With Sweep 2 rails and half parts but I have not the Marco's result (any lines resulting) :)
You can also take Rail 1 as profil and profil as Rail 1 ;)

@ Danny and Marco

Thanks guys. The result is not exactly what I want to achieve which is a nice smooth transition from leading to trailing edge but its probably about as good as I'll get and have to accept it I think. I have tried so many other combinations without success. Thanks also for pointing out the flaw in my curves.

@Frenchy thanks.

You have some good sweeping ideas there but network seems to give a better result without the lines resulting.

I appreciate you guys taking the time to help out. Cheers.

Hi Kevin,
Small tip, the surface will be as good as the underlying curves driving it. the better the curves are developed and the more accurate, the better the surface will be.

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Thanks Danny, that is really good advice and could well be part of the reason why I'm having problems getting a good surface and mesh from the wingtip. I think I'll rebuild those wingtip curves from scratch before applying the final surface.

This is the wing of a Bf109-F (WWII aircraft)

I thought I would post this problem here. I cannot create a wingtip that gives a smooth transition from the leading to trailing edge of the wing. Using the technique I've used (2 rail sweep and the scaling rail). It gives a bulged crimped wingtip.

As I suggested in another thread, perhaps if MoI had the ability of tweaking surfaces with point editing I could then tweak this wingtip to the correct shape as it is almost what I want.

Perhaps there is another way of approaching the modelling of the wing and wingtip so it gives the correct result, I am open to any suggestions help or advice ?