Lofting multiple shapes

[ljbdeshler]

Hello.  I have a ?complex? loft I started drawing to make a space vessel.  I think I have the profiles as simple as I can make them but when I loft, I get a "river" that flows through the model and makes thing more difficult later after I thicken and start cutting out hatches etc...   I am looking for advice or a very detailed definition of the lofting function.  The YT vids all have what I think are simple examples of lofting and nothing as complex as what I am trying.  I prefer to loft in surface mode and then thicken as I like to 3D print only the shell with 2mm thickness.  Thanks.

[jeff_strater]

I'm not sure I understand what you are referring to as "a river".  This loft looks quite reasonable to me.  You will probably have to share your model to get detailed help.

[ljbdeshler]

If that is reasonable then I can work with it.  The "river" I refer to are the 2 black lines running down the middle of the model and it seems to create 3 separate surfaces when I click on each area.  Maybe that's the best I can do.

[davebYYPCU]

Too many sketches, too many spline points. 

Give Fusion a fighting chance, with equal number of spline points in each rail? sketch.

Use dummy surfaces and set up tangency as you go.

Visual display set to Shaded.

Might help....

[TrippyLighting]

That loft does not look reasonable to me. That is entirely a result of the loft inputs!

The two additional internal edges should not have been created in such a relatively simple shape.

As @davebYYPCU has already stated, too many spline control points and too many loft profiles.

More data does not create a more precise loft!

Where reasonable, I work with single span control point splines, not with fit-point splines.

Single span means that a 3-degree control point spline has 4 control points, a 5-degree control point spline has 6 control points.

[ljbdeshler]

Wow!  Thank you, that is much simpler Than what I was attempting.  I will try to use that method with the canvases I have and see how it goes.  I'll report back here.  Always learning...

[ljbdeshler]

Thanks for the file to look at !

[ljbdeshler]

Thank you all!  I got a much better results using the technique above by daveb.  Luke