Help with loft

[nstiesi]

After many evenings of furious modeling, I finally got a lofted airfoil that I am happy with.  I bascally built this model from a pdf scan of a blueprint.  I used the print and its descriptions of different sections and outline to plot enough points, create lines and splines between them, and finally a multisection loft with guide rails.

However, I am stuck on the very tip.  The last section transitions to the very edge of the wing, which I have decided to approximate as a rectangular section.  However, the section is not planar; it follows the curve of the wing tip from leading edge to trailing edge.

I cannot loft to the curved flat.  I tried to use boundary patches but I had the same problem that I had when I first tried to use boundary patch to create the entire wing: The result is segmented and the edges between the patches are not smooth.

I am so close to finishing this project.....how can I smoothly model the tip as shown below.  Thank you!

[JDMather]

Attach *.ipt file here.

[nstiesi]

.IPT file attached

[mrattray]

Please, let us know what version of Inventor you are using in the future. It will save us who are not running the latest version from wasting time and bandwidth downloading a file we can't open.
For others: this is a 2014 file.

[nstiesi]

Yes, apologies.  It is indeed an Inventor 2014 part.  I use 2013 at work, but this project is on my own time, so I downloaded a 30 day trial of 2014 on my home pc not thinking about forward compatibility issues.

[JDMather]

Something like this (you didn't bother to dimension anything, so I didn't bother to try to exactly match yours).

[nstiesi]

First of all, thank you very much for the assistance.  I had only today read about lofting to a point and didnt know it could be helpful in this situation.

As is, it looks like a perfectly acceptable solution, though I won't be able to implement it into my design until tonight.

I didnt bother to dimension anything yet as I was still exploring the methodology in doing this design in CAD.  Too many constraints actually made tweaking more difficult.  All of the points comprising my design were laid out on a scaled photo of blue prints, and it was helpful to be able to push and pull the vertices at will to help smooth out the shape.  Once I have everything finalized I will go back and lock it all down so I can export to a CNC.

My next question is, with this method would I still be able to use guide curves to further refine the shape?  In the versions you posted, I noticed that the wireframe was gone, so I am curious how the loft to a point still managed to follow the inteded shape of the wing for the most part. 

[nstiesi]

Well, unfortunately when lofting to a point was performed with my guide rails as shown in the picture above, the loft failed.  I could get it to work if I didnt choose the tangent condition on the point, but then the wing tip had a strange pinch in it.

Is there not way to simply fill in the wireframe as pictured....only smoothly?  Is loft the wrong operation for this model?