RU2515817C2 - Canard-2 control (versions) - Google Patents

Abstract

FIELD: aircraft engineering.

SUBSTANCE: mechanical version of all-moving feathering front horizontal canard incorporates controlled brake or thrust/thrusts in drive kinematics. Hydraulic version has stopcock in canard hydraulic control system to shutoff hydraulic fluid feed. Electric version uses the switch in electric remote control system.

EFFECT: better pitch control.

7 cl, 1 dwg

Description

The invention relates to the control of elevators of flight or combat aircraft and other aircraft with aerodynamic rudders.

Known control aircraft "Management" duck "(options)", see US Pat. No. 2410286, which provides for weathervane control of a fully rotatable PGO (front horizontal tail), including regressive. This control allows you to get better pitch maneuverability than conventional control, and the regression version has increased longitudinal stability. However, even better maneuverability is possible.

Let me remind you, the prototype has three options: hydraulic, electro-remote and mechanical (manual).

The objective and technical result of the invention is to obtain increased pitch maneuverability.

To do this, this mechanical control has a controlled brake or an emphasis / stops in the kinematics of the drive PGO. The brake (i.e., the fixed coupling) can be friction, gear, spline, etc.

This allows the pilot to command a sharp increase in pitch at the time of lifting the nose of the aircraft (all directions are given relative to the direction of horizontal flight) to fix the PGO in this position at about +5 to -30 degrees. This will lead to a decrease in longitudinal stability, and with appropriate alignment, to a loss of longitudinal stability, which will allow to perform aerobatics of the “cobra” type. At the moment of negative angle of attack (pitch more than 90 degrees), the brake or stop is released. And the plane acquires the initial longitudinal stability and goes back to horizontal flight. In this case, it is desirable to boost engine power, for example, by supplying nitrous oxide.

When performing the “cobra”, the PGO goes into a negative deflection angle (down), therefore, instead of a sleeve that allows you to fix the PGO in any position, there is enough emphasis / stops. The emphasis is enough one - only in the downward direction from -5 to -30 degrees. Moreover, the emphasis is preferably performed in the form of a latch, self-opening in the upward direction. This will protect the plane and the pilot in case of failure of the focus control - in case of failure of this control, the PGO from the “large negative pitch” position will slip the latch and will return to the neutral position. For the same reason, it is better to use a friction brake than a toothed or spline brake.

On the mechanical version of such control, a very large bending force will act on the vane rod. Therefore, it is desirable, in order not to increase the strength, to have in the kinematics of controlling the wind vane an elastic coupling allowing rotation of the wind vane only upwards. In the variant with the external location of the weather vane (I recall, the weather vane can be located outside the PGO, at the fuselage and separately), it is convenient to use a torsion located inside the hollow shaft of the weathervanes as such a clutch, and there is a limiter on the shaft that allows torsion torsion only in the upward direction.

In the hydraulic version, the same means can be used to fix the PGO, but at the same time, the supply of the hydraulic fluid pressure must be turned off. To do this, in the PGO hydraulic control system there is a crane that shuts off the flow of hydraulic fluid.

In the remote control version, everything is simple - you just need to turn off the power supply to the VGO drive. To do this, in the system of remote control PGO there is a switch.

To carry out the “cobra,” the aircraft structure, of course, must be strong enough, and the speed should be low enough (it is recommended to release the flaps to reduce speed).

The attached sketch shows in a simplified manner the stop devices in the form of a latch. On the shaft 1 PGO (shown from the end) there is a tooth 2. Near the shaft there is a lever 3 with a latch 4, a spring-loaded spring 5. The lever itself is also spring-loaded 6. A thrust control rod 7 is attached to the end of the lever.

The emphasis works this way: when performing the “cobra”, the pilot pulls at the thrust 7, and the lever 3 with the latch 4 gets in the way of tooth 2, preventing the PGO to deviate downward, say, by an angle of more than 10 degrees. The plane receives a pitch of more than 90 degrees. The weather vane deviates within the limits of the elastic coupling (its stroke must be at least 180 degrees). At the top point of the “cobra”, the pilot releases thrust 7, and the PGO gets the opportunity to navigate in the flow with the desired angle of attack using a weather vane.

If the spring 6 is broken or if the rod 7 is jammed, the shaft 1 will return to the neutral position by sinking the latch 4.

Claims (7)

1. The control "duck", containing a fully rotated vane front horizontal tail, characterized in that it has a controlled brake or emphasis / stops in the kinematics of the drive of the said feathers. 2. The control according to claim 1, characterized in that the brake is friction, or gear, or spline. 3. The control according to claim 1, characterized in that the emphasis is made in the form of a latch, self-opening in the upward direction. 4. The control according to claim 1, characterized in that in the kinematics of the control of the wind vane there is an elastic coupling allowing rotation of the wind vane only upwards. 5. The control according to claim 4, characterized in that a torsion bar located inside the hollow shaft of the weathervanes is used as an elastic coupling, and there is a limiter on the shaft that allows torsion torsion only in the upward direction. 6. Control "duck", containing a fully rotated vane front horizontal tail unit, characterized in that it has a controlled brake or stop / stops in the kinematics of the drive of the said tail unit, and in the hydraulic control system of the said tail unit there is a valve that shuts off the flow of fluid. 7. Management "duck", containing a fully rotated vane front horizontal plumage, characterized in that in the remote control system of the said plumage has a switch.