However, the signature, reflectivity and Radar Cross Section (RCS) of the ship can be significantly reduced by the following measures/ technology- use of suitable visual camouflage, construction with low reflectivity composite materials (fibreglass/carbon fibre/PVC), ensuring the superstructure is flush with the hull with minimum projections, use of tumblehome hull (a hull that grows narrower above the waterline), reducing acoustic signature (use of muffled exhaust systems/non-cavitating propeller shapes that reduce formation of air bubbles /use of water-jets for propulsion), reduction of thermal emission (by mixing hot engine exhaust with cold air), reducing Electromagnetic (EM) emissions (by greater use of passive sensors/minimum use of radio) and avoiding perpendicular surfaces (right angles) in design. Surface Naval warships can be detected using Sound Detection & Ranging (SONAR), radars or Infra-Red (IR) detectors. Centre for International Maritime Security The use of material and technology to produce a smaller radar cross-section or to reduce sound and electronic emissions are all common attributes of what is commonly considered a stealth ship.
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