These RCS design principles were developed by several navies independently in the 1980s using work done on aircraft RCS reduction as the starting point. Hull shapes include tumblehome hull designs which slope inward from the waterline, and small-waterplane-area twin hulls (SWATH) which allow for better stability when using a tumblehome hull. Also, every effort must be made to have the smallest gaps on the ship as possible. To get around these limitations many ships use features such as panels that cover reflective surfaces or use alternate designs of hardware. Also, cavities that present a horizontal face are to be eliminated since they act like a trap and are very visible to radar. Furthermore, round shapes on the ship are eliminated or covered up, examples include smokestacks and gun turrets.
#PICTURES OF MODERN WARSHIPS AND STEALTH SHIPS SERIES#
A stealthy ship shape can be achieved by constructing the hull and superstructure with a series of slightly protruding and retruding surfaces. Retro-reflective right angles are eliminated to avoid causing the cat's eye effect.
Therefore, the shape of the ship avoids vertical surfaces, which would perfectly reflect any such beams directly back to the emitter.
In designing a ship with reduced radar signature, the main concerns are radar beams originating near or slightly above the horizon (as seen from the ship) coming from distant patrol aircraft, other ships or sea-skimming anti-ship missiles with active radar seekers. US Navy Sea Shadow (IX-529) uses both a tumblehome hull and SWATH to reduce its radar return
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