It was later realized that the drag could be reduced much more by lengthening the hump, using it to reduce wave drag offsetting the tail surface's contribution.
42.
Most of the drag an aircraft sees while speeding up to supersonic speeds occurs just below the speed of sound, due to an aerodynamic effect known as wave drag.
43.
From a technical perspective, at hull speed the bow and stern waves interfere constructively, creating relatively large waves, and thus a relatively large value of wave drag.
44.
Wave drag is independent of viscous effects, and tends to present itself as a sudden and dramatic increase in drag as the vehicle increases speed to the Critical Mach number.
45.
One common solution to the problem of wave drag was to use a swept wing, which had actually been developed before World War II and used on some German wartime designs.
46.
But even with these sorts of measures at some point the forward speed of the plane combined with the rotational speed of the propeller will once again result in wave drag problems.
47.
At the subsonic airspeeds where the " U " shape of this curve is significant, wave drag has not yet become a factor, and so it is not shown in the curve.
48.
For high speed applications near or above the speed of sound, a Sears-Haack body, is an idealized shape that minimizes wave drag, which is the drag associated with supersonic shock waves.
49.
When an aircraft flies faster than about Mach 0.8 ( depending on design specifics ), the airflow around some parts of the aircraft already reaches the speed of sound, increasing wave drag.
50.
In addition, the speeds put them into the wave drag regime, and anything that could reduce this drag would increase the performance of their aircraft, notably the notoriously short flight times measured in minutes.
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