrate this capability in order to obtain a type certificate.

transaxle

In the automotive field, a transaxle is a major mechanical component that combines the functionality of the transmission, the differential, and associated components of the driven axle into one integrated assembly.

Transaxles are near universal in all automobile configurations that have the engine placed at the same end of the car as the driven wheels: the front-engine, front-wheel drive layout, rear-engine, rear-wheel drive layout and rear mid-engine, rear-wheel drive layout arrangements.

hydrofoil

A hydrofoil is a foil which operates in water. They are similar in appearance and purpose to airfoils.

Hydrofoils can be artificial, such as the rudder or keel on a boat, the diving planes on a submarine, a surfboard fin, or occur naturally, as with fish fins, the flippers of aquatic mammals, the wings of swimming seabirds, or other creatures like the sand dollar.

The term "hydrofoil" is commonly used for the wing-like structure mounted on struts below the hull of a variety of boats (see illustration), which lifts the boat out of the water during forward motion, in order to reduce hull drag. As a synecdoche, the term "hydrofoil" is often used to refer to boats using hydrofoil technology. Most of this article is about this type of hydrofoil.

trireme

A trireme (derived from Latin: "tres remi:" "three-oar;" Greek Τριήρης, literally "three-oarer") was an ancient vessel and a type of galley, a Hellenistic-era warship that was used by the ancient maritime civilizations of the Mediterranean, especially the Phoenicians, ancient Greeks and Romans.

The trireme derives its name from its three rows of oars on each side, manned with one man per oar. The early trireme was a development of the penteconter, an ancient warship with a single row of 25 oars on each side, and of the bireme (Greek: διήρης), a warship with two banks of oars, probably of Phoenician origin. As a ship it was fast and agile, and became the dominant warship in the Mediterranean from the 7th to the 4th centuries BC, when they were largely superseded by the larger quadriremes and quinqueremes. Triremes played a vital role in the Persian Wars, the creation of the Athenian maritime empire, and its downfall in the Peloponnesian War.

In English, no differentiation is made between the Greek triērēs and the Latin triremis. This is sometimes a source of confusion, as in other languages these terms refer to different styles of ships. Though the term today is used almost exclusively for ancient warships, modern historians also refer to medieval and early modern galleys with three banks of oars per side as triremes. The rowing arrangement of these differed considerably, though, since knowledge of the multi-level structure of the original triremes was lost some time during Late Antiquity.