Originally Posted by barit1
What free energy are you talking about?
I think MF's example has the 747 sat on its tail with the engines pointing vertically downwards. Gravity is not overcome, yet in flight gravity is overcome but without any increase in engine power. I can see what he's getting at.
I find learning Bernouli et al to be somewhat like
having to learn creationalism knowing that it'll be on the test.
My Trevor Thom book says:
"Moving the left rudder pedal forward deflects the rudder to the left. This increases the speed of airflow on the right hand side of the fin, reducing the static pressure there and creating an aerodynamic force to the right."
Argh!
Pretty much the same theory is applied to the elevator in that tome.
Problem is. Why do we then have all moving tails? Why would the airspeed increase below the tail because of decreased AoA? (up elevator)
Also, I can make a flat plate wing fly on a model aircraft and near enough on full size (Lightning springs to mind). All about the angle of attack and deflection of air then surely.
Logically when you apply up elevator on an 'all moving tail' then the aircraft will rotate from the leverage of the deflection force until the tail datum realigns with the airstream. Since the plane is now following a curve the airflow direction (relatively) will keep changing and so the aircraft will continue to rotate so long as the stab is misaligned and therefore creating the deflection
