The two Explorer-class submarines were experimental vessels built for the Royal Navy to test a propulsion system based on the use of highly concentrated hydrogen peroxide (high-test peroxide, HTP) and diesel fuel to achieve high underwater endurance and speeds. Other countries have since developed the concept of the non-nuclear air-independent propulsion submarine to the point where it is a safe technology albeit as an auxiliary power source to a conventional diesel-electric drive, although hydrogen peroxide has long been abandoned and liquid oxygen is generally now preferred.
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| - Třída Explorer (cs)
- Classe Explorer (fr)
- Explorer-class submarine (en)
- エクスプローラー級潜水艦 (ja)
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| - Třída Explorer byla třída experimentálních ponorek postavených pro britské královské námořnictvo. Celkem byly postaveny dvě jednotky této třídy. Ve službě byly od roku 1956. Jejich účelem bylo testování Walterova pohonu s uzavřeným cyklem využívajícího peroxid vodíku. Zároveň je námořnictvo využívalo pro výcvik boje proti rychlým ponorkám. Takto koncipovaný pohonný systém byl vysoce účinný, byl ale velmi nebezpečný kvůli agresivitě a výbušnosti peroxidu. Proto britské námořnictvo ztratilo zájem o tento pohon a zaměřilo se na perspektivnější jaderné ponorky. (cs)
- Les deux sous-marins de classe Explorer sont des bateaux expérimentaux construits pour la Royal Navy afin de tester un système de propulsion basé sur l'emploi du peroxyde d'hydrogène pour atteindre une autonomie élevée et une grande vitesse. (fr)
- エクスプローラー級潜水艦（エクスプローラーきゅうせんすいかん Explorer class submarine）はイギリス海軍の潜水艦。高濃度過酸化水素を用いた閉サイクル蒸気タービンを搭載した非大気依存推進 (AIP) 潜水艦の実験艦。 (ja)
- The two Explorer-class submarines were experimental vessels built for the Royal Navy to test a propulsion system based on the use of highly concentrated hydrogen peroxide (high-test peroxide, HTP) and diesel fuel to achieve high underwater endurance and speeds. Other countries have since developed the concept of the non-nuclear air-independent propulsion submarine to the point where it is a safe technology albeit as an auxiliary power source to a conventional diesel-electric drive, although hydrogen peroxide has long been abandoned and liquid oxygen is generally now preferred. (en)
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| - *780 tons surfaced
*1,000 tons submerged (en)
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| - *High Test Peroxide steam raising plant driving steam turbines
*Diesel-electric
*2 shafts (en)
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| - Třída Explorer byla třída experimentálních ponorek postavených pro britské královské námořnictvo. Celkem byly postaveny dvě jednotky této třídy. Ve službě byly od roku 1956. Jejich účelem bylo testování Walterova pohonu s uzavřeným cyklem využívajícího peroxid vodíku. Zároveň je námořnictvo využívalo pro výcvik boje proti rychlým ponorkám. Takto koncipovaný pohonný systém byl vysoce účinný, byl ale velmi nebezpečný kvůli agresivitě a výbušnosti peroxidu. Proto britské námořnictvo ztratilo zájem o tento pohon a zaměřilo se na perspektivnější jaderné ponorky. (cs)
- The two Explorer-class submarines were experimental vessels built for the Royal Navy to test a propulsion system based on the use of highly concentrated hydrogen peroxide (high-test peroxide, HTP) and diesel fuel to achieve high underwater endurance and speeds. Germany had started experimenting with this technology early in the Second World War and developed it into the Walter cycle. They had built some experimental boats. One of these, the U-boat German submarine U-1407, which had been scuttled at the end of the war, was salvaged and eventually recommissioned into the Royal Navy as HMS Meteorite. This eventually led to the construction of the two Explorer-class experimental vessels, which used steam turbines, the steam being generated using heat from the catalysed interaction of HTP and diesel oil. They used the Porpoise-class hull, modified with retractable superstructure fittings to help streamlining. Being purely experimental craft they had no torpedo tubes or radar fitted, only one periscope and were equipped with backup diesel engines to recharge the batteries and propel them on the surface. The first, Excalibur, was commissioned in March 1958. They were very fast boats, with a top underwater speed of around 49 km/h (26.5 kn) for period up to 3 hours and 22 km/h (12 kn) for 15 hours on one turbine. Because of the use of hydrogen peroxide as a hair bleach, the submarines were nicknamed the Blonde class. As well as providing experience with this type of technology, they also allowed the Royal Navy to practise against fast moving underwater targets. However the use of HTP was not successful, and there were several explosions, which resulted in the second nickname of Exploder being applied to the class and Explorer in particular, while Excalibur had the nickname "Excruciater". The subsequent use of HTP to power torpedoes led to the loss of HMS Sidon and the loss of the Russian submarine Kursk. When the United States developed a nuclear reactor which could be installed in a submarine, the HTP project was abandoned. It was decided that it was not worth converting the class into normal diesel submarines. As a result, Explorer was sold for £13,500 to Thos. W. Ward for breaking up; Excalibur in turn was also subsequently sold to Thos. W. Ward. Other countries have since developed the concept of the non-nuclear air-independent propulsion submarine to the point where it is a safe technology albeit as an auxiliary power source to a conventional diesel-electric drive, although hydrogen peroxide has long been abandoned and liquid oxygen is generally now preferred. (en)
- Les deux sous-marins de classe Explorer sont des bateaux expérimentaux construits pour la Royal Navy afin de tester un système de propulsion basé sur l'emploi du peroxyde d'hydrogène pour atteindre une autonomie élevée et une grande vitesse. (fr)
- エクスプローラー級潜水艦（エクスプローラーきゅうせんすいかん Explorer class submarine）はイギリス海軍の潜水艦。高濃度過酸化水素を用いた閉サイクル蒸気タービンを搭載した非大気依存推進 (AIP) 潜水艦の実験艦。 (ja)
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