Funny surface loft

[mossnd]

Hi guys. 

Im trying to loft a combination of surfaces and then stitch together to create a body.

This is a Junction between a fuselage and wing on a sailplane.

In the attached Pics, you can see the two stages where it goes ok, and then i get pipped at the finish line , where i add a second rail to guide the loft, but it goes a bit saggy.... in a weird way

can anyone help me through this? so close to having a result, but this is odd, i havent had this before.

[davebYYPCU · Accepted solution]

Should not do that.  Are you selecting Sketch curves, body edges, or a combination of both?

Will need the file.

I would expect a top and bottom loft to work, but you have a few more sections than that.

All those face edges would be from too many spline points in the sketches.

Might help....

[mossnd]

In this case used surface edges to create the lofts.

I try not to mix sketches, faces, bodies as selections to create the lofts

Your comment about the face edges is true, however, i usually sketch the airfoil shape off DXF file i import, 

but i find the fit point spline needs many points to fit the original airfoil shape, hence why so many points.

I acknowledge this is the fundamentals of some of my loft problems.

[davebYYPCU]

Try reversing the selections, short edges as profile, and long edges as Rail.

Are you using helper surfaces for tangency?

Might help....

[mossnd]

Yes i try to use the adjacent surfaces for tangency. 

i tried swapping the profiles for rails like you suggested, however initially is failed as the rails werent smooth (enough). 

i went back into my sketches and reduced the number of fit point spline points, and had success after that when trying this loft again 

[mossnd]

The final wing cuff has worked out