News Column

Patent Issued for Method for Improving the Aerodynamic Efficiency of the Vertical Tail of an Aircraft

August 6, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- Airbus Operations (SAS) (Toulouse Cedex, FR) has been issued patent number 8783606, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventor is Tanguy, Alain (Toulouse, FR).

This patent was filed on April 4, 2012 and was published online on July 22, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "It is known that the vertical tail of an aircraft is able to generate, as a result of its surface, a lateral lift and an aerodynamic drag, and that the vertical tail should ensure to said aircraft the stability, the maneuverability and the balance for all flight conditions.

"The surface of the vertical tail is dimensioned so as to be able to compensate for the yaw effect created as a result of one of the engines of the aircraft becoming defective, allowing to ensure to the aircraft a sufficiently low minimum control speed in the case of an engine failure so as to meet the take-off and landing performances of the aircraft. The dimensions of this vertical tail are calculated at a low skid state of the aircraft, for a rudder having, with respect to the drift of the vertical tail, a maximum angular position."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "This invention aims at increasing the lateral lift of the vertical tail or at maintaining the same lateral lift while decreasing the surface of the vertical tail. To this end, it provides a method allowing to improve the local aerodynamic efficiency of the vertical tail on the whole height of the vertical tail, that is to bring the local value of the coefficient of lateral lift closer to a maximum allowable value of the coefficient of lateral lift beyond which the air layer is separated from the surface of the vertical tail.

"To this end, according to this invention, the method for improving the aerodynamic efficiency of the vertical tail of an aircraft comprising a rudder able to pivot with respect to said drift, is remarkable in that the thickness of the trailing edge of the rudder is varied as a function of the span of the vertical tail, so as to bring the local value of the coefficient of lateral lift applied to the vertical tail closer to a maximum allowable value.

"Advantageously, the maximum allowable value of the coefficient of lateral lift is the value beyond which, for a given angle between the rudder and the drift, a separation of the aerodynamic flow is observed on the surface of the vertical tail.

"Moreover, the variable thickness is determined, from the trailing edge of the rudder, as a function of the local value of the coefficient of lateral lift, calculated with an angle of the rudder, with respect to the drift, for which a separation is observed of the aerodynamic flow on the surface of the vertical tail.

"Thanks to this invention, and as set forth below, the intrinsic efficiency of the profile is increased, increasing the thickness of the trailing edge of the rudder on the internal part of the vertical tail and decreasing the thickness of the trailing edge on the external part, so as to obtain the desired load law.

"In a first simplified embodiment of the method according to this invention, the thickness of the trailing edge of the rudder is varied as a function of the span of the vertical tail, according to a thickness variation linear law, with a thickness decreasing from the internal end to the external end of the vertical tail.

"In addition, in a second optimized and preferred embodiment of the method according to this invention, the thickness of the trailing edge of the rudder is varied as a function of the span of the vertical tail, with a thickness decreasing from the internal end to the external end of the vertical tail, according to an optimized thickness variation law, allowing to have said local value of the coefficient of lateral lift (substantially) corresponding to said maximum allowable value.

"The present invention also relates to a vertical tail of an aircraft comprising a drift and a rudder able to pivot said drift.

"According to this invention, said vertical tail is remarkable in that said rudder has a variable thickness from the trailing edge following the span of the vertical tail, enabling to bring the local value of the coefficient of lateral lift applied to the vertical tail closer to a maximum allowable value.

"In a first simplified embodiment, the thickness of the trailing edge of the rudder varies as a function of the span of the vertical tail, according to a thickness variation linear law, with a thickness decreasing from the internal end to the external end of the vertical tail.

"In addition, in a second optimized and preferred embodiment, the thickness of the trailing edge of the rudder varies as a function of the span of the vertical tail, with a thickness decreasing from the internal end to the external end of the vertical tail, according to an optimized thickness variation law, allowing to have said local value of the coefficient of lateral lift (substantially) corresponding to said maximum allowable value.

"The present invention further relates to an aircraft, in particular a transport airplane, being provided with a vertical tail such as mentioned hereinabove."

For the URL and additional information on this patent, see: Tanguy, Alain. Method for Improving the Aerodynamic Efficiency of the Vertical Tail of an Aircraft. U.S. Patent Number 8783606, filed April 4, 2012, and published online on July 22, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8783606.PN.&OS=PN/8783606RS=PN/8783606

Keywords for this news article include: Airbus Operations.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Journal of Engineering


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters