Why are the power and drag curves called polars?

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  • See Wikipedia:Drag polar and Wikipedia:Polar curve (aviation) for example. These curves are not on a polar coordinate system. Why are they called polars?

  • agents that are called into speculation: Aluminium based aerosols Mono-atomic gold Barium Nano aluminum-coated fiberglass Radioactive thorium Cadmium Chromium Nickel Desiccated blood Mold... is the actual catalyst supposedly spraying these things? Sources Chemtrail Planet Collective Evolution Wikipedia

  • Winglets are used to reduce induced drag on the main wings of an aircraft as per explanations on wikipedia. Since they are very effective I was wondering why they are not installed also on horizontal stabilizers. For sure there must be some sort of induced drag being generated on horizontal stabilizers too as they are cutting through the air just as the main wings do. So why aren't there any sort of "minified" winglets available as an aftermarket installation (or, at least, I haven't ever seen some myself)?

  • In February 2014 a co-pilot hijacked Ethopian Airlines flight 702 and took it to Switzerland. Now in March there is some speculation that Malaysia Airlines flight 370 may have been hijacked and destroyed by the pilots - maybe they took a nose dive into the Andaman Sea? So my question is this: is there an automatic or say anti-pilot warning system on commercial airliners? In other words, a system that is non-maskable (can't be disabled by the pilot) and which will automatically warn ATC about unexpected conditions (like a sudden decrease in altitude)?

  • Here is a $C_L$ / $AoA$ curve that I took from Wikipedia. The better textbooks say that a stall is that condition in which a further increase in angle of attack will result in a reduction of lift. The point at which that transition happens is known as the critical angle of attack. Theoretically, sustained flight is possible at angles beyond the critical angle of attack - take a look... curve without an angle of attack indicator? Or to ask the question another way, Is there a practical way to tell when an airplane has exceeded the critical angle of attack without an AoA meter?

  • How does autobrake work? Gabriel Brito

    An autobrake is a type of automatic wheel-based hydraulic brake system for advanced airplanes. The autobrake is normally enabled during takeoff and landing procedures, when the aircraft's longitudinal deceleration system can be handled by the automated systems of the aircraft itself in order to keep the pilot free to perform other tasks - Wikipedia How does the aircraft "know" when is time to activate the autobrake systems on a rejected takeoff and landing? Does it apply full brake to all the aircraft's wheels? Is it really used by commercial jets?

  • I'm very interested to learn if there are (m)any (major) (commercial) airports that have runways further away from the terminal(s) than Schiphol's Polderbaan. Which airport is "in the lead" in this respect? The northern end of the Polderbaan, the last runway to be constructed, is 7 km (4.3 mi) north of the control tower, causing taxi times of up to 20 minutes to the terminal. [...] Newest runway, opened 2003. Located to reduce the noise impact on the surrounding population; aircraft have a lengthy 15-minute taxi to and from the Terminal. Wikipedia

  • Lead in gasoline for automobiles has been banned from nearly every corner of the world, with most bans dating from the nineties. Why are we still poisoning ourselves with lead in Avgas? I understand that Tetraethyllead (as it's apparently technically called) is an octane booster, but the Wikipedia article also mentions that advances in the production of high octane unleaded fuel have pretty much..., that they must get their fix of lead before they go flying? It is also a fact that there are aircraft piston engines which do run perfectly fine on unleaded fuel, why is it that hardly any airport

  • My only detailed experience with carburetors is in aircraft. I'm pretty familiar with the principles behind float-type carbs, but I recently saw a schematic for a "downdraft carburetor" with a choke valve. This got me curious, so I did a little research and found that what I'm used to is an "updraft carburetor", and that (according to wikipedia) they fell out of fashion in the automotive industry in the 1930s. Why is the updraft carburetor design so prevalent in aviation? Does an updraft carb actually have a choke valve? Images below to provide a little context for those of us who

  • How do flying wings, like the B-2 Stealth bomber, actually keep themselves from yawing out of control without a vertical stabilizer? For the record, I assume this has to be a simple mechanics process. Why? Well flying wings go all the way back to the 30s. One of the earliest (and my personal favorite) is the N-9M, which was a scale model of the XB-35, a prototype bomber for the allies during WWII. They didn't have flight control computers back then, and the only control complaints I recall them having is that early versions had a tendency to flip over backwards when approaching stall

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