RE: o.s. 120AX "Break in prop"
Sawannichani, sorry for the harsh response, but the comments by Jeremiah made my “snap”. I’m really a nice guy.[sm=49_49.gif] A 17X6 prop will be fine for this engine. I know it’s not one of the props listed in the booklet but the 17X6 is only slightly less load that the 16X8, about the same as a 15X10, which is listed. If you do not want to purchase the 16X8 you could use the 17X6 to run-in your engine. The 120AX should turn this prop 9200+after it's broken-in . I hope this helps