檢視 SPP-1水下手槍的原始碼

{{Infobox Weapon
|name=SPP-1
|image=
|caption= 
|origin={{flagcountry|Soviet Union}}
|type=[[Underwater firearm|Underwater]] [[Pistol]]
<!-- Type selection -->
|is_ranged=yes
<!-- Service history -->
|service= 
|used_by=
|wars= 
<!-- Production history -->
|designer= 
|design_date=
|manufacturer=[[TSNIITOCHMASH]]
|production_date=1971
|number= 
|variants= 
<!-- General specifications -->
|weight=950 g empty 
|length=244 mm (9.606 inches)
|part_length= 
|width=37 mm
|height=136 mm
|crew=
<!-- Ranged weapon specifications --> 
|cartridge=
|caliber= 4.5x40R 
|action=
|rate=
|velocity= 240-250 m/s in air
|range= in air, 20 m; in water, 17 m at depth of 5 m; 11 m at depth of 20 m; 6 m at depth of 40 m
|max_range=
|feed= 4 barrels with a cartridge in each
|sights= 
}}
The 4.5 mm '''SPP-1 Underwater Pistol''' was made in the [[USSR]] for use underwater by Soviet [[frogmen]] as an [[underwater firearm]]. It was developed in the late 1960s and accepted for use in 1971. Underwater, ordinary-shaped bullets are inaccurate and very short-range. As a result, this pistol fires a round-based 4.5mm caliber steel dart about 4.53 inches (115 mm) long, weighing 12.8 g, which has longer range and more penetrating power than [[speargun]] spears. The complete cartridge is 145 mm  = 5.71 inches long and weighs 17.5 g.
 
It has four barrels, each containing one cartridge. Its ammunition comes as a clip of four cartridges which is inserted into the pistol's breech.

Its barrel is not [[rifling|rifled]]; the fired projectile is kept in line by [[hydrodynamics|hydrodynamic]] effects. As a result, it is somewhat inaccurate when fired out of water.

Depth reduces range because the higher pressure closes the cavity sooner. Once the projectile is no longer [[supercavitation|supercavitating]], hydrodynamic drag increases greatly, and the projectile becomes unstable.

Its stated lethal range is the range from which it can easily penetrate a padded underwater suit or a 5 mm thick glass facepiece.

A double-action firing mechanism fires one cartridge sequentially for each pull of the trigger. When all four cartridges are spent, the gun can be reloaded above or below water.

The SPP-1M pistol is essentially the same as the SPP-1 but:-
* It has an extra spring above the [[Sear (firearm)|sear]] to improve the trigger pull.
* Its trigger guard is larger to accommodate diving gloves.

==See also==
* [[Underwater firearm]]
* [[List of Russian Weaponry]]

==External links==
* [http://world.guns.ru/handguns/hg140-e.htm Picture and information] <!-- down as of 2006/10/31 -->
* [http://www.securityarms.com/20010315/galleryfiles/2100/2153.htm Technical specification]
* [http://www.cruffler.com/trivia-November01.html Description, image of firearm and darts, and specifications]
* [http://www.kgb-militaryschool.com/view/spp-1m Image of firearm, breech opened, and specifications]

[[Category:Pistols]]
[[Category:Underwater firearms]]
[[Category:Weapons of Russia]]
[[Category:Cold War weapons of the Soviet Union]]