Stealth Technology
The Hamina class has been designed and constructed as stealth ships with minimal magnetic, heat and radar signatures.
The shape of the vessel has been designed to reduce radar signature. Metal parts have been covered with radar absorbent material, and the composite parts have radar absorbent material embedded in the structure. Radar transparent materials (kevlar, balsa) have been used where applicable.
Unlike glass fiber, carbon fiber blocks radio waves. This protects ship's electronics against electromagnetic pulse. In addition, it stops any radio frequency signals generated by ships electronic devices to escape outside. Except for the bridge, the vessel has no windows that would allow the signals to escape.
The vessel contains hardly any steel parts, thus generating very low magnetic field. The remaining magnetic field is actively canceled with electromagnets.
Exhaust gases can be directed underwater to minimize thermal signature, or up in the air to minimize sound in submarines direction. 50 nozzles around the decks and upper structures can be used to spray seawater on the vessel to cool it. In addition, the nozzles can be used to clean the ship after chemical attack or radioactive fall-out.
Read more about this topic: Hamina Class Missile Boat
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