Hi Kevin,

> I've created the surface from the curves and as expected
> it has warped, buckled and twisted into all sort of unsual
> shapes.
> However the nose part of the aircraft is looking pretty good so far.

Yup, as we previously discussed if you try to make cross sections go through big changes, like pull an elongated piece out from a single surface construction, it will tend to be much harder to control and generate things like that.

So I would recommend not doing that since it causes problems.

Notice how the front part is formed nicely where the cross-sections are not going through any major changes in shape? Keep that system going towards the back, focusing just on making a smooth tube shape and do not attempt to build the protruding tail fin out as part of the same single surface construction.

Instead, get a smooth body piece built first, then build that tail fin as a totally separate construction, then they can be blended or filleted together.

- Michael