Second, our military missile program, going forward so successfully, does not suffer from our present lack of very large rocket engines, which are necessary in distant space exploration.

If, for some reason such as economy, we are not going to develop aircraft nuclear propulsion with a sense of national urgency, then we should turn our effort to developing jet engines with a thrust-to-weight ratio of 12 or 15 to one.

The reason that we are not going ahead full speed to develop high thrust-to-weight engines is that it would cost perhaps a billion dollars -- and you don't spend that sort of money if aircraft are obsolete.

Most modern AFVs are superficially similar in design to their World War II counterparts, with significantly better armour, weapons, engines and suspension-however with an increase in the capacity of transport aircraft allowing AFVs to be practically transported by air, many armies are replacing some or all of their traditional heavy vehicles with lighter airmobile versions, often with wheels instead of tracks.

* Motorboats, which are boats propelled by mechanical means, such as engines.

Diesel engines are run with an excess of oxygen to combust small particles that tend to form with only a stoichiometric amount of oxygen, necessarily producing nitrogen oxide emissions.

Combustion instabilities are a major concern in ground-based gas turbine engines because of NOx emissions.

) Such engines are possible in laboratory settings, but mass production is not feasible with current technology.

Other CPAN search engines that have been set up are:

This occurs because internal combustion engines are heat engines, and higher efficiency is created because higher compression ratios permit the same combustion temperature to be reached with less fuel, while giving a longer expansion cycle, creating more mechanical power output and lowering the exhaust temperature.

They are powered by nuclear engines that will fatally over-heat if they stop.

Large engines are usually multicylinder to reduce pulsations from individual firing strokes, with more than one piston attached to a complex crankshaft.

Many small engines, such as those found in mopeds or garden machinery, are single cylinder and use only a single piston, simplifying crankshaft design.

Most modern high speed production engines are classified as " over square " or short-stroke, wherein the stroke is less than the diameter of the cylinder bore.

Rotary engines such as the Wankel engine are referred to as pistonless rotary engines.

Monolithic crankshafts are most common, but some smaller and larger engines use assembled crankshafts.

Iron crankshafts are today mostly found in cheaper production engines ( such as those found in the Ford Focus diesel engines ) where the loads are lower.

* Database language engines ( or processors )-Most operations upon databases are performed through expression in Database languages ( see above ).

A simple example can be seen in the combustion of hydrogen and oxygen, which is a commonly used reaction in rocket engines:

Devices converting heat energy into motion are commonly referred to simply as engines.

The smaller engines were commonly air-cooled and located at the rear of the vehicle ; compression ratios were relatively low.

Internal combustion engines are most commonly used for mobile propulsion in vehicles and portable machinery.

When running at lower speeds, quenching is commonly observed in diesel ( compression ignition ) engines that run on natural gas.

Kerosene is widely used to power jet engines of aircraft ( jet fuel ) and some rocket engines, but is also commonly used as a cooking and lighting fuel and for fire toys such as poi.

Jet engines are generally used in cruise missiles, most commonly of the turbojet type, due to its relative simplicity and low frontal area.

The attribute was popularized by search engines such as Infoseek and AltaVista in 1995, and its popularity quickly grew until it became one of the most commonly used elements.

Turbos are commonly used on truck, car, train and construction equipment engines.

In aircraft engines, turbocharging is commonly used to maintain manifold pressure as altitude increases ( i. e. to compensate for lower-density air at higher altitudes ).

Modern V6 engines commonly range in displacement from, though larger and smaller examples have been produced.

The business produced light sports cars, originally in steel but subsequently with fiberglass bodies mainly powered by Panhard flat-twin engines, most commonly of 610, 744, or 851 cc.

A compact SUV is a class of smaller SUVs that are commonly built with less cargo and passenger space, and often with smaller engines resulting in better fuel economy.

Recently, ( December 2010 ) real-time strategy games have more commonly incorporated physics engines, such as Havok, in order to increase realism experienced in gameplay.

Two-stroke petrol ( gasoline ) engines continue to be commonly used in high-power, handheld applications such as string trimmers and chainsaws.

In place of the split big ends and two-piece big-end bearings commonly used in car engines, the 2CV engine used connecting rods with one-piece big-ends and bearings, which were fitted to the crankpins before the crank was assembled.

Internal combustion engines and compressed air are also commonly used.

Other vehicle models commonly used in the role of all-terrain fire engines include the Pinzgauer and Unimog.

The radial configuration was very commonly used in aircraft engines before turbine engines became predominant.

Until the development of the jet engine, large aircraft commonly used radial engines.

An ' Otto cycle ' is an idealized thermodynamic cycle which describes the functioning of a typical spark ignition reciprocating piston engine, the thermodynamic cycle most commonly found in automobile engines.

This is why the four-stroke principle today is commonly known as the Otto cycle and four-stroke engines using spark plugs often are called Otto engines.

This method of computing compression ratio cannot be used accurately for engines that have pistons with either domed or irregularly shaped heads.

A Group C Nimrod NRA / C2 which used Aston Martin's V8 engines in the 1980s.

The first buses powered by internal combustion engines were used in 1895 and this is still the most common power source.

Brabham used engines from Australian engineering firm Repco, which had never produced a Formula One engine before, based on aluminium V8 engine blocks from the defunct American Oldsmobile F85 road car project, and other off the shelf parts.

This is used in a form of machinery such as internal combustion engines and in thermobaric weapons.

Combustion resulting in a turbulent flame is the most used for industrial application ( e. g. gas turbines, gasoline engines, etc.

In liquid jet engines the droplet size and distribution can be used to attenuate the instabilities.

* Continuously regenerating particulate trap, a filter used to handle particulate emissions from diesel engines

The previous image shows the original piston-and-cylinder diagram used by Carnot in discussing his ideal engines.

Currently, even blades made of advanced metal alloys used in the engines ' hot section require cooling and careful limiting of operating temperatures.

* Air-independent propulsion aka Closed cycle diesel engines, propulsion used on diesel submarines

Higher compression ratios will however make gasoline engines subject to engine knocking if lower octane-rated fuel is used, also known as detonation.

Mazda is in 2012 releasing new petrol engines under the brand name SkyActiv with 14: 1 compression ratio, to be used in all Mazda vehicles by 2015.

Under ideal ( adiabatic ) conditions, the exponent would be 1. 4, but a lower value, generally between 1. 2 and 1. 3 is used, since the amount of heat lost will vary among engines based on design, size and materials used, but provides useful results for purposes of comparison.

Milestones among feedback, or " closed-loop " automatic control devices, include the temperature regulator of a furnace attributed to Drebbel, circa 1620, and the centrifugal flyball governor used for regulating the speed of steam engines by James Watt in 1788.

First used in China, cannon were among the earliest forms of gunpowder artillery, and over time replaced siege engines — among other forms of aging weaponry — on the battlefield.

A catapult is a device used to throw or hurl a projectile a great distance without the aid of explosive devices — particularly various types of ancient and medieval siege engines.

The steam clipper was developed around this time, and had auxiliary steam engines which could be used in the absence of wind.

Diesel engines ( heat engines using the Diesel cycle ) are used in automobiles, power generation, Diesel-electric locomotives, and submarines.

In North America, Diesel engines are primarily used in large trucks, where the low-stress, high-efficiency cycle leads to much longer engine life and lower operational costs.

Some 19th-century or earlier experimental engines used external flames, exposed by valves, for ignition, but this becomes less attractive with increasing compression.

Low-speed diesel engines ( as used in ships and other applications where overall engine weight is relatively unimportant ) can have a thermal efficiency that exceeds 50 percent.