Help! foam board swept wing problem

[badpilot27]

I made a flying wing out of foam board and I found that the upper surface would be offset from the lower surface when I fold the wing. I made the wing in a similar way to the method shown in this video. the offset did make it easier to add dihedral but it would also make it harder to add an extension to the wing which is required for larger wings. I'm wondering if anybody can help me improve my construction method so this doesn't happen on future builds.

I just connected the wings together where the lower surfaces meet and used a piece of foam board to connect a part of the upper surfaces together. the tape is there to cover the hole and it makes it easier to adjust the amount of ballast is in the wing.

 

[Tench745]

You'll need to trim the lower surface to match the upper one. If you draw a line along the foam where the leading edge will be, the inboard edge where the top and bottom skins end should be mirrored across the leading edge fold.

 

[badpilot27]

Is there any way to fix this before I fold the wing over?

 

[AIRFORGE]

Is there any way to fix this before I fold the wing over?

That's pretty normal for wing design.
Take a look at this FT build vid for more ideas.
FT Versa Wing BUILD

 

[quorneng]

Is there any way to fix this before I fold the wing over?

Yes but you would have to be really good at geometric calculations.
Just imagine you cut yourself a pair of solid foam wings but you wanted to join them with a sweep of 30 degrees?
You would simply cut the end off each wing carefully at 15 degrees.
No reason why you can't do the same with the end of each folded foam board wing.

 

[badpilot27]

So should I fold the wing over, draw a line where the upper or lower surface starts off setting from the other, unfold the wing and cut along that line, and then fold the wing over and glue it?

 

[Tench745]

So should I fold the wing over, draw a line where the upper or lower surface starts off setting from the other, unfold the wing and cut along that line, and then fold the wing over and glue it?

That should work.

 

[badpilot27]

That should work.

ok, thanks