Hi Simba, to use Blend you would first prepare the surfaces by making open holes - use Trim on the body part and delete the bottom end cap so that those edges are open. When you have edges that are joined between 2 surfaces it is unpredictable which of the 2 surfaces the blend will target to match up with, so that's why you want to prepare the edges to not be joined before blending.
Then there's a brand new "Planar sections" option in the most recent v3 beta release which can help with this particular kind of blending situations, see this post for some information on the new option:
http://moi3d.com/forum/index.php?webtag=MOI&msg=6790.35
http://moi3d.com/forum/index.php?webtag=MOI&msg=6790.33
I've attached a model file with a result of using a "Planar sections" blend for your case, on the left you can see the prepared openings, and then the right has the blend done using the "Planar sections" option, with the up direction in the z axis direction:
I think you may sometimes run into problems with a totally sharp trailing edge on the wing part though, I seem to remember that in some cases the blend can get confused about which side of the surface it is supposed to be connecting to in cases like that. I can't quite remember if that's been addressed totally or not yet. If you run into problems where it looks like the shape suddenly shifts right at a sharp end like that you may need to instead have a small amount of rounding in those areas. EDIT: Ok, actually this should not be an issue when the wing is split into 2 half pieces like you have here - that should avoid this particular problem. The problem would potentially happen when you had the wing as just one single surface that folded around and touched itself at a sharp cusp like sharp area.
- Michael
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