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THE FLIGHT ENVELOPE

THE FLIGHT ENVELOPE. WHY WE NEED TO DEFINE LIMITS THE MANOEUVRING ENVELOPE DESIGN DIVE SPEED MANOEUVRING AND ROUGH AIR GUSTS AND LAUNCHING STRESSES PLACARD LIMITS ALTITUDE FLAPS / AIRBRAKES. THE FLIGHT ENVELOPE. WHY WE NEED THESE DEFINED LIMITS Material limitations

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THE FLIGHT ENVELOPE

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  1. THE FLIGHT ENVELOPE WHY WE NEED TO DEFINE LIMITS THE MANOEUVRING ENVELOPE DESIGN DIVE SPEED MANOEUVRING AND ROUGH AIR GUSTS AND LAUNCHING STRESSES PLACARD LIMITS ALTITUDE FLAPS / AIRBRAKES

  2. THE FLIGHT ENVELOPE WHY WE NEED THESE DEFINED LIMITS Material limitations Acceptable load Damage load Failure load Pilot limitations Complex loads in turns Air movements Landing shocks

  3. THE FLIGHT ENVELOPE

  4. Design Speeds THE FLIGHT ENVELOPE VDf VD VNE

  5. MAX MANOEUVRE THE FLIGHT ENVELOPE VA 5.3G Full deflection of any ONE control - Va Always same or higher than Vb

  6. Rough air speed - Vb THE FLIGHT ENVELOPE Vb +29knt +14.6knt GUST LINE

  7. THE FLIGHT ENVELOPE G Relief - increasing weight offsets increased load So Vw (Max Winch)is calculated to ensure the glider is not overstressed on launch

  8. THE FLIGHT ENVELOPE • The Aircraft Placard • Velocities • Vne (Never exceed ) • Va ( Max Manoeuvring ) • Vb (Rough Air) • Vw / Vt ( Max winch and max aerotow) • Weights • Aerobatic Category

  9. THE FLIGHT ENVELOPE • Effect of Altitude • ASI measures air not speed • Air gets thinner so ASI underreads • 1.5%/1000ft • Lift is function of air density • Flutter (Dg300)is related to air velocity not density(amount) • Vne is a fixed value, not related to air density

  10. Effect of Airbrakes / Flaps THE FLIGHT ENVELOPE

  11. THE FLIGHT ENVELOPE WHY WE DEFINE LIMITS THE MANOEUVRING ENVELOPE DESIGN SPEEDS MANOEUVRING AND ROUGH AIR GUSTS AND LAUNCHING STRESSES PLACARD LIMITS ALTITUDE FLAPS / AIRBRAKES QUESTIONS

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