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

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Presentation transcript:

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

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

VD VDf VNE Design Speeds

VA MAX MANOEUVRE 5.3G Full deflection of any ONE control - Va Always same or higher than Vb

GUST LINE +29knt +14.6knt Rough air speed - Vb Vb

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

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

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)(Dg300) Vne is a fixed value, not related to air density

Effect of Airbrakes / Flaps

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