the flight envelope
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/1.jpg)
•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
![Page 2: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/2.jpg)
•WHY WE NEED THESE DEFINED LIMITS•Material limitations
• Acceptable load •Damage load•Failure load
•Pilot limitations•Complex loads in turns•Air movements•Landing shocks
![Page 3: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/3.jpg)
![Page 4: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/4.jpg)
VDVDf
VNE
Design Speeds
![Page 5: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/5.jpg)
VA
MAX MANOEUVRE
5.3G
Full deflection of any ONE control - Va
Always same or higher than Vb
![Page 6: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/6.jpg)
GUST LINE
+29knt
+14.6knt
Rough air speed - Vb
Vb
![Page 7: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/7.jpg)
G Relief - increasing weight offsets increased load
So Vw (Max Winch)is calculated to ensure the glider is not overstressed on launch
![Page 8: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/8.jpg)
The Aircraft Placard •Velocities
•Vne (Never exceed )
•Va ( Max Manoeuvring )
•Vb (Rough Air)
•Vw / Vt ( Max winch and max aerotow)
•Weights
•Aerobatic Category
![Page 9: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/9.jpg)
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
![Page 10: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/10.jpg)
Effect of Airbrakes / Flaps
![Page 11: THE FLIGHT ENVELOPE](https://reader036.vdocuments.mx/reader036/viewer/2022082202/56813b4d550346895da43ca7/html5/thumbnails/11.jpg)
•WHY WE DEFINE LIMITS•THE MANOEUVRING ENVELOPE •DESIGN SPEEDS•MANOEUVRING AND ROUGH AIR •GUSTS AND LAUNCHING STRESSES•PLACARD LIMITS•ALTITUDE•FLAPS / AIRBRAKES
QUESTIONS