High Angle Attack Airfoil

[Retro]

Looking for a subsonic cambered airfoil that has good lift at up to 15-20 degree angle of attack without stalling. Switch blade wings for use with delta lifting body. Need to enhance lift during lift-off, landings and subsonic glide.

 

[mohr]

Hi Retro :

Check NASA TM X-74018 ( ABOUT LS (1)- 0413 AIRFOIL ). This
airfoil may fullfill your requirements and the information can be downloaded free from NASA technical server.

Cheers

 

[Retro]

Thanks mohr,

Found the pdf file of that report. Will take sometime to absorb it. I'm more familiar with NACA airfoils, I assume the LS (1)-0413 is based on the Whitcomb supercritical design? The C-17A transport uses a supercritical airfoil. Something similar may work well in my application.

 

[rb1957]

i'd suggest that if you want a high cruise mach number (suggested by using a super-critical airfoil) and high angle of attack (why?) then maybe you should think about a L/E device (a slat), maybe of the automatic variety.

 

[Retro]

The wings are only deployed during take-off and initial ascent up to M<.8. Beyond transonic they are stowed and lifting body is sufficed for supersonic cruise. Maybe used during descent, decel again M<.8 to extend glide range. Not required for landing with empty vehicle. Addition of high devices on switchblade wings maybe beneficial. It would be a trade off of lift/drag and additional weight and complexity.

 

[rb1957]

if their primary use is take-off and climb, you could jettison them and save the weight on the rest of the mission.

if they pivoted (like the h.stab. on most jets today, or like the tail-booms on burt's space-craft) that would increase the AoA range on a reasonably conventional airfoil.

to me high AoA means large L/E radius which is probably inconsistent with efficient flight at reasonable Mach numbers.