Dropping 15kts off your stall speed....

[Midniteoyl]

So, someone finally got around to figuring out how to properly install stollspeed.com VGs on an Express. And the results were close to amazing..

This was posted by [FONT=Verdana,Arial,Helvetica][FONT=Verdana,Arial,Helvetica]Werner Maag of Switzerland on the Express Builders forum. Note, that this is an Express CT and the wing is different now and the results on the newer one prolly wont be as dramatic. Also note the absolutely TONS of leg room the cameraman has in the back seat, and that they have 3 on board and are still 200 pounds under gross :whistle:. Man I love this plane!

Edit: the movie link is the 'MobleMe Gallery' at the bottom

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[FONT=Verdana,Arial,Helvetica][FONT=Verdana,Arial,Helvetica]Hallo Gentlemen
As Henri Walser is now testing his new CT Type Express, they tried to tame it's habits a bit with implementing some Vortex Generators VGS on the lower horizontal stabilizer, the rudder and finally the wings. Have a look at the video in u-tube filmed by our Swiss Vortex Guru Viktor Strausak and you won't beleave the difference in the pattern of the wool strings! It noe seems to be fully flarable with low speed, hold the nose wheel up after landing and would make it more suitable for very short runways and grass!

Viktor reports: VGs on Express-CT

HB-YMH Express CT
Motor Continental IO 360 ES1B, 6 Zyl, 210 PS
MTOW 1451 kg. Cruise ca. 140 kt, VNE 210 kt.
NACA Profile
Wing 4.2m, initially VGS on outer 2.0m (outside orange strip on video in front of aileron area)


Test TOW 1360kg, 3 Personen, mid CG

Stall with VGs (Stall no VGs)

clean idle 45kt, (60kt)
Fl10,T/O idle 43kt
Fl40,Ldg idle 42kt (55kt)

Power 60%
clean 40kt (55)
Fl10,T/O 38kt (55)
Fl40,Ldg 38kt (55)

Power MCT
Clean 40kt
Fl10, 38kt


the link is

MobileMe Gallery

I hope the link works.
I will be on the road in Canada and US til end of july, so no regular contact posible, but Henri Walser is probably ready to tell the story.

Werner Maag[/FONT][/FONT]