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Old May 05, 2013, 02:54 PM
Whisper Model Aircraft
heliwill10's Avatar
Greensburg, PA
Joined Feb 2008
566 Posts
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Xflr and gap TE

I've bugged Tom enough.... Now, it's time to bug you guys!

So, I want to gap the training edge of my airfoil .02"

I see the gap function, but I don't understand what % cord to use.

Also, when I export the dat files and change the cord how is that going to scale correctly?

Thanks,

Will
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Old May 05, 2013, 08:58 PM
Father of Fr3aK, DLG Pilot
tom43004's Avatar
USA, OH, Worthington
Joined May 2002
6,775 Posts
I've just been out of pocket Will. I replaced the heat pump / AC in my house and shop this weekend.

I always set the TE thickness in XFLR to be 1 / chord*.3mm (.011") for DLGs. It could probably be a bit thicker for TD stuff.

The thought is that you want all of your stations to scale up to a .3mm TE thickness. If you have a 200mm chord for example, you would have a TE thickness of 1/200*.3 in XFLR. When you import it to Rhino it will be dimensionless as a point cloud and the airfoil will be 1mm long. Scaling it times 200 to make the chord correct will scale the TE to exactly .3mm.

Clear enough? I know I shared the equation before but I didn't explain it fully.
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Old May 06, 2013, 07:20 AM
Whisper Model Aircraft
heliwill10's Avatar
Greensburg, PA
Joined Feb 2008
566 Posts
Yup, got it!

So, the calculation is entered into the "gap TE" do you use a 100% cord?
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Old May 06, 2013, 02:44 PM
Whisper Model Aircraft
heliwill10's Avatar
Greensburg, PA
Joined Feb 2008
566 Posts
Ok, for the follow up on XFLR and TE Gap.

The math needs to be as follows.

Desired T.E. Gap/ Wing Cord * 100

I used the default blending distance

Will
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