Four-vertical-fin empennage structure of ship-based transportation type airplane

Abstract

The invention belongs to a design technology of an airplane empennages and relates to an improvement of a four-vertical-fin empennage structure of a ship-based transportation type airplane. The four-vertical-fin empennage structure is characterized in that vertical distances from front end points of a right inner vertical fin (3) and a left inner vertical fin (4) to a 1 / 4 average pneumatic sine of an airplane empennage are respectively L3; the vertical rubbing amount value is obtained by the formula which is deltaL2=L1-L3; the absolute value of the deltaL2 is not less than 25% of the average pneumatic sine length value of the right inner vertical fin (3) or the left inner vertical fin (4). According to the four-vertical-fin empennage structure, four vertical fins are prevented from stalling at the same time under non-typical conditions of large crosswind carrier-landing launching on the sea, low-speed high-incidence landing on the sea, unilateral failure of an engine, and the like; a disastrous result is prevented and the flight safety is guaranteed.

Description

technical field [0001] The invention belongs to the aircraft empennage design technology, and relates to the improvement of the vertical empennage structure of carrier-borne transport aircraft. Background technique [0002] The structure of the four vertical tail tails of a current carrier-based transport aircraft can be found in figure 1 , it consists of right outer vertical tail 1, right horizontal tail 2, right inner vertical tail 3, left inner vertical tail 4, left horizontal tail 5, and left outer vertical tail 6. The right outer vertical tail 1 is fixed on the outer end surface of the right horizontal tail 3, the left outer vertical tail 6 is fixed on the outer end surface of the left horizontal tail 5, the right horizontal tail 3 and the left horizontal tail 5 are installed on the fuselage rear section 7, and the right inner vertical tail The root of 3 is fixed on the upper surface of right horizontal tail 2, and the root of left inner vertical tail 4 is fixed on the...

AI Technical Summary

Problems solved by technology

Its disadvantages are: carrier-based transport aircraft often have to face strong crosswind landing and take-off at sea, landing at sea at low speed and high angle of attack, and large engine yaw moment when one side of the engine fails. Under the circumstances, multiple vertical tails are required to have high heading stability and high control efficiency. The traditional method is to solve the problem by increasing the number of vertical tails and / or increasing the area of ​​vertical tails.

However, increasing the number of vertical tails without limit and increasing the vertical tail area may not necessarily improve the directional stability and handling problems of the aircraft in proportion, but will bring too much structural weight and affect the aircraft's use efficiency.

For example, the vertical fins of an existing carrier-based transport aircraft have relatively small friction in the longitudinal positions of the multiple vertical fins, and the leading edge sweep angles of the inner and outer vertical fins are basically the same. Under the above-mentioned atypical flight conditions, the Stall of the vertical tail, which can occur on all 4 vertical tails at the same time, often with disastrous consequences

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