ORIGINAL: Ed_Moorman
I must take exception with the remarks about the OS .46AX design. It seems obvious that the author has not compared the design with that of the FX. I am attaching 3 photos so you can see the differences in the cylinder and head design. It is not a rehash of the older FX engine, but a new and different design for OS.
Hi Ed, I'm not sure if by "the author" you were referring to rmenke or myself, but I have had many .46FXs and had the AX. I still have an FX and maintain that I prefer it to the new AX. I saw and acknowledge the design and advantage of the grooved AX head that it may prevent some head leakage as the engine ages. When I ran the AX I appreciated the low RPM torque for swinging large props for 3D type flying with a little more grunt than the FX, though I can think of several better choices for both scale and 3D applications than the .46AX.
My experience has been that the FX was a more versatile engine and I will buy a NIB .46FX over a new .46AX any day of the week.
-Respectfully, Steve