Porting is paying pretty big dividends. I'm moving very quickly through the code base, fixing lots of things that were not "right" when done in C because the "compile > reload" was just too cumbersome. I've got about 75% of the code base rewritten in the last 3 days. With the burdern of working in C removed and the added experience of the 737 coding, it is much easier to try new things or rewrite algorithms. I know many won't be too happy, but this update will be V10 only. After a year of working on V10 and it getting reasonably stabilized, there is no reason not too, there is just too many nice features to take advantage of. This is just the way computer software is. The Moo now has "real" landing lights on the wings, real wing ice light...independent taxi light control on the nose, higher fidelity systems simulation etc. Tom