Ventral fairing for an aircraft

1. A ventral fairing for an aircraft locatable between a left wing with a left lower surface and a right wing of the aircraft with a right lower surface, the ventral fairing comprising:

a lower central section of convex transverse cross-section locatable between said left lower surface and said right lower surface;

an angle of less than 90 degrees between the cross-section of the fairing and the line of cross-section corresponding to the lower surface of each wing;

a left lateral section of concave transverse cross-section which is extended between at least part of said left lower surface and said central section, and a right lateral section of concave transverse cross-section which is extended between at least part of said right lower surface and said central section;

separate first lines of inflection between the lower surface of each wing and the corresponding lateral section;

separate second lines of inflection between the lateral sections and the central section;

a forward part in which are arranged said left and right lateral sections and the first lines of inflection;

a rear part of convex transverse cross-section which does not include said left and right lateral sections nor the first lines of inflection; and

separate transition sections in which the configuration of the transverse cross-section of the forward part is progressively adapted to the configuration of the transverse cross-section of the rear part.

2. The ventral fairing according to claim 1 , wherein the angle between the cross-section of the fairing and the line of cross-section corresponding to the lower surface of each wing is from 10° to 45°.

3. The ventral fairing according to claim 1 , wherein the angle between the cross-section of the fairing and the line of cross-section corresponding to the lower surface of each wing is from 10° to 30°.

4. The ventral fairing according to claim 1 , wherein the angle between the cross-section of the fairing and the line of cross-section corresponding to the lower surface of each wing is from 10° to 15°.

5. The ventral fairing arrangement according to claim 1 ,

wherein the separate transition sections progressively reduce the left lateral concave cross-section and the right lateral concave cross-section in size in a direction away from said forward part toward said rear part such that the left lateral concave transverse cross-section and the right lateral concave transverse cross-section are eliminated at said rear part.

6. A ventral fairing arrangement comprising:

a left wing having a left lower surface;

a right wing having a right lower surface; and

a ventral fairing having

a central convex transverse cross-section located between the left lower surface and the right lower surface,

a left lateral concave transverse cross-section located between at least part of the left lower surface and the central convex transverse cross-section, and

a right lateral concave transverse cross-section which is located between at least part of the right lower surface and the central convex transverse cross-section,

wherein the angle between the ventral fairing and the left lower surface is less than 90° and the angle between the ventral fairing and the right lower surface is less than 90°,

wherein a first left point of inflection is formed between the left lower surface and the left lateral concave transverse cross-section and a first right point of inflection is formed between the right lower surface and the right lateral concave transverse cross-section,

wherein a second left point of inflection is formed between the left lateral concave transverse cross-section and the central convex transverse cross-section and a second right point of inflection is formed between the right lateral concave transverse cross-section and the central convex transverse cross-section,

wherein the ventral fairing further has a forward section, and a rear section, and

wherein the left lateral concave cross-section and the right lateral concave cross-section are progressively reduced in size in a direction away from the forward section toward the rear section such that the left lateral concave transverse cross-section and the right lateral concave transverse cross-section are eliminated at the rear section.

7. A ventral fairing for use attached between a left lower wing surface and a right lower wing surface, the ventral fairing having:

a central convex transverse cross-section;

a left lateral concave transverse cross-section; and

a right lateral concave transverse cross-section,

wherein the left lateral concave transverse cross-section is configured such that, when the ventral fairing is attached between the left lower wing surface and the right lower wing surface, an angle of less than 90° is formed between the ventral fairing and the left lower wing surface,

wherein the right lateral concave transverse cross-section is configured such that, when the ventral fairing is attached between the left lower wing surface and the right lower wing surface, an angle of less than 90° is formed between the ventral fairing and the right lower wing surface,

wherein the left lateral concave transverse cross-section is configured such that, when the ventral fairing is attached between the left lower wing surface and the right lower wing surface, a first left point of inflection is formed between the left lower wing surface and the left lateral concave transverse cross-section,

wherein the right lateral concave transverse cross-section is configured such that, when the ventral fairing is attached between the left lower wing surface and the right lower wing surface, a first right point of inflection is formed between the right lower wing surface and the right lateral concave transverse cross-section,

wherein a second left point of inflection is formed between the left lateral concave transverse cross-section and the central convex transverse cross-section and a second right point of inflection is formed between the right lateral concave transverse cross-section and the central convex transverse cross-section,

wherein the ventral fairing further has a forward section, and a rear section, and

wherein the left lateral concave cross-section and the right lateral concave cross-section are progressively reduced in size in a direction away from the forward section toward the rear section such that the left lateral concave transverse cross-section and the right lateral concave transverse cross-section are eliminated at the rear section.