108:, the first boat from series production, it was then accidentally discovered that the boat stopped responding to the rudder at high speed and full rudder positions but started to display the effects described above. When investigating what caused this behaviour, the basic principles of the Lürssen effect were discovered. Starting with
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of 1926. The displacement hull was superior due to its performance in rough seas. A planing hull, sitting down at the stern, would lose speed when a big wave slapped against the hull. The displacement hull tends to stay more level and "plow through" the wave. This hull shape was further developed as
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The effect was noticed at speeds above 25 knots, by swinging the "effect" rudders outboard by 30°. Once attained, the effect rudders could be swing back to 17° outboard, and the speed could be reduced to as little as 20 kn while still maintaining the benefits of the effect.
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The adoption of a round-bottomed displacement hull shape (which was more efficient than the more common hard chine V-bottom) together with powerful engines allowed the Lürssen shipyard to attain a high speed of 33 kn with its motor boat
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provided by two small rudders mounted on each side of the main rudder and turned outboard. These rudders force the water under the hull outward, lifting the stern, thus reducing
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167:. Vol. 1. Society of Naval Architects and Marine Engineers. p. 586.
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36:. The Lürssen effect is best remembered for its use during the
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The first of the torpedo boats (the
British called them "
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E-Boat Alert: Defending the
Normandy Invasion Fleet
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142:. Naval Institute Press. p. 36.
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136:James Foster Trent (March 1, 1996).
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244:Explanation of the Lürssen-Effect
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