**Acronyms and abbreviations**

with increasing the aspect ratio of the rectangular wing and with increasing the ratio of the axes of the cross-section fuselage. The optimal ratio of the width of the

*Maximums of the lift-curve slopes for the optimal midwing configuration with elliptical cross-section body vs.*

*The optimal relative diameter of the fuselage with circular cross-section body for the midwing configuration vs.*

**Figure 19a** shows the effect of the compressibility and the statistics for modern aircraft also (**Figure 19b**). Red color point shows the project of fifth-generation aircraft (project M-60, Russia). The feature of the project M-60 is a wide fuselage. As can be seen from **Figure 19b**, with the aspect ratio wing equal to 15, the optimal ratio of the width of the circular cross section to the wingspan can reach 20%!

The paper presents results obtained by the author for wing-body interference. The lift-curve slopes of the wing-body combinations are considered. A 2D potential

body to the span of the wing can reach 30% and more!

**6. Conclusions**

**92**

**Figure 17.**

*Aerodynamics*

**Figure 18.**

*the aspect ratio of the rectangular wing.*

*the aspect ratio of the rectangular wing.*

*Aerodynamics*
