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  • #31
    ... keep 'em coming guys.



    All our final decisions are made in a state of mind that is not going to last (Marcel Proust)

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    • #32
      Originally posted by T.O.G.A. View Post
      They also say that: "Landings are nothing but controlled crashes into terrain".
      About twenty years ago a friend, who was a spacecraft engineer, died in a small aircraft accident. At his memorial service is was said that "he died when his plane colllided with one of the planets in the solar system."

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      • #33
        and....

        Helicopters don't fly, they simply beat the surrounding air into submission !

        also....

        Helicopters are merely 20,000 component parts built by man, desperately trying to kill the man who built them !
        If it 'ain't broken........ Don't try to mend it !

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        • #34
          Velocidad y altura
          conservan la dentadura.

          --- Judge what is said by the merits of what is said, not by the credentials of who said it. ---
          --- Defend what you say with arguments, not by imposing your credentials ---

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          • #35
            Originally posted by brianw999 View Post
            and....

            Helicopters don't fly, they simply beat the surrounding air into submission !

            also....

            Helicopters are merely 20,000 component parts built by man, desperately trying to kill the man who built them !
            A test pilot I knew said helicopters were a "bunch of loose parts flying in formation."

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            • #36
              The ten commandments of flying

              1. Thou shalt abstain from the intersection takeoff for,
              verily, the runway behind thee, as the altitude above thee,
              cometh not to thine aid when thou needest them.

              2. Thou shalt not linger on active runways
              lest thou become like unto ground sirloin.

              3. Ignorest thou not thy checklists for many
              are the switches, handles, gauges and other demons
              awaiting to take cruel vengeance upon thee.

              4. Thou shalt cast thine eyes to thy right and also to thy left
              as thou passeth through the firmament
              lest thy fellow pilots bring flowers to thy widow
              and comfort her in other ways.

              5. Buzzeth not, for this shall surely incur the wrath
              of thy neighbors and the fury of the FAA
              shall be called down upon thy head.

              6. Thou shalt be ever mindful of thy fuel lest there be nothing
              in thy tank to sustain thee upon the air and thy days be made short.

              7. Trust not thine eyes to lead thee through the cloud
              lest the Archangel Gabriel await thee therein.

              8. Thou shalt not trespass into the thunderstorm
              lest the tempest rend the wings from thy chariot
              and cast thee naked into the firmament.

              9. Put not thy trust in weather prophets,
              for when the truth is not in, then they shall not
              accompany thee among thy ancestors.

              10. Often shalt thou confirm thine airspeed on final
              lest the earth rise up and smite thee.

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              • #37
                And the Ten commandments for flying helicopters

                1. He who inspecteth not his aircraft giveth his angels cause to
                concern him.

                2. Hallowed is thy airflow across thy disc restoring thine
                Translational Lift.

                3. Let infinite discretion govern thy movement near the ground,
                for vast is the area of destruction.

                4. Blessed is he who strives to retain his standards, for
                without them he shall surely perish.

                5. Thou shalt maintain thy speed whilst between ten and four hundred
                feet lest the earth rise and smite thee.

                6. Thou shall not make trial of thy centre of gravity lest thou
                dash thy foot against a stone.

                7. Thou shalt not let thy confidence exceed thy ability, for broad
                is the way to destruction.

                8. He that doeth his approach and alloweth the wind to turn behind
                him shall surely make restitution.

                9. He who alloweth his tail rotor to catch in the thorns curseth
                his childrens children.

                10. Observe thou this parable lest on the morrow thy friends mourn thee.

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                • #38
                  Originally posted by SYDCBRWOD View Post
                  On landing a plane is in a very low energy state (in some ways you could liken it to riding a bicycle - the slower you go the more difficult it is to remain upright) - it is essentially transitioning from flying to 'driving'. To do so you need to slow to the point where the wings no longer support the aircraft and it needs wheels. Ideally, this happens on or in very close proximity to the runway. When a plane is travelling that slowly before landing the wings are only developing just enough lift to keep the plane in the air. A sudden change in wind direction and speed can remove some of that lift. Not really that much of an issue if you were at 20,000 feet, but in landing you may have noticed that the ground gets very very close (kinda part of the whole landing thing), take away a whole stack of lift due to a microburst when you are close to the ground and very slow and you end up dropping short of the runway as a DC10 did in the 1980's. At 20,000 feet you have altitude and airspace to recover.

                  At 20,000feet at normal cruising speeds if you need to avoid something you have all options available to you: up - because you can trade airspeed for altitude very easily, down - because you have space below you, and left or right are self explanatory. When landing you do not have the altitude to avoid by going under, you do not have the airspeed to climb a great deal, and a sharp turn left or right may result in stalling a wing. A modern jet engine will need a few seconds to spool up and develop full power to gain you that airspeed to give you the airspeed to manouvre.

                  When landing an aircraft needs to touch down on a tiny strip of concrete - if there is fog, cloud, rain or crosswinds that becomes so much more difficult. At 20,000ft these same conditions are not anywhere near as dangerous.
                  Most of this is true during takeoff as well, or? I remember once a pilot told me that (for him) actually take-off is the most tense phase of the flight, the stress on aircraft components being much greater than during landing, engines having to work at full capacity and so on.

                  Also, I do not kow the numbers but subjectively I sould say that alot of accidents also happen during the very first minutes or even seconds into the flight (prominent examples being spanair, concorde) - and teh chance of surviving appears much lower than when experiencing a landing accident.

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