Ok guys. Thanks for the replies. Although I don't quite follow all of your acronyms.

First, this is for a full size airplane, not a model.

I follow Henry's answer, but think that some of it is a bit 'tongue-in-cheek'. I'm not looking to do a gazillion discrete points. I just want to define those for the fuselage former locations, then loft the shape accordingly.

In principle, I can define the basic fuselage shape with 4 seperate mathematical equations (former shape based on the width and height above/below centerline, the upper fuselage profile, lower fuselage profile and the width). So for every location 'x' along the centerline from nose to tail, I can calculate the upper, lower profiles and the width. From those, you get the former shape. Then generate a loft / Bezier curve to fit these points.

Seems simple enough.

MarkS- what do you refer to with "SU" and "API". Must admit, I'm pretty new at this CAD stuff, even though I've been drawing with pen/paper for longer than I care to acknowledge. I don't have the SDK for my version, or at least, am not aware of it (have v14 Pro Platinum Edition, with the 14.2 patch). The polynomial equation is readily obtained through the excel plot routine. This makes it easy to do the loft / straighten the points. I'm not that much of a math whiz. However, I find it easier to determine a mathematical model which applies to all areas than using the TLAR approach in (hopefully) getting a good spline fit. The shape has to go through certain points, while others can be smoothed. Maybe I'll have to try another tack and work directly in TC using the width / height data. Would be easier to "read-in" half a-gazillion points though.

Don- will check out the CadCourse pages and start looking for MAPLE. Maybe that will help. I have a copy of Freeship!, which is a DelftShip relative. I've been drawing / designing boats with it for a while now. I just find exporting the data to TC to be a pain and am not able to accurately draw the resulting shape in TC with sufficient accuracy. Probably a learning curve (or lack of it) thing.

extra230- I need to get quite a bit closer than TLAR, I'm afraid.

Is there an application available (3rd party etc.) that would read in excel data (i.e.- in batch form) for the x,y and/or x,y,z points? If so, one should be able to loft from those, no?

Thanks again,

Matt