Re: Poor filing practice?
The overal rocket design was very much a german/von Braun design. The F-1 engine was much more "american" and based more on what they could reliably produced at that size and output power. I'm sure there were reasons to go for an old fashioned brazed tube design over a double walled one. For one thing because, due to lack of modern FEM analysis and limited manual calculating capacity, most of the thermal design on double walled combustion chambers was "try it out and see if it melts", which wouldn't really do on an engine the size of the F-1. A brazed tube design was easier to perform the calculations on.
Biting the hand that feeds IT
