The problem here is simple. We all know wings have a specific angle of attack where the lifting force becomes zero.
Originally Posted by
Ewfflyer
In this very specific case, no, not until it is deflected against another force. As long as the plane is perfectly vertical, it is the engine doing the work.
Now in the real world, there would be slight control inputs to keep the plane vertical, so yes there would be small forces applied, but not in the normal sense of a plane flying along the horizontal path.
It's just theory, so it can all be taken for what it's worth.
This statement is only true with:
1)a symmetric wing where the chord line is parallel to the horizontal line of the fuselage
2)a wing with a positive camber and the angle of incidence is negative
3)a wing with a negative camber and the angle of incidence is positive
Otherwise the plane cannot be perfectly vertical and fly perfectly vertical.
It' just theory!