21 inch Mk.20 Bidder (533 mm)
Contents
Description
Write an introduction to the article in 2-3 small paragraphs. Briefly tell us about the history of the development and combat using the weaponry and also about its features. Compile a list of air, ground, or naval vehicles that feature this weapon system in the game.
Vehicles equipped with this weapon
General info
Tell us about the tactical and technical characteristics of the torpedo.
Effective damage
Describe the type of damage produced by this type of torpedo (high explosive, splash damage, etc)
Comparison with analogues
Give a comparative description of torpedoes that have firepower equal to this weapon.
Usage in battles
Describe situations when you would utilise this torpedo in-game (vehicle, pillbox, base, etc)
Pros and cons
Pros:
- Very long travel distance
Cons:
- Slow torpedo
- No Torpedo mode to influence distance and speed.
- Small warhead size
History
The Mark 20 Bidder was designed around the 1950s. It was intended to become the designated torpedo for both new submarines and surface ships. The Mark 20S was intended to equip the submarines, while the Mark 20E was to be used on surface ships. Both types of torpedoes was passive-seeking battery powered. However, the Mark 20S was smaller than the Mark 20E. The S had a single-speed setting at 20 knots, while the E had a dual-speed mode for target search and attack. The velocity of the E was, respectively, 15 knots and 24 knots. At 15 knots the torpedo had a range of 18000 m, while when running in attack mode at 24 knots it had a range of 5500 m.
The torpedo was to be equipped on the Rothesay and Whitby (HMS Blackpool) class frigates, and some of these ships had torpedo tubes fitted and was ready to receive them. However, due to problems with the programming of the torpedo, the weapon was never fitted nor used by any of these classes. Some years after, the Mark 20E was proposed for the Leander class destroyers, but that consideration was eliminated in the 1960s.
The Mark 20S remained operational in the submarine service up until the 1980s.
Media
Excellent additions to the article would be video guides, screenshots from the game, and photos.
See also
Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:
- reference to the article about the variant of the weapon;
- references to approximate analogues by other nations and research trees.
External links
https://en.wikipedia.org/wiki/British_21-inch_torpedo#Mark_20_Bidder
