Take a 20 kilometers-per-liter hybrid, which is a small car with two engines--one gasoline, one electric--that work in collaboration.
The trend toward smaller jets is quietly occurring over the Atlantic, too, as new advances now allow airlines to fly over the ocean with two engines instead of three or four, which makes flying smaller aircraft on the routes more feasible.
It was overhauled last summer, when its original, water-jet propulsion engines were replaced with two inboard propeller engines.
The Airbus A320 NEO will be a premium version offered with a choice of two engines boasting new technology.
The following year, Ryan qualified fifth fastest and was next to Steve Plater on the grid, posting a lap at over 121mph, but the bike was plagued with electrical problems and two blown engines on raceday made it a miserable weekend.
Also on Friday, Red Bull announced they would continue with Renault engines for the next two years.
To do that would require a Delta IV Heavy launch vehicle with a stack of two Star 48A engines.
But he does not think it is worthwhile to re-engine the aircraft because the savings would be tiny compared with the extra costs of having two different engines on a fleet of aircraft.
Researchers at MIT, led by Dr Mark Drela and tasked by NASA, have come up with a double-wide design: instead of the traditional single cylindrical body, two partial cylinders are joined together with three engines at the back of the plane between the double tail.
The latest controversy surrounding Germany's charismatic defence minister emerged when a Bremen University law professor began writing a review of the dissertation which was published two years ago, with the aid of internet search engines.
The plane is one of only two models still capable of turning its engines, with neither able to fly, organisers of the appeal said.
Hybrids need to be equipped with larger battery packs, smaller and more fuel-efficient engines and a "two-mode system" that uses a pair of electric motors that propel the car at lower speeds.
As with the Optima, the Regal offers a choice of two direct fuel-injected four-cylinder engines.
With regard to minimizing the impact of groundings caused by engine problems, the existence of two competing engines could help in some situations and hurt in others.
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While the two models share engines, transmissions and most other components, the A7 distinguishes itself with racier exterior styling, a four-passenger interior and a large hatchback instead of a trunk.
Mosley said that the TWG's idea - combined with his plans to drastically reduce the number of tyres allowed per weekend and make engines last for two races - would probably be enough to bring about the reduction in speeds he desired.
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New mopeds with engines below 50cc would then qualify for a state handout of 300, 000 lire and larger two-wheelers for 500, 000 lire.
One well-known study in 1979 found that when a plane sat three hours with its engines off and no air circulating, 72% of the 54 people on board got sick within two days.
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