Jet air start system ventura
An air-start system is a power source used to provide the initial rotation to start large diesel and gas turbine engines.
Compared to a gasoline (petrol) engine, a Diesel engine has a very high compression ratio , an essential design feature, as it is the heat of compression that ignites the fuel. An electric starter with sufficient power to "crank" a large Diesel engine would itself be so large as to be impractical, thus the need for an alternative system.
When starting the engine, compressed air is admitted to whichever cylinder has a piston just over top dead center , forcing it downward.  As the engine starts to turn, the air-start valve on the next cylinder in line opens to continue the rotation. After several rotations, fuel is injected into the cylinders, the engine starts running and the air is cut off.
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Every two years at Woodcraft Magazine, we create a unique home workshop issue for readers wanting to start a shop or improve the one they already have. We first decide on a theme and then follow through by selecting a bare-bones space that serves as our blank slate. We then prep the walls, ceiling, and floor for shop duty and outfit the space with original shop projects and interesting products that match nicely with the theme, which, in this issue, is the “up-and-comer’s” home shop. As you can imagine, it’s an all-hands effort by our talented staff and woodworking contributors from across the country.
Homeowners have grown increasingly hands-on when it comes to improving their homes. To help do-it-yourselfers work safely and successfully, Woodcraft offers these tips.
A jet engine is a type of reaction engine discharging a fast-moving jet that generates thrust by jet propulsion . This broad definition includes airbreathing jet engines ( turbojets , turbofans , ramjets , and pulse jets ). In general, jet engines are combustion engines.
The thrust of a typical jetliner engine went from 5,000 lbf (22,000 N) ( de Havilland Ghost turbojet ) in the 1950s to 115,000 lbf (510,000 N) ( General Electric GE90 turbofan) in the 1990s, and their reliability went from 40 in-flight shutdowns per 100,000 engine flight hours to less than one in the late 1990s. This, combined with greatly decreased fuel consumption, permitted routine transatlantic flight by twin-engined airliners by the turn of the century, where before a similar journey would have required multiple fuel stops. 
Jet engines date back to the invention of the aeolipile before the first century AD. This device directed steam power through two nozzles to cause a sphere to spin rapidly on its axis. So far as is known, it did not supply mechanical power and the potential practical applications of this invention did not receive recognition. Instead, it was seen as a curiosity.
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