Win a Trip to Any National Park By Instagramming Your Travels

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If you're planning out your summer vacation, make sure to add a few national parks to your itinerary. Every time you share your travels on Instagram, you can increase your chances of winning a VIP trip for two to the national park of your choice.

The National Park Foundation is hosting its "Pic Your Park" sweepstakes now through September 28. To participate, post your selfies from visits to National Park System (NPS) properties on Instagram using the hashtag #PicYourParkContest and a geotag of the location. Making the trek to multiple parks increases your points, with less-visited parks in the system having the highest value. During certain months, the point values of some sites are doubled. You can find a list of participating properties and a schedule of boost periods here.

Following the contest run, the National Park Foundation will decide a winner based on most points earned. The grand prize is a three-day, two-night trip for the winner and a guest to any NPS property within the contiguous U.S. Round-trip airfare and hotel lodging are included. The reward also comes with a 30-day lease of a car from Subaru, the contest's sponsor.

The contest is already underway, with a leader board on the website keeping track of the competition. If you're looking to catch up, this national parks road trip route isn't a bad place to start.

Sydney Airport's New 'Quiet' Terminal Helps You Relax Before a Flight

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Picture this: You’re at the airport at 6 a.m., waiting in a too-long line for coffee, and announcements are blaring over the intercom. They’re loud, they’re annoying, and they won’t stop coming.

Fortunately for travelers Down Under, one airport is putting an end to the insanity. As Lonely Planet reports, Sydney Airport is the latest transportation hub to introduce a “quiet terminal” concept. Airport officials promise to broadcast only the most important announcements throughout the T1 international terminal.

“Passenger announcements have been significantly reduced, with boarding call and final call announcements confined to gate areas only,” the airport states on its website.

While this is good news for people who resent the constant reminders, travelers who have a habit of dawdling around in airport shops and losing track of the time will need to be more vigilant. In lieu of announcements, flight information will be provided on screens stationed throughout the terminal.

Airports in Singapore, Dubai, Hong Kong, and Helsinki have undertaken similar measures to cut down on noise and promote relaxation. After all, vacation starts at the airport.

[h/t Lonely Planet]

What Would Happen If a Plane Flew Too High?

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Tom Farrier:

People have done this, and they have died doing it. For example, in October 2004, the crew of Pinnacle Airlines 3701 [PDF]  was taking their aircraft from one airport to another without passengers—a so-called "repositioning" flight.

They were supposed to fly at 33,000 feet, but instead requested and climbed to 41,000 feet, which was the maximum altitude at which the aircraft was supposed to be able to be flown. Both engines failed, the crew couldn't get them restarted, and the aircraft crashed and was destroyed.

The National Transportation Safety Board determined that the probable causes of this accident were: (1) the pilots’ unprofessional behavior, deviation from standard operating procedures, and poor airmanship, which resulted in an in-flight emergency from which they were unable to recover, in part because of the pilots’ inadequate training; (2) the pilots’ failure to prepare for an emergency landing in a timely manner, including communicating with air traffic controllers immediately after the emergency about the loss of both engines and the availability of landing sites; and (3) the pilots’ improper management of the double engine failure checklist, which allowed the engine cores to stop rotating and resulted in the core lock engine condition.

Contributing to this accident were: (1) the core lock engine condition, which prevented at least one engine from being restarted, and (2) the airplane flight manuals that did not communicate to pilots the importance of maintaining a minimum airspeed to keep the engine cores rotating.

Accidents also happen when the "density altitude"—a combination of the temperature and atmospheric pressure at a given location—is too high. At high altitude on a hot day, some types of aircraft simply can't climb. They might get off the ground after attempting a takeoff, but then they can't gain altitude and they crash because they run out of room in front of them or because they try to turn back to the airport and stall the aircraft in doing so. An example of this scenario is described in WPR12LA283.

There's a helicopter version of this problem as well. Helicopter crews calculate the "power available" at a given pressure altitude and temperature, and then compare that to the "power required" under those same conditions. The latter are different for hovering "in ground effect" (IGE, with the benefit of a level surface against which their rotor system can push) and "out of ground effect" (OGE, where the rotor system supports the full weight of the aircraft).

It's kind of unnerving to take off from, say, a helipad on top of a building and go from hovering in ground effect and moving forward to suddenly find yourself in an OGE situation, not having enough power to keep hovering as you slide out over the edge of the roof. This is why helicopter pilots always will establish a positive rate of climb from such environments as quickly as possible—when you get moving forward at around 15 to 20 knots, the movement of air through the rotor system provides some extra ("translational") lift.

It also feels ugly to drop below that translational lift airspeed too high above the surface and abruptly be in a power deficit situation—maybe you have IGE power, but you don't have OGE power. In such cases, you may not have enough power to cushion your landing as you don't so much fly as plummet. (Any Monty Python fans?)

Finally, for some insight into the pure aerodynamics at play when airplanes fly too high, I'd recommend reading the responses to "What happens to aircraft that depart controlled flight at the coffin corner?"

This post originally appeared on Quora. Click here to view.

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