OS 1.60 performance
I just tached my OS 1.60 with various props:
APC 17x6 = 10,000 rpm
APC 17x8 = 9,300 rpm
APC 18x6W = 9,100 rpm
Powerpoint 18x6 = 8,000 rpm
The APC 18x6W gave the best overall performance with my Creek Staudacher: hover, knife edge loop, and slow landing. I'd image the OS 1.60 will fly the Katana very well with the APC 18x6W, and Katana should hover better than the Staudacher due to better control authority in all 3 axes.