ORIGINAL: tripower222
>Now tell me why that will not work with facts. Not by just saying or quoting internet to say the tail supposed to push down. Of course it is in some cases and in those cases, now the airfoil will allow it to push down less keeping the airplane level.</span>
People are quoting textbooks. You are not taking into account that our conventional designs are set up for static stability. Stability tells us (both in theory and practical) where the cg needs to be. So we do that. That drives what kind of trim (elevator force) is needed for steady state flight at a given speed. So we trim for that. Now we fly faster and the plane climbs. So we change the trim. At no time will the force required from the stab point up. Less "down" but not "up." Your flatbottomed stab (wasn't that a Queen song?) would be more efficient mounted upside down, with the flat side on the top. Disclaimer: Aerobatics, unstable configerations (aft cgs), canards, etc.
Kurt