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New PDF release: Aztec, Mixtex & Zapotec Armies

By John Pohl, Angus McBride

ISBN-10: 1855321599

ISBN-13: 9781855321595

Аннотация издательства:
Around advert 1450 a brand new Mexican state emerged known as the Aztec Empire of the Triple Alliance. They succeeded in making themselves the main robust and feared civilisation within the Americas. The Mixtec and Zapotec peoples have been contemporaries of the Aztec international locations, and either shaped alliances and fought many wars opposed to them. With Angus McBride's ordinary caliber paintings on 8 complete web page color plates, plus lots of different illustrations from numerous assets, this paintings by means of John Pohl investigates the heritage, uniforms and weaponry of Aztec, Mixtec and Zapotec armies.

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Additional info for Aztec, Mixtex & Zapotec Armies

Sample text

In this analysis, the signature is constant at all frequencies. Actual aircraft signatures are considerably more complex, and of course, information about them is restricted. The intent of the three shapes is to depict how general patterns of low observable reduction give attackers a revolutionary edge in mission employment. The Fuzzball signature is a hypothetical shape that is constant from all aspects. The ideal shape, the Fuzzball with uniform reduction at all angles, could in theory achieve remarkable results at the lowest levels.

They appear on many modern aircraft for sound aerodynamic reasons. For instance, viewed from the side, the F-15 Eagle has a surface area of about 25 square meters. Yet because of the aircraft’s numerous dihedrals and surfaces pointing flat to the radar, a sideaspect RCS for the aircraft is many times larger, about the size of a house. One solution to the side aspect problem is to eliminate vertical stabilizers, as was done with the B-2 stealth bomber. Diffraction from Aircraft Scattered Waves Creep Around Tubular Surface Scattering From Sharp Corners Scattering From Conical Point ■ ■ Radar Waves Grazing a Circular Structure can Creep Around its Circumference Waves Striking a Sharp Edge are Scattered (Diffraction) Cavities and Ducting Engine Inlet Diffraction Cat’s Eye Analogy W hen specular reflection is reduced, other scattering mechanisms from many features of an aircraft can greatly affect the radar cross section.

What the Radar Sees ■ Radar “sees” the area defined by the returned radar waves ■ This can be much larger or much smaller than the physical area ■ Radar cross section reduction shrinks the size of return field ■ RCS is sum of return vectors RCS The sum of the major reflective components of the aircraft’s shape is defined as radar cross section. Radar cross section is the area (width and length) of the scattered wave field being returned toward the radar. Generally, the size of the radar cross section of a conventional aircraft is much larger than the physical size of the aircraft.

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Aztec, Mixtex & Zapotec Armies by John Pohl, Angus McBride

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