Thanks for your response Frank, I had suspected as much, I liked this special method and enjoy building so I had considered it briefly. However, I think that you are correct, internal foam, current methods, is just one less step and perhaps still the way to go. The Lost Foam Method was popular for CL as the designs were so weight critical till larger engines became more popular. I just needed a little confirmation from someone longer in the pattern busienss to decide if I shuld design this into a plane I'm working up.

I will not use the Lost Foam method but our regular foam core setup or even a traditional built up wing like I have always done.

Cheers

Bruce