Question about FAA 3rd Class Medical? If you cross your head (back of the head, front of the head, right temple, left temple), then the headache will go away. Plus blood is purified. To make upright perpendicular cross: using your right hand in the following way (picture below) cross yourself: touch firmly your forehead and say "In the name of the Father", touch firmly 1cm-2cm above belly button and say "and of the Son", touch firmly right shoulder (where 3 bones meet) and say "and of the Holy", touch firmly left shoulder (where 3 bones meet) and say "Spirit". Hand down: "Amen." Feet together.

According to Vyacheslav Krasheninnikov, vodka dries one's brains. Smoking is censer for the devil. People who use drugs see demons who cleverly disguise themselves as aliens. Vaccines, IVs, tooth fillings, cosmetics, certain foods and drinks, medicaments, etc. contain nanochips and/or cells of aborted fetuses; intake of which leads to demon possession. If a dog is present in house or church, then the Holy Spirit will leave. Foul language calls upon Pagan deities (demons); Holy Spirit departs on seven meters. Blood contains sins; don't donate blood; don't accept blood transfusion yourself.

Raw celandine (juice) cures cancer in minute amounts (like eating a leaf a day for 10 days, taking a break for 10 days, repeating three times); store this raw juice in dark glass container in a fridge for up to 2 or 3 years; add only hot water if you don't want to drink it cold; collect older celandine that is at least 20 meters away from the river from morning until 3 PM. Zodiac is planetary prison of demons; don't believe in horoscopes or you'll exhibit the traits of the trapped demons. Luck = Moloch = demon; don't wish people luck, please. Chanting mantras leads to demon possession; it's not the words that get you possessed; it's the rhythm. Meditation, hypnosis, astral projection, etc. lead to demon possession. Demons pretend to be ghosts and aliens. Barcode is Druid black magic curse. Most thoughts and dreams are from demons; demons never do good.

Oral, anal, masturbation, porn, fornication, adultery, fetishes, cross dressing, etc. lead to demon possession. Sionists want to be the only white people. So, they promote contraceptives (early abortion), interracial marriage, homosexuality, abortion (aborted babies go to hell for 33 and a half years and a demon is freed from hell), etc. America will be last country to switch to Euro (antichrist's world currency). Sionists want to attack Iran. So, they need an excuse, which will be the Statue of Liberty. New Sodom (New York) will be flooded after an explosion in the sea; New Gomorah (Los Angeles) will follow after. Look at what Seraphim Rose had to endure. He was a homosexual, but repented. Now, he is one the great saints of the Orthodox Church. Pray to Seraphim Rose; he'll help you. Give to charity in the name of Archangel Michael; he rescues people from hell twice a year (or brings them up a level, that is, to a level with less punishment; eventually, people are freed). Feed the pigeons; when pigeons bow down, people are saved from hell. Birds participate in time creation. It's a sin to kill birds. Dinosaurs live under our level.

They will get out through sinkholes and lakes. To kill them, go for their nerves. Save the birds; but kill the dinosaurs. First dinosaur will come out of Volga River in Russia. Since antichrist (born to a 12th generation prostitute, flying, big-nailed, gloved, pale-faced, red-eyed, Satan-possessed since he's 12 years old, homosexual man from the tribe of Dan, who wears blue robe over left shoulder while red/pink robe is underneath just like Jesus, and is surrounded by demons but people see angels of light) is around, there is no need for disputes. 666 is not forgivable; it leads to permanent hell. 666 is given with World Passport with no name on it (grey plastic card). Police 666 people on highways. Food stores and prisoners (released by the antichrist) 666 people too. Reject vaccines. Don't go into UFO to be healed by demons. Hide with Orthodox Christians to escape 666; leave all electronics behind so that antichrist's minions can't track you.

Stay away from cats because one can receive mark of the beast because of cats. Pray the Jesus prayer slowly all the time. Sleep fully clothed; also, pray to your guardian angel to have normal sleep. Dress appropriately for your gender. Women wear non-revealing dresses and head-scarfs tied at the front; no pants and no hats for women. Men wear pants and hats (outside only, except priests). Don't get any tattoos. Reject new documents and vaccines. Ask Orthodox Christian priest to bless your house. Get rid of all Occult stuff (ouija boards, talismans, amulets, barcodes, skulls, masks, astrology books, tarot cards, etc.). To break any curse, pray slowly the Psalm "The LORD is my light and my salvation" 40 times a day for 40 straight days. That's 1600 times in total. Forgive me.

https://youtube.com/watch?v=8dub8PF2d8E
http://fatheralexander.org/graphics/sects_e.pdf
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I would not care which one it is -

I am a retired pilot, and just concerned about getting free or reduced rates benefits and privileges -
So whichever airline offers lower rates and has 787 or A350... I do not care -

I used to fly old 747's from the Jurassic era -
I would not know how in hell to handle a A350, or even a 787...
My wife and I are only interested in the wines and catering in first or business class -.

These are engineering criteria dealing with mechanical failure, they are probably useful things to know in aircraft design, but way outside the detailed knowledge of pilots on this forum.

Any explanation of Von Mises or Tresca is going to be highly mathematical and complex, well beyond the scope of YA

The winglets reduce drag.

Because the air pressures above and below the wing are different, the surrounding air tends to flow along the wing, inwards on top of the wing and outwards below the wing, Where these flows meet, at the wingtip, they form a vortex, a kind of horizontal mini-tornado.

This is where it gets complicated. Producing that vortex takes energy and the energy comes from the movement of the wing. That use of energy means that there is less energy to be used to make the wing go forward, in other words, there is energy working against the movement of the wing. We call that energy ''Drag''.

The winglet is designed to either, stop the two flows mixing, or, to reduce the size of the vortex and thus the energy used to create it, thereby reducing the drag.

They can even be a bit cleverer than that, because they can also have a positive angle of attack and themselves produce lift in the direction the wing is traveling, not only reducing the energy wasted in drag, but actually producing a nett thrust.

To my opinion, helicopters are harder to fly than airplanes -

In the 1970's, I had a girlfriend who was helicopter pilot for TV traffic reporting in Los Angeles -
She had no fixed wing background at all, she flew helicopters only -
I was then airline 707-727 F/O, and was KC-135 command pilot in the AF Reserve -
She offered to teach me to fly helicopters -

I flew 3 times with her, some 3 hours total... told me to abandon... a worthless fixed-wing idiot...!
I had tried twice in Bell 47D - and once in a Jet Ranger 206 -
Except for briefings, she gave me NO training theory about flying a helicopter -
Her technical explanations about helicopter operation were like Hebrew to me - My excuse...!

I have flown many types of airplanes - consider them much easier to handle than helicopter -
To me, the Jet Ranger (turbine) seemed easier to handle than a Bell-47 -

Of all the airplanes I flew, the 747 was probably the easiest to handle (very stable and forgiving) -
Any and all landings in a 747 are smooth and gentle -
The worst civilian airplane I ever flew (unstable) was the Learjet 23/24 -
Do not ever think a Learjet 23/24 is a centerline thrust airplane, it has a very high VmcG...!

The way turboshaft engines are designed, there is essentially no thrust left in the exhaust. Since that power is all directed to the shaft and therefore to the rotor, it makes more sense to get the propulsion from said rotor than trying to count on the exhaust of the engine, which would actually be working against you when hovering, or landing, where you do NOT want any forward thrust anyway.

There is zero advantage to gain from reducing the % power that goes to the rotor and direct it to the thrust, plenty of inconvenience and efficiency losses, so that is pretty much why we don't do it.