SEMS and EMERGENCY LANDING ACCURACY - Annex

This is an indicative and never limiting application of the two New Physical Laws applications. On an aircraft, whatever be the flight configuration (slats/flaps), for each value of the load, speed and angle of attack there is a unique Elastic Envelope (EE), with its corresponding exact value of bending/torsion for each point of the structure. In the same way, there is a unique exact value of stress/twist for each strain gauge located at each point of the structure. This application is based on increasing the accuracy of the measurement in the structural points, by replacing the structural plate at the point for a flexible strain gauge.Such flexibility will depend on the measurement accuracy we want to get in real time of the lift or speed of the aircraft, relative to its load or weight. The strain gauge’s body may be of the same alloy as the structure, or any other standard material according to criteria. This gauge can be integrated in the structure as structural plates, or else isolated from said structure.It is emphasized that the measure of the elasticity in real time allows us to obtain all the physical variables of the structure. For sample, in the case of the airplane lift, we measure it directly by the elasticity that originates/creates, and not indirectly through the wind or speed as Pitot Tube. In the exact physics, the only way to make an accurate/exact scientifical measurement is from the direct measure of the physical fact.

ELASTIC STRAIN GAUGE sliding BASE

WING-FUSELAGE BOTTOM

SHARKLET

BOTTOM WING

FLEXIBLE ELASTIC strain gauge

MIGUEL CABRAL MARTÍN

WING’S PRESSURE CENTERING

= strain gauges (the direction of the sensors in the wings and stabilizers may vary according axes) (in this application the strain gauges are biaxial)

α

RUNWAYMIGUEL CABRAL MARTIN

Basically, the Elastic Angles of Attack (EAOA) at each point of the structure, correspond to the torsion angles for each wing and stabilizer, and to the bending angles of the fuselage. The real-time resolution of this system of angles and vectors allow us to the precise control of the landing maneuver, placing the aircraft at the exact point at minimum speed or stall.

LANDING ANGLE (AOA)

α

By measuring the whole elasticity (SEMS), we can know in real time the exact tilt or elastic rotation of any structural point, to obtain the exact Resultant Angle of Attack (RAOA) of the aircraft. In other words, the rotation or elastic tilt of the measuring point, will indicates the direction of the flight path vector or thrust vector of the structure at that point.

LANDING APPROACH ANGLE (AOA)

α = Angle of Attack (AOA)

REAL WATER LANDING

α = Resultant Angle of Attack (EAOA)

WATER LANDING`S ACCURACY

water

α

The exact resolution of the elastic angles and vectors system is crucial for the safe water landing, in order to get an accurate contact and sliding of the aircraft on the water. This will be achieved with the precise configuration of the SLATS and FLAPS at the time of the contact.

SAFE WATER LANDING

waterMIGUEL CABRAL MARTÍN

MIGUEL CABRAL MARTIN

PITCH ANGLE

FLIGHT PATH ANGLE

ANGLE OF ATTACK (AOA)ANGLES SYSTEM

SYSTEM OF ANGLES and VECTORS

This annex is as clarification for those persons who does not have knowledge about Mechanical Physics. Theoretically, the ideal flight condition is when the value of the AOA is zero, this happens when the direction of the thrust and the flight path are the same; but this is a physics’s art that I ask for excuses by not to explain in this site. In any case, the measurement of the structural elasticity will solve these systems of angles and vectors, in a simple and exact way easy to understand for everybody interested in aeronautics.

DRAG

LIFT

WEIGHT

THRUST

VECTORS SYSTEM

In the Mechanical Physics the forces are represented as vectors.

This is a clear sample of what we can achieve in a simple and inexpensive way in civil aircrafts with “fly by wire” systems.