Installing the little VG pieces

[LoonyBob]

The load (forces) on VGs are very small; ~2gm at 80kt for those pictured. Double sided tape is certainly the go for short/medium term experimental attachment, which is where most of my experience lies.

I wouldn't be too touchy about the exact orientation; Vortex Generators are little wingtips, which generate a tip vortex, best with an AoA of ~30 degrees to the local flow. Square or delta, they all work pretty much the same. When they are fitted as opposing pairs, the vortii(??) are meant to pump air on to the surface between/"behind" the VGs. The spacing is actually more important than the AoA.

 

VGs on the HS to increase its Clmax are old news. Since VGs on the underside do nothing to help stall/spin recovery, a bigger HS (or restricted CG range) is normally preferred. The Savannah's rear fuselage provides both a bit of stall recovery and a bit of spin damping, i wouldn't get too excited.

[Neil_S]

21 hours ago, LoonyBob said:

 the vortii(??)

Hi Loonybob,

 

"Vortices" - sorry, many years of painful Latin lessons at school forced me to tell you......

 

Cheers,

Neil