I have a 40 size gp extra that has an os 46ax I have a 10x6 propon . I am going to put a 11x6 on . What will this do as far as fling power.

The OS46AX's recommended prop is an 11x6.

Changing from a 10x6 to the recommended prop ought to give you better performance. It'll probably pull the airplane faster and with the extra fan area, should climb better.

That engine should work well with an 11x5 or 11x6. You'll probably like it better than the 10x6.

Try A APC Porp Of The Same Size.i Like Them Better Because They Do Not Flex As Much.On The Bad Side They Are Not As Forgiving In A Crash.I Still Like Them I Just Learned To Crash Well