In that case, I'll pose a question or three.

If you have adjusted metering needles on the ground to obtain a specific mixture, what action could change those settings when the prop is spinning in flight? Could those specific metering settings change at all? What does or can change between the prop spinning on the ground and spinning in flight? The "does" and "can" are important and often related to performance. In the specific case presented by the original question, the "does" bears more weight.

Have at it folks, you now have a lot to work with[8D] What makes this such a good question is that it presents itself so often, generally is misunderstood or answered poorly, and now there's a great opportunity for open participation in discussion and arguement. Much will be learned form the final answers, which I truly believe the participating audience will correctly answer. It may take awhile but it will be worth the ride[sm=idea.gif]

No name calling, no "stupid", "dumb", or otherwise negative affectations, and everyone starts even. I know you can do it. The winner will be everyone[sm=thumbup.gif]

Dick, Pe, just sit back and enjoy.