Upside down supersonic flight

> Seems to me, the answer might go something like this. 
>  
> A reverse camber wing for supersonic flight. 
>  
> The wings of a supersonic aircraft needs to have reverse camber, similar in 
> shape to the bullet. On the bottom of the wing, first generating a strong 
> compression shock to increase the pressure, then the entire length of the 
> wing is an expansion fan to bringing the pressure back to atmospheric and 
> the flow back parallel to the velocity vector.  
>  
> The top of the wing is essentially flat, an expansion shock at the leading 
> edge, followed by a long flat or a slight expansion fan surface. The goal 
> being to keep the flow laminar and attached. Maybe even a slight 
> compression fan at the trailing edge to keep the boundary layer from going 
> turbulent.
>  
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>  
> The entire wing/body should be of similar shape, a short but large 
> compression shock followed by a very long expansion fan to dissipate the 
> shock wave used to increase the pressure on the lower side of the 
> wing/body. 
>  
> One implication of this design would be that the lift on the supersonic 
> wing would move froward towards the quarter cord, similar to where the lift 
> on a subsonic wing is. This would be nice in that control of the aircraft 
> would be similar in both subsonic flight and upside down supersonic flight. 
>  
> One of the bad implications would be increased drag because of the larger 
> compression shock at the leading edge of the wing (cosine losses). This 
> could be reduced or kept at a minimum by keeping the wing as thin as 
> possible. 
>  
> If the passengers complain, it might be a good idea to roll them right side 
> up inside the fuselage. And, if that's too much trouble, the aircraft could 
> just be designed for supersonic flight and just leave the subsonic portion 
> inefficient 
> 
> If you think of Bernoulli, the goal of subsonic flight is to decrease the 
> pressure on the upper surface of the airfoil. But, the goal for supersonic 
> flight is the opposite, increase the pressure on the lower surface of the 
> airfoil. This becomes more and more important as the aircraft flys higher 
> and higher, as the pressure can't be decreased past zero.
> 
> Craig Fink

All new airliners like Boeing 777, Airbus 318-340 and military C-17
have a supercritical wing with almost flat upperside!

They have the camber below the wing to be able to carry all fuel
onboard and to house the wingbeam!

The supercritical wing really debunks the theory of Lift due to the
"Bernoulli effect and upper camber"!


Jan-Olov Newborg