PPL theory 8 of 9: Principles of flight

PPL theory 8 of 9: Principles of flight

25 min Calm

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Why the aircraft flies and why it stops flying. Lift, drag, stalls, spins, stability and the effect of flaps and load factor.

Een vliegtuig dat langzaam invliegt op finale voelt anders dan hetzelfde toestel in cruise, ook al zit je op dezelfde hoogte. De stuurkolom staat verder naar achteren, de neus iets hoger, en ergens in die houding schuilt een grens die je nog niet kunt zien maar wel kunt leren herkennen. Principes van vlucht gaan over precies dat: begrijpen waarom de vleugel draagkracht genereert bij een bepaalde instroomhoek, wat er met weerstand gebeurt als je snelheid daalt, en op welk moment de luchtstroom loslaat van het profiel en de vleugel zijn werk niet meer kan doen.

Dat begrip zit niet alleen in formules. Het zit in het kunnen tekenen van een totale weerstandscurve, in weten waarom een bocht de overtreksnelheid verhoogt, en in herkennen wat kleppen doen met de balans van het vliegtuig. Wie deze principes doorgrond heeft, leest zijn instrumenten anders, en voelt eerder aan wanneer het vliegtuig je iets probeert te vertellen.

Explain lift with angle of attack and airflow, without using the word Bernoulli as a magic spell.

Suggestion: If you cannot explain a stall, start here.

Study the four types of drag and how speed changes each one. Draw the total drag curve.

Suggestion: Mark best glide speed on your curve.

Understand the stall: angle, warning, recovery, and why a turn raises stall speed.

Suggestion: Calculate stall speed in a 60 degree bank.

Learn what flaps, trim and stability (static and dynamic) do to the aircraft.

Suggestion: Relate each one to something you felt on a flight.

Ten practice questions on principles of flight.

Suggestion: Draw first, then answer.

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by PlayTryBe team