RE: FEJ 1/5,5 scale stabilator help required
 

Fantastic Mhm !

Exactly what I was looking for !
I am using the same soft. Here is a vidcap of my simulation made with the Xfoil direct analysis option:

http://www.geohei.lu/olin/data/model...0F-16%20cp.avi

Let me know what you think about it.

Did you use the wing design application for your simulation ? My problem with that tool is that I get a symmetrical shape before analysis:

http://www.geohei.lu/olin/data/model...18F%20stab.jpg

Also when doing an analysis in the wing application, I get no results due to points computed outside of the flight envelope ( 3D panel analysis shown here ):

http://www.geohei.lu/olin/data/model...simulation.jpg

I though that I could not get results beecause the shape of the stab was non consistent with the limitations of the LLT computation. However you managed to do it.
I am using XFLR5 v4.17. Any suggestion ?

RE: FEJ 1/5,5 scale stabilator help required
 

Olivier, if you discount 10% of the span at the tip to allow for vortices (probably not enough, given the low AR of the stab, but then the sweep will bias the tip a bit stronger), you get MAC at 199mm from the root LE. I wouldn't have the pivot any further aft of this point.

RE: FEJ 1/5,5 scale stabilator help required
 

Olnico,

What type of analysis are you doing on your wing configuration? The "Cl out of range" error seems to point to insufficient airfoil data at the prescribed Reynolds numbers. Are you performing fixed lift computations?

-Matt

RE: FEJ 1/5,5 scale stabilator help required
 

Hi Matt,

Yes, LLT computation.
The airfoil is the NACA0006.
Here is the wing definition data:

http://www.geohei.lu/olin/data/model...definition.jpg

Could you try it from your computer with your version of the soft ?

Thank you so much.

Oli.

RE: FEJ 1/5,5 scale stabilator help required
 

Thanks Stu,

Yes this is what I am doing for hand computations, which I always do before conducting a simulation.

We've rent a flat in Manly next month after Easter. Would you be around for a drink ?

RE: FEJ 1/5,5 scale stabilator help required
 

Absolutely! Please give me a call when you're in town.

RE: FEJ 1/5,5 scale stabilator help required
 

I will. See you...

RE: FEJ 1/5,5 scale stabilator help required
 

g'day oli, thanks for all the detailed posts you spend so much time putting together, always very interesting and educational. this post is to let you know that one of the biggest jet meets in australia is on 16, 17, 18 april, just down the road from manly (about 650 km) or not far from melbourne. here is a link, just post again here if timing might be ok for you and we can talk about getting you in a car, only a 7 hr drive
cheers jeff
http://www.vjaa.org.au/vjaa/sitedocument.aspx?docId=398

RE: FEJ 1/5,5 scale stabilator help required
 

Hi Jeff,
That is a very nice invitation but it is really too far for me. I'm going to Australia to spend some quality time with my wife and kids.
So going away to a jet meeting for a couple of days would not really be welcome here.

Thank you anyway for letting me know and for the kind attention.

RE: FEJ 1/5,5 scale stabilator help required
 

OLNICO THIS IS A KICKASS THREAD...DOES AWAY WITH ALL THE CACKLING AND GOES FOR THE JUGULAR.THIS IS WHAT WE ALL NEED TO SEE HEAR AND LEARN.THANK YOU.

RE: FEJ 1/5,5 scale stabilator help required
 

OK guys,

Here is the complete simulation in XFLR5 generated with the Vortex Lattice Method.

The position of the center of pressure is shown on the lower right corner ( XCP ).

This one is taken at 15 m/s or 30 Kts, which is pretty much the approach speed for this bird. The deflection goes =-15 degrees, which is what can be used in this configuration.

http://www.geohei.lu/olin/data/model...03D%2015ms.avi


This one is taken at 70 m/s or 140 Kts, which is a pretty good cruising speed. The deflection goes =-15 degrees, which is what can be used in hard maneuvers:

http://www.geohei.lu/olin/data/model...03D%2070ms.avi

In green color you have the representation of the lift pressure feild ( lift distribution ), in magenta color, the representation of the velocity drag field.
The fields are scaled by 1/3rd at 140 kts.

The simulation is of course a simulation. It does not take into consideration the fuselage and wing vortices interaction. However it is a good representation of the stabilator regimes in laminar conditions.