Vortex Generator position VG

[tx_swordguy]

Ok point taken. Call them basket salesmen for all I care. My vgs are ahead of the highest point of the wing when sitting 3pt. I have no idea if it stalls in that attitude or not, I believe it is much more tail down when it stalls. I followed the instructions from the site I got mine from and it worked out well for me. Your mileage my vary so do what you want

[GMKman]

You can use double sided tape to temporarily experiment with various placements ( which is what I did). I lost one or every once in a while but was worth the data. I found that the more forward/ the more effective however it came with a cost of more drag. I inevitably didn't like the look or the drag of them and didn't feel like they made much difference so off they came with no harm to the wing from the sticky tape.
I did put some on the bottom of the elevator which made a difference in authority ( I still have the small elevator with a continental engine up front).
I "glued" them on permanently now. I'm happy with them.

[redbowen]

Here is a video I put together showing a VG installation. Hopefully it is helpful.

https://www.youtube.com/watch?v=vGzHZKRZi7s

I also started a new thread for it here.

http://www.teamkitfox.com/Forums/sho...1255#post71255

[DesertFox4]

Great video Bryan.

The larger elevator would be a good mod to increase elevator authority in the flair.

[jrthomas]

I installed Stolspeed vg's yesterday and thought some of you might be interested. I installed mine about 2 and a half inches from the leading edge. I used the 90mm spacing except for the 24 inches from the wingtip where I used the 60mm spacing. My flight testing was not under ideal conditions since it was mid day, well into the 90's and thermals making things pretty bumpy but the results seem to be pretty impressive so far. Stall with zero flaperons went from 45 mph to 40. There was a tremendous increase in angle of attack before stall with the vg's, especially with flaperons, so obviously they're working. I don't have any exact stall numbers with flaperons down because of the thermals and the wind changing directions. I was into the mid to upper 30's but I'd like to try it again in more calm air before giving any exact numbers. It's just amazing how it hangs in the air at that speed and AOA. Oh, I'm flying a Model 4/1200, 912ul, long wing but with all the Speedster options so it's a little heavier than some. James Thomas

[Hockeystud87]

Great info! I was thinking about VG's at some point as well... Lowering your stall is never a bad thing!

Any issues on the top end? Speed decrease?

[jrthomas]

I plan on flying tomorrow so we'll see how it does and maybe post my results tomorrow night.

[GMKman]

You can use double sided tape to temporarily experiment with various placements ( which is what I did). I lost one or every once in a while but was worth the data. I found that the more forward/ the more effective however it came with a cost of more drag. I inevitably didn't like the look or the drag of them and didn't feel like they made much difference so off they came with no harm to the wing from the sticky tape.
I did put some on the bottom of the elevator which made a difference in authority ( I still have the small elevator with a continental engine up front).
I "glued" them on permanently now. I'm happy with them.

I need to retract some of this statement. I installed Stolspeed vg's on my wing now in pretty much the same place Bryan did in his video and DEFINITELY like the improvements in lower stall speeds, low speed stability, and no real drag increase. Not sure why the other vg's I tried didn't work as well but I'm glad I have these on my wing now.

[NinerBikes]

Ed, did you end up yet with these being installed?

I don't remember looking for them on Saturday.

Or will you fly first, get some measurements, and then install at a later date, so you can note and log the stall speed difference between clean and Stohlspeed installed a few inches back?

[efwd]

You know what, I enjoyed this build a bit too much I think. I am certainly not demonstrating the same drive to get it flying as you all well have noticed. I am not yet ready in my piloting skills now that I have not flown since April. Winter may delay me from flying with Paul so Im not rushing. I may need to get a check out in a Citabria down here in Southern CA where the weather is great for flying year round except winds. I have left a few things on my plane that will be done in the future. I like the thought of having the set up I have and will add Vortex generators, T3 tailwheel, in flight adjustable prop for some fun tinkering at a later date. I need to get my but flying so I am comfortable with the first flight.