Circular runways

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Pyrrho
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Circular runways

Post by Pyrrho » Sun Apr 02, 2017 2:26 pm

http://www.endlessrunway-project.eu/
The main feature of the circular runway is that it will become possible to let an aircraft operate always at landing and take-off with headwind. Whatever its strength and direction, the Endless Runway becomes independent of the wind. When allowing limited crosswind, airspace users can shorten the global trajectory of the flights through optimized departure and arrival routes.
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Sure, why not?
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shemp
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Re: Circular runways

Post by shemp » Sun Apr 02, 2017 3:13 pm

Yeah, I don't see any possibility of planes sliding off the runway under rainy/snowy conditions. Greenlight it!
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Re: Circular runways

Post by Rob Lister » Sun Apr 02, 2017 3:20 pm

Why not? Maybe not such a bad idea for a small plane but consider a Boeing 747. Angular acceleration will be v2/r

What is providing the angular thrust when taking off or landing? The wheels? I don't think they're designed that way. So you'd have to have an inside angle -- like the curve on a nascar racetrack -- from which you would take off and land. Call it 20 degrees. When I try to picture that, it doesn't seem too safe.

Also, the pilot better get the starting point or landing point, as well as the roll axis, just right. Navy pilots can do that but even then the deck is straight and the wire corrects mistakes (sometimes quite dramatically [SLAM!]).

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Re: Circular runways

Post by Pyrrho » Sun Apr 02, 2017 3:52 pm

The flash of light you saw in the sky was not a UFO. Swamp gas from a weather balloon was trapped in a thermal pocket and reflected the light from Venus.

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Doctor X
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Re: Circular runways

Post by Doctor X » Sun Apr 02, 2017 8:03 pm

Angular momentum no longer exists?

A problem with a plane turning into a massive obstacle for a landing plane no longer exists?

I would find this more credible if "Freakin'" was inserted between the noun and its descriptor.

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Re: Circular runways

Post by ed » Sun Apr 02, 2017 8:15 pm

Why?
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Re: Circular runways

Post by sparks » Sun Apr 02, 2017 8:35 pm

Sounds like a "space planner" got involved.
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Re: Circular runways

Post by Abdul Alhazred » Sun Apr 02, 2017 9:13 pm

Has the circular runway thing been done on a small scale a long time ago?

With no plans of doing it big, that is.

I'm vaguely remembering something in Popular Mechanics (or something like that) in the 1970s.

Maybe the space planner read the same magazine as a kid? :)
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Re: Circular runways

Post by sparks » Sun Apr 02, 2017 9:18 pm

By (my admittedly limited) definition, space planners suck raw, smelly ass and are useless for anything except crab bait. Most useless people on the planet.

I mean, hell. Even terrorists manage to get it right once in a while.
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Re: Circular runways

Post by Pyrrho » Sun Apr 02, 2017 9:51 pm

My first thought was that it was an elaborate April Fool's joke.
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ceptimus
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Re: Circular runways

Post by ceptimus » Sun Apr 02, 2017 10:30 pm

Duplicate.
Last edited by ceptimus on Mon Apr 03, 2017 5:05 pm, edited 1 time in total.

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Re: Circular runways

Post by ceptimus » Sun Apr 02, 2017 10:31 pm

Not an April Fool thing - it was in a feature on the BBC website a week or so ago. Runway is banked so that at take off/landing speed there is no side load on the wheels.

[youtube][/youtube]

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Re: Circular runways

Post by sparks » Mon Apr 03, 2017 12:29 am

Now there's 3 minutes I'll never get back.

Fuck!
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Re: Circular runways

Post by Rob Lister » Thu Apr 06, 2017 11:33 am

I happened upon this question to Quora and thought I'd post it.
Question: How many fatal accidents can be traced to pilots failing a crosswind landing?

Crosswind landings are common and pilots are trained to do them routinely. But do you know of any cases where a crosswind landing has gone terribly wrong?
https://www.quora.com/How-many-fatal-ac ... nd-landing

Tom Farrier, Retired US Air Force command pilot; Current aviation safety contractor for the government;...more...answers verbosely giving background for the problem and the results of his research. He advises"
Let me hasten to point out that not one of the accidents I found involved a major air carrier, and only a handful involved any commercially operated aircraft -- not one involved what most people would think of as an "airliner." In fact, only 16 of the accidents in the 113 I reviewed actually involved loss of life resulting from too-strong winds encountered during a landing attempt.

Bottom line: adverse winds on landing only accounted for about 0.4% of the fatal accidents in the ten-year period of 2003 through 2012. A pilot landing anywhere a wind indicator of any type is visible, the winds are being reported by a ground observer, or it's possible to perceive his/her aircraft "crabbing" severely during descent on final shouldn't fall prey to this kind of accident.
So this is a complicated and costly solution to a non-problem. And it looks like the solution would likely come with its own set of problems.

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Re: Circular runways

Post by Anaxagoras » Thu Apr 06, 2017 12:09 pm

I think the idea is interesting enough to at least consider, that's how we make progress, not by assuming that the current way we do things is the best possible way. That said, I agree that probably this creates at least as many problems as it solves.
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Re: Circular runways

Post by Anaxagoras » Thu Apr 06, 2017 12:21 pm

Would this airport require more land than the current configuration? And is that really the best marginal use of that extra land? What about getting into and out of the airport? Tunnels under the runway? Is the total cost going to be higher? If so, is it worth the extra cost?

And so on.
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Re: Circular runways

Post by Anaxagoras » Fri Apr 07, 2017 3:19 am

Not a new idea:

Popular Science, 1966
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Re: Circular runways

Post by Doctor X » Fri Apr 07, 2017 4:30 am

A plane has to make an emergency landing. . . .

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Re: Circular runways

Post by ed » Fri Apr 07, 2017 9:54 am

Pyrrho wrote:http://www.endlessrunway-project.eu/
The main feature of the circular runway is that it will become possible to let an aircraft operate always at landing and take-off with headwind. Whatever its strength and direction, the Endless Runway becomes independent of the wind. When allowing limited crosswind, airspace users can shorten the global trajectory of the flights through optimized departure and arrival routes.


Sure, why not?
First this:
The main feature of the circular runway is that it will become possible to let an aircraft operate always at landing and take-off with headwind.
then this:
Whatever its strength and direction, the Endless Runway becomes independent of the wind.
Can't have it both ways. Also, the wind vis a vis the aircraft is constantly changing.

Finally, this:
When allowing limited crosswind, airspace users can shorten the global trajectory of the flights through optimized departure and arrival routes.
This last isn't english. It sounds a bit like a priest explaining transubstantiation.
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Rob Lister
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Re: Circular runways

Post by Rob Lister » Fri Apr 07, 2017 10:22 am

ed wrote:
Finally, this:
When allowing limited crosswind, airspace users can shorten the global trajectory of the flights through optimized departure and arrival routes.
This last isn't english. It sounds a bit like a priest explaining transubstantiation.
It isn't goodly English, for sure. Better

Where there is little or no crosswind, airliners can take off in the same direction of their destination rather than at some tangent to it.

I suppose that might save a little fuel.