Method for improving the performance of an aircraft
View Patent ↗Disclosed is a method for improving the performance of transport aircraft. In particular, the aircraft is provided with a rounded nose cone in front of a center of gravity of the aircraft. The rounded nose cone has an upper longitudinal surface and a lower longitudinal surface configured, respectively, to generate a lifting force and a negative lifting force and produce a resultant that is lifting and to produce an auxiliary nose-up moment. The method involves shaping the nose cone to increase the lifting resultant. This shaping is carried out-by increasing the upper longitudinal surface of the nose cone, so as to increase the lifting force, and by reducing the lower longitudinal surface of the nose cone, so as to decrease the negative lifting force.
1. A method for improving the performance of transport aircraft, said transport aircraft comprising:
an airfoil configured to generate a lift producing a nose-down moment for said aircraft;
a horizontal tail plane configured to generate a negative lift producing a balancing nose-up moment for said aircraft; and
a fuselage with annular cross section and provided with a nose cone, wherein the nose cone is disposed in front of a center of gravity of said aircraft, terminates towards a front end in a rounded nose, and has an upper longitudinal surface and a lower longitudinal surface configured, respectively, to generate a lifting force and a negative lifting force and produce a resultant which is lifting and produce an auxiliary nose-up moment,
wherein, the method comprises the steps of:
shaping the nose cone to increase said lifting resultant:
by increasing said upper longitudinal surface of said nose cone, so as to increase said lifting force;
and by reducing said lower longitudinal surface of said nose cone, so as to decrease said negative lifting force.
2. The method as claimed in claim 1 ,
wherein, to increase said lifting force, the curvature of said upper longitudinal surface is optimized so as to increase the flow speed of the air stream on the latter surface.
3. The method as claimed in claim 1 ,
wherein, to decrease said negative lifting force, the curvature of said lower longitudinal surface is optimized so as to reduce the flow speed of the air stream on the latter surface.
4. The method as claimed in claim 1 ,
wherein, to increase said lifting resultant, said nose of said nose cone is displaced vertically upwards.
5. An aircraft,
wherein the method of claim 1 is implemented.