aviation

WTF Fun Fact 13358 – The Black Box Is Not Black

You might have heard the term “the black box” in the context of airplane accidents. It’s what they look for after a crash because it holds information about the plane and its communications.

But did you know the so-called black box is actually bright orange? The reason is obvious, of course. The color makes it easier to locate.

The history of the black box

In the early days of aviation, there was little information available to investigators after airplane accidents. And this lack of data hindered the development of safety measures. So the industry found a way to collect the flight data they needed – even after a catastrophic accident.

In 1953, an Australian scientist named Dr. David Warren invented a device capable of recording flight data and cockpit conversations. He named his invention the “Flight Memory Unit.” This would eventually be known as “the black box.”

The box is formally referred to as the Flight Data Recorder (FDR) and the Cockpit Voice Recorder (CVR). The FDR logs essential flight parameters, like altitude, airspeed, and vertical acceleration. Meanwhile, the CVR captures audio from the cockpit, including conversations between pilots and air traffic control. Together, these devices provide a comprehensive account of a flight’s final moments. This allows investigators to piece together the causes of an accident.

Why is the box actually orange?

The device is not black, but orange, making it easier to spot amongst the wreckage. It’s also equipped with an Underwater Locator Beacon (ULB), which emits a signal for up to 30 days.

The box is very durable. It’s engineered to withstand extreme conditions, starting with the impact of a crash. It also goes through drop tests, crush tests, and fire tests.

So, the real question is actually “How did an orange box become known as a black box?”

The term “black box” is believed to have originated from journalists and the media, rather than from aviation experts or engineers. The origin of the term remains unclear. But in the early days of the black box, its inner workings and the data it recorded were not understood by the public. As a result, the media coined the term as a way to describe something mysterious.

— WTF fun facts

Source: “Orange is the new black: the history of the ‘black box’” — Aviation24.be

WTF Fun Fact 12713 – da Vinci’s “Helicopter”

It’s hard to put into words the genius of Leonardo da Vinci. You have to look beyond his paintings and into his notebooks to see just how masterfully his brain worked. It’s like he understood the secrets of nature in a way no one else could (either then or now).

For example, in the 1480s, he was already imagining ways to create flying machines. And some might call his “aerial screw” the forerunner of the helicopter. That’s an innovation that it took us 400 more years to actually create!

(It’s only fair to mention that de Vinci’s drawing is not the first-ever of a helicopter-type vehicle. In 400 BCE, Chinese Taoist scholar Ge Hong described a “vertical flying machine” made of bamboo in the Baopuzi, though he was referring to a spinning toy. And since Chinese manuscripts made their way to Europe during the Renaissance, da Vinci was possibly influenced by this. It certainly influenced future helicopter inventors.)

Today, we even call the Renaissance artist’s invention “da Vinci’s helicopter” these days, and he wrote an entire treatise on flight. Just look at a page to see what he was capable of:

From: https://airandspace.si.edu/exhibitions/codex/codex.cfm#page-20-21

In the modern world, companies still bicker over who invented the first real helicopter, so it’s just more fun to give credit to da Vinci.

Of course, the aerial screw isn’t the same helicopter we have today. It’s not like he built a gas engine or anything, but he did conceive of a blade that would lift a vehicle vertically off the ground. His blades were not flat but shaped like a screw or helix.

As physicist Tom Hartsfield described in Big Think:

“What da Vinci lacked was the modern materials necessary to construct a lightweight and durable blade. He described the helical screw as being made of linen, with the pores stopped up by starch.

He also lacked the continuous motive power for such a machine. Men turning cranks could never dream of flying: they are far too heavy and too weak to produce enough power to lift themselves…Cognizant of this limitation, da Vinci envisioned a spring, wound by the crank turners, building up and storing energy. That built-up energy could be released in a quick unwinding burst, spinning the screw rotor. But as far as we know, such a device was never built.”  — WTF fun facts

Source: “15th-century futurism: Leonardo da Vinci’s famous helicopter design finally takes flight” — Big Think