Thetis was the name of a floating radar decoy used by German U-boats during the Second World War. The device was stored dismantled in the bow compartment as a pole about two metres long. Assembly usually took place in the U-boat's conning tower, and could be assembled in about four minutes (FuMT 2 - Thetis IIC). Later versions could be launched from a standard torpedo tube (FuMT 4 - Thetis US). When deployed, it was extended to a total length of eight metres, half of which was submerged. The upper half had a series of reflectors that were tuned to Allied anti-submarine radar wavelengths to give the same return signal as a U-boat. The number of Thetis decoys carried varied between different U-boats:
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| - Thetis (Täuschkörper) (de)
- Thetis (inganno radar) (it)
- Thetis (decoy) (en)
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| - Thetis, eigentlich „Funkmeß-Täuschungsgerät“ (FuMT), war im Zweiten Weltkrieg der deutsche Deckname für ein von der Kriegsmarine hauptsächlich im Jahr 1944 eingesetztes Täuschmittel, das den Radargeräten der Alliierten falsche Positionen von Seefahrzeugen („Scheinziele“), insbesondere von U-Booten, vorgaukeln sollte. Der Name leitet sich aus der griechischen Mythologie von der Meeresnymphe Thetis ab. (de)
- Il Thetis era un ingannatore radarutilizzato dagli U-Boot tedeschi nella seconda guerra mondiale per confondere i radar alleati. Il congegno veniva trasportato sotto la forma di un palo lungo circa due metri. Quando veniva impiegato si estendeva fino a una lunghezza complessiva di 8 metri, metà dei quali restava immersa. La parte superiore aveva una serie diriflettori radar accordati sulla stessa lunghezza d'onda dei radar anti-sommergibile per restituire la stessa traccia radar di un U-Boat. L'imbarcazione tipica di questa classe, l' disponeva di 12 ingannatori Thetis. (it)
- Thetis was the name of a floating radar decoy used by German U-boats during the Second World War. The device was stored dismantled in the bow compartment as a pole about two metres long. Assembly usually took place in the U-boat's conning tower, and could be assembled in about four minutes (FuMT 2 - Thetis IIC). Later versions could be launched from a standard torpedo tube (FuMT 4 - Thetis US). When deployed, it was extended to a total length of eight metres, half of which was submerged. The upper half had a series of reflectors that were tuned to Allied anti-submarine radar wavelengths to give the same return signal as a U-boat. The number of Thetis decoys carried varied between different U-boats: (en)
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| - Thetis, eigentlich „Funkmeß-Täuschungsgerät“ (FuMT), war im Zweiten Weltkrieg der deutsche Deckname für ein von der Kriegsmarine hauptsächlich im Jahr 1944 eingesetztes Täuschmittel, das den Radargeräten der Alliierten falsche Positionen von Seefahrzeugen („Scheinziele“), insbesondere von U-Booten, vorgaukeln sollte. Der Name leitet sich aus der griechischen Mythologie von der Meeresnymphe Thetis ab. (de)
- Thetis was the name of a floating radar decoy used by German U-boats during the Second World War. The device was stored dismantled in the bow compartment as a pole about two metres long. Assembly usually took place in the U-boat's conning tower, and could be assembled in about four minutes (FuMT 2 - Thetis IIC). Later versions could be launched from a standard torpedo tube (FuMT 4 - Thetis US). When deployed, it was extended to a total length of eight metres, half of which was submerged. The upper half had a series of reflectors that were tuned to Allied anti-submarine radar wavelengths to give the same return signal as a U-boat. The number of Thetis decoys carried varied between different U-boats:
* U-66 carried approximately 12 units during her 10th and last patrol between 16 January 1944 and 6 May; all were used in the Bay of Biscay.
* U-91 carried 16 units during her 6th and last patrol between 25 January 1944 and 25 February.
* U-371 carried an unknown number of units during her 21st and last patrol between 23 April 1944 and 4 May.
* U-575 carried 15 units during her 13th and last patrol between 29 February 1944 and 13 March. U-575 would surface every night and laid a total of 10 on her outward voyage, the remaining units were to have been laid in the same area on her return.
* U-744 carried 20 units during her 2nd and last patrol between 24 February 1944 and 6 March. U-744 used them on her outward voyage between 11°W and 12°W in the Bay of Biscay. The first time the Allies knew about the "Thetis" was in a coded radio message to all U-boats transmitted on 11 January 1944. "Thetis" was introduced in January, when large numbers were released into the Bay of Biscay in July to simulate U-boat patrols during the Battle of Normandy. (en)
- Il Thetis era un ingannatore radarutilizzato dagli U-Boot tedeschi nella seconda guerra mondiale per confondere i radar alleati. Il congegno veniva trasportato sotto la forma di un palo lungo circa due metri. Quando veniva impiegato si estendeva fino a una lunghezza complessiva di 8 metri, metà dei quali restava immersa. La parte superiore aveva una serie diriflettori radar accordati sulla stessa lunghezza d'onda dei radar anti-sommergibile per restituire la stessa traccia radar di un U-Boat. L'imbarcazione tipica di questa classe, l' disponeva di 12 ingannatori Thetis. Fu impiegato per la prima volta nel gennaio 1944 e furono immessi in quantità nel Golfo di Guascogna nel successivo luglio per simulare il pattugliamento di U-Boot durante lo sbarco in Normandia. (it)
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