Control Surfaces on Closed wing Aircraft

[Ben Anton]

Hello community,

I am currently working on a concept for a closed wing that has two control surface groups, one at the bottom wing (flaps and ailerons) and one at the top wing (elevator).

However, in analysis when deflecting the flaps, it seems that the hinge axis is in between both wing portions. As a result the flap is moved quite far up, away from the bottom wing and is not attached anymore.

Does someone of you have same experiences and maybe even a solution?

Best regards,

Ben

[Rob McDonald]

Can you post your model -- or some images of this happening?

Rob

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[b.dan...@gmail.com]

Hey Rob, 

i am actually working on the same project. I have attatched an image for you. We can recrate the same problem with regards to the rear control surfaces. After deleting the currupted control surface an recreating it the other one gets bugged.

Best regards 

Ben

Am Montag, 1. April 2019 16:10:11 UTC+2 schrieb Rob McDonald:

Can you post your model -- or some images of this happening?

Rob

On Mon, Apr 1, 2019 at 6:28 AM Ben Anton <h...@online.de> wrote:

Hello community,

I am currently working on a concept for a closed wing that has two control surface groups, one at the bottom wing (flaps and ailerons) and one at the top wing (elevator).

However, in analysis when deflecting the flaps, it seems that the hinge axis is in between both wing portions. As a result the flap is moved quite far up, away from the bottom wing and is not attached anymore.

Does someone of you have same experiences and maybe even a solution?

Best regards,

Ben

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To unsubscribe from this group and stop receiving emails from it, send an email to ope...@googlegroups.com.

[corp...@gmail.com]

Hi,

I tried to replicate something similar. Is this what did you mean ? 

Lower wing with flaps and ailerons , upper wing with elevator.. All deflection angles exagerated for better view.

In this case all surfaces are hinged  and deflected in the appropriate direction.

Corrado

[b.dan...@gmail.com]

Hey Corrado,

this looks great, but how did you do it? 

I experimented a little bit myself, and got the same result on a generic wing with two pairs of control surfaces. (In fact i purposely put some degrees of dihedral on the wingtips to get the hinge lines crossed over)

Greetings

Ben

[corp...@gmail.com]

Here is the model, so you can have a look at it. 

Corrado

[b.dan...@gmail.com]

So you used two wings instead of one, which is a great idear and seems to do the job. Tanks a lot :-) Are there other implications if we do that, for example for VSPAERO? How is the wing-wing intersection modeled in a different way than the same spot on a continuus wing?

Just one sour note is left. It seem impossible to have control surfaces with different hinge lines on the same wing, right?  

Anyway thanks for your help. Best regards,

Ben

[corp...@gmail.com]

Concerning non aligned hinges not working,  I don't know if it is a limit of OpenVSP or there is a way to run VSPAero with those kind of configuration.

OpenVSP team can probably tell us.

Corrado

[corp...@gmail.com]

Just as a test, if the geometry is simple enough in order to manipulate it, you can build a wing as many different wings component joined at their ends. Then for each wing define the relative control surface, each one with its own hinge position.

VSPaero seems to work without any problem, except that curves plots show the discontinuity where wings are connected.

Corrado