Posts tagged ‘center’

Warning Gauges are Usually Center Normal

By Chad Upton | Editor

Even if you don’t know anything about cars, this can help you spot a problem, even if you don’t know what it is.

Virtually every car has a speedometer and a fuel gauge and you can obviously read those gauges. Many cars also have a tachometer; it measures the engine speed in revolutions per minute (rpm). This can help you understand when to shift gears and when you’re burning the least/most fuel.

Some cars have other gauges too. Generally speaking, the needle on most of these other gauges should be near the middle of the gauge when the vehicle is operating normally. Depending on the gauge, it will usually have a red mark on one or both sides of the gauge, indicating trouble if the needle reaches that mark.

Some of these gauges take a few minutes to settle near the center, particularly the various temperature and pressure gauges that may appear in some vehicles.

These are called center normalized gauges and have been a popular gauge design standard for a long time. With so many in-car distractions, simplifying gauge design makes it easy to identify a problem.

In racing some drivers even tape over the sides of the gauges, leaving on the center visible — then they can only see the needle when it is in the center position, making it even easier to identify a problem.

One of the most popular additional gauges is the engine coolant temperature gauge. It is identified by a symbol that looks like a thermometer partially submerged in liquid. This gauge indicates when your engine is overheating.

The following gauges are not exactly warning gauges, so they’re exempt from the center normal rule: speedometer (mph or km/h), tachometer (rpm), fuel, and turbo (boost).

Of course, not all cars use center normal gauges, but you’ll be able to tell a few minutes after your car has been running normally.

Broken Secrets

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Sources: Answers.com, umich.edu

Photos: Photo courtesy of Aaron Gold at _cars.about.com_, rastrus (cc)

August 2, 2010 at 5:00 am 2 comments

Why Airplanes Don’t Always Fly in Straight Lines to Their Destination

If you’ve ever been on a flight equipped with a screen that shows the flight path, you might notice some zigs and zags that make your direct flight look like a scenic air tour. There are a number of reasons for this, but most of the time it comes down to Air Traffic Control (ATC).

Some people think that air traffic controllers are the guys that stand on the ground, waving lighted wands to guide the plane up to the gate. Those guys are actually part of the ground crew and they only have control over your flight for the last couple hundred feet before you reach the gate. The rest of the flight is controlled by someone else and it’s not the pilot.

The pilot flies the plane, but his course is being set by somebody on the ground. Those people are known as Air Traffic Controllers.

This system is a lot more complicated than it seems.

At the airport, the air traffic controllers sit up in the control tower. Those guys decide who gets to take off and land, which runways they use and when. They also direct planes that are moving around on the ground between gates and runways on the apron and taxiways. This aims to provide an organized flow of ground traffic and a safe flow of air traffic.

Once your plane has left the immediate area of the airport, the pilot must then communicate with a regional controller at an Area Control Center (ACC). If you’re on a long flight, you may get passed from one ACC to the next multiple times as you fly across the country.

Why? (more…)

February 17, 2010 at 2:39 am 13 comments


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