×
Aircraft / Aviation Vehicles & Artillery Infantry Arms Warships & Submarines Military Pay Scale Military Ranks
HOME
NAVAL WARFARE
MODERN FLEETS
COUNTRIES
COMPARE
BY CONFLICT
BY TYPE
BY DECADE
WORLD WAR 2

HIJMS RO-100 (Kaisho / Type KS)


Short-Range Coastal Submarine (1942)


Naval Warfare

1 / 1
Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

Jump-to: Specifications

None of the RO-100 class coastal submarines of the Imperial Japanese Navy survived to see the end of World War 2.



Authored By: Staff Writer | Last Edited: 12/01/2017 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
Advertisements
Development and production of the RO-100 series (sometimes referred to as "Kaisho" or "small" or simply Type "KS") of Japanese submarines was started in earnest beginning in 1940. The vessels (eighteen in total) were designed as short-ranged coastal submarines, originally charged with protection of the homeland coast but her service extended with the reach of the Empire as required. The RO-100 were produced with several design faults that would eventually do the type in by limiting her capabilities immensely when facing off against Allied firepower - be it from the sea or air. Amazingly, because of glaring design drawbacks, none of the 18 total RO-100 class of submarines would last through to the end of the war, most falling prey to Allied aircraft attacks and not navy vessels.

Categorized as coastal submarines - and designed as such - the RO-100 series was allowed a shallow overall operating depth limited to just 245 feet. Additionally, the type carried only eight total torpedoes of 533mm size firing from four bow-positioned tubes. A 76mm deck cannon was almost always removed. Power was derived from surface diesels generating 1,100bhp and electric motors producing 760 horsepower and powering two shafts. The smallish internal workings made accommodations for up to 38 sailors and officers.

As the Empire expanded, the requirements of the RO-100 class grew, often forcing it to operate in deep waters against armored targets that it was never intended to come up against. The system could, however, hold its own against the basic merchant vessels on the seas but it became David and Goliath scenarios when the RO-100 class was called to take on the heavily armored and armed US destroyers operating in Pacific waters. This became increasingly the norm as the war progresses. As a result, losses for the type were horrendous, with many being sunk from the air and a handful by a single US Navy destroyer (the USS England to be exact). The RO-100-class was also not helped by its noted poor handling capabilities.
Advertisements
The RO-35 (Type K6) appeared alongside the RO-100 through production and was a larger (and more improved) variant of the base RO-100 class. Only one KO-35 survived the war with no fewer than 60 of the type being canceled before production was underway.

The RO-106 was credited with the sinking of the LST-342 landing ship off the coast of New Georgia while the RO-108 was credited with the sinking of the American destroyer USS Henley off of New Guinea, both actions occurring in 1943. Beyond that, the class was responsible for sinking a total of 35,200 tons of Allied cargo. Production of the KO-100 was undertaken at the Kure Navy Yard and the Kawasaki Yard at Kobe.

Specifications



Service Year
1942

Origin
Imperial Japan national flag graphic
Imperial Japan

Complement
38
PERSONNEL


Class
RO-100 class
Number-in-Class
18
VESSELS
Ships-in-Class


RO-100; RO-101; RO-102; RO-103; RO-104; RO-105; RO-106; RO-107; RO-108; RO-109; RO-110; RO-111; RO-112; RO-113; RO-114; RO-115; RO-116; RO-117


National flag of modern Japan Imperial Japan
(OPERATORS list includes past, present, and future operators when applicable)
Submerged Attack
Traveling under the surface to search, track, and / or engage or reconnoiter areas.
Maritime Patrol
Active patroling of vital waterways and maritime areas; can also serve as local deterrence against airborne and seaborne threats.
Fleet Support
Serving in support (either firepower or material) of the main surface fleet in Blue Water environments.


Length
199.9 ft
60.93 m
Beam
20.0 ft
6.10 m
Draught
11.5 ft
3.51 m
Displacement
782
tons


Installed Power: 2 x surface diesel engines developing 1,100 horsepower (surface) with 2 x electric motors generating 760 horsepower (submerged) driving 2 x shafts.
Surface Speed
14.0 kts
(16.1 mph)
Submerged Speed
8.0 kts
(9.2 mph)
Range
3,511 nm
(4,040 mi | 6,502 km)


kts = knots | mph = miles-per-hour | nm = nautical miles | mi = miles | km = kilometers

1 kts = 1.15 mph | 1 nm = 1.15 mi | 1 nm = 1.85 km
4 x 21" (553mm) torpedo tubes (bow mounted; 8 total torpedoes)
1 x 76mm deck gun (optional)


Supported Types


Graphical image of a modern warship turreted deck gun armament
Graphical image of an aircraft aerial torpedo


(Not all weapon types may be represented in the showcase above)
None.


Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Korean War
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Vietnam War
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2


Ribbon graphics not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective naval campaigns / operations / periods.

Advertisements





Disclaimer | Privacy Policy | Cookies


2022 Military Pay Scale Army Ranks Navy Ranks Air Force Ranks Alphabet Code DoD Dictionary American War Deaths French Military Victories Vietnam War Casualties

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world, WDMMA.org, the World Directory of Modern Military Aircraft, and SR71blackbird.org, detailing the history of the world's most iconic spyplane.


Facebook Logo YouTube Logo

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-