L-39 speeds reference?

[francesco.fgmc]

Hi there.

 

I've been looking for the Vx, Vy and longest glide speed of the Albatros, with no luck.

Does anyone know where I might find them?

 

Thank you! :)

Have a nice day.

[Ramsay]

AFAIK there are 3 'main' publications available for free on the internet.

 

Aero-L-39-Flight-Manual.pdf

http://www.anythingaboutaviation.com/pilot-operating-handbooks/

 

L-39ZA Pilot Manual 1990.pdf (Book 1, Part 2)

http://www.code1aviation.com/index.php/publications

 

l-39_rle.zip (Russian Pilot Manual)

http://www.airwar.ru/other/bibl/l-39_rle.html

 

The T.O. 1T-L39C-1, Aero-L-39-Flight-Manual, Part 6 - descent charts show

 

Maximum Range - Idle

Drag Index 0, 291km/h Descent Speed

Drag Index 30, 285km/h Descent Speed

Drag Index 60, 279km/h Descent Speed

 

For a windmilling engine or locked rotor

Max Time to descend at approx. 220 km/h EAS @ 4000m

Max Distance during descent at approx. 290 km/h EAS @ 4000m

 

For best climb rate there are similar charts but I prefer to use the method described in the L-39ZA Pilot Manual

 

 

• 
  
• Maximum Power - 106% (20 min max), then 103% Max sustained
  
• 400km/h IAS until 500km/h TAS (thin airspeed needle)
  
• then maintain 500km/h TAS (allowing IAS to fall)
  
• Air speed is controlled by pitch/ascent rate
  

Note: Glide/drag ratios are covered in DCS_L-39_Flight_Manual_EN.pdf Emergency Procedures - Forced Landing, Page 278 which show a maximum glide ratio of 10 for a clean aircraft @ 300 km/h.

Edited March 21, 2016 by Ramsay
typos