Earlier in the thread, some of you were talking about "P" factor, or the existance of a critical engine on tubofan engines, and I would like to point out that this is no-existant (for practical purposes anyway) due to the air being directed through the nose cowl. Of course, some things will affect airflow at slower speeds (strong crosswind, or high reverse power at slow speeds, for ex.), but there is no differance in power output due to the pitch attitude of the aircaft as the air that is going through the C1 disk is being "straightened" by the nose cowling. Hope this is more helpful than confusing. Some of the bigger engines have 34-48 blades on the C1 compressor, and it would be nearly impossible to build a hub that would withstand the forces imposed on it and accomodate this number of blades.