@ 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.