Ships / Patrol boats / Dvora class

Dvora class

General Facts

  • TYPE
    Fast patrol boat

  • ORIGIN
    Israel

  • NICKNAMES
    Hai Ou (Taiwanese production)

  • DESIGNED
    Late 1960's (dabur)
    1987 (Dvora)

  • DESIGNER
    Sewart Seacraft (Dabur)
    IAI Ramta (Dvora and subsequent models)

  • PRODUCTION
    1970 - 1977 (Dabur)
    1988 - 1993 (Dvora)
    1993 - 1997 (Super Dvora Mk II)
    2004 - present (Super Dvora Mk III)

  • PRODUCERS
    Israel - IAI Ramta (main producer)
    India - Goa Shipyard Ltd (Mk II)
    Taiwan - CSBC Corporation (Hai Ou)
    United States - Sewart Seacraft (Dabur)

  • QUANTITY
    34 Dabur
    50 Hai Ou
    9 (or more) Dvora
    22 (or more) Super Dvora Mk II
    16 Super Dvora Mk III

  • UNIT COST
    Unknown

  • CHARACTERISTICS
    Good speed and limited draft in Super Dvora models
    Proven effective in littoral combat
    Good ASW capability in original Dabur
    Limited speed in original Dabur

Introduction

The Dvora is a fast patrol boat of Israeli origin. It can be considered a lineage that started with the Dabur in the early 1970's and continues with the Super Dvora Mk III today. Although of US origin, all subsequent production and development is carried out in Israel. These fast boats are considered highly capable in the counter insurgency role. Except for the Taiwanese Hai Ou derivative with anti-ship missiles they are of limited use in coventional warfare.

Layout

All versions of the Dvora follow the layout of the original Dabur. These feature a superstructure and mast amidships, armament on bow and stern and two diesel engines connected to two shafts. The crew ranges from 5 to 11 depending on mission and armament suite.

Firepower

The main armament of all early models were a 20mm Oerlikon on the bow and stern. These were supplemented with machine guns and depth charge racks. A number was fitted with tubes for the Mk 46 torpedo. Newer models are fitted with the Typhoon RWS on the bow, usually armed with the 25mm Bushmaster autocannon. A small number is fitted with a single AGM-114 Hellfire missile launcher.

Mobility

The original Dabur had a modest speed of 19 knots. This was improved in the Dvora by fitting more powerful engines. The Super Dvora Mk II and Mk III feature even more powerful engines and have surface drives with thrust vector steering. The result is a 45 kt maximum speed and the ability to operate in very shallow water.

Users

The Dabur was used in quantity by Israeli forces. With newer models entering service many have been sold to South American navies. All marks of Dvora have been actively used by Sri Lankan forces in the conflict with the LTTE. Large quantities of Hai Ou have been used for over two decades by the Taiwanese navy.

Variants

Dabur

The Dabur is the first in line of the Dvora range of fast patrol boats. It was developed by Sewart Seacraft and the first 12 models were produced in the USA. Armament suite is geared towards speedboats and anti-submarine warfare. Up to 8 ships have been fitted with improved engines to increase their speed. The Dabur is difficutl to distinguish from the later Dvora and Super Dvora Mk II.

TypeFast patrol boat
Crew6 to 9
Size19.8 m long
5.5 m beam
1.8 m draft
Displacement39 t full load
Propulsion2x GM 12v-71TA diesel, 2 shafts
840 hp sustained
Mobility19 kt max speed
450 nm range at 13 kt
SensorsDecca Super 101 surface search
Active HF sonar
SystemsElop optronic director
Guns2x 20mm Oerlikon
2x 12.7mm M2HB
SSM-
SAM-
ASW2x DC rack (optional)
Remarks-
TypeFast patrol boat
Crew6 to 9
Size19.8 m long
5.5 m beam
1.8 m draft
Displacement39 t full load
Propulsion2x General Electric diesel, 2 shafts
Mobility30 kt max speed
SensorsHDWS surface search
Active HF sonar
SystemsElop optronic director
Guns2x 20mm Oerlikon
2x 12.7mm M2HB
SSM-
SAM-
ASW2x DC rack (optional)
Remarks

Dvora

The Dvora is a further development of the Dabur design. It is also referred to as the Super Dvora Mk I. Compared to the original Dabur it features a much better speed. The hull is somewhat longer and the sonar has been removed. Some Mk I feature the same improved weapon systems as the Mk II.

The Dvora was produced as the Hai Ou missile craft in Taiwan. They are fitted with two launchers for the Taiwanese Hsiung Feng I anti-ship missile. Lighter engines are installed to compensate for missile weight.

The Super Dvora Mk II is an improved Dvora Mk I. The Mk II differs in having more powerful engines and surface drives that reduce the draft significantly. Late production models have the forward 20mm Oerlikon replaced by a Typhoon remote weapon system fitted with a 25mm Bushmaster autocannon. Some ships are also fitted with a single AGM-114 Hellfire missile launcher.

TypeFast patrol boat
Crew10, incl 1 officer
Size21.6 m long
5.5 m beam
1.8 m draft
Displacement54 t full load
Propulsion2x Detroit 16V-92TA diesel, 2 shafts
1.380 hp sustained
Mobility36 kt max speed
SensorsRaytheon surface search, I-band
SystemsElop MSIS optronic director
Guns2x 20mm Oerlikon (early models)
1x 25mm Typhoon RWS and 1x 20mm Oerlikon (improved models)
2x 7.62mm or 12.7mm machine gun
SSM1x AGM-114 Hellfire launcher (optional)
SAM-
ASW2x 324mm TT for Mk 46 torpedo
2x DC rack
Remarks-
TypeFast missile craft
Crew10, incl 2 officers
Size21.6 m long
5.5 m beam
1 m draft
Displacement47 t full load
Propulsion3 shafts
Mobility30 kt max speed
700 kt max range
SensorsMarconi LN66 surface search, I-band
RCA R76 C5 fire control, I-band
SystemsKollmorgen Mk 35 optical director
AV2 chaff launchers
WD-2A ESM system
Guns1x 20mm Type 75
2x 12.7mm M2HB
SSM2x Hsiung Feng I
SAM-
ASW-
Remarks-
TypeFast patrol boat
Crew10, incl 1 officer
Size25 m long
5.6 m beam
1.1 m draft
Displacement54 t full load
Propulsion2x MTU 12V 396 TE94 diesel, 2 shafts
4.175 hp sustained
Mobility46 kt max speed
1.200 nm range at 17 kt
SensorsRaytheon surface search, I-band
SystemsElop MSIS optronic director
Guns2x 20mm Oerlikon (early models)
1x 25mm Typhoon RWS and 1x 20mm Oerlikon (improved models)
2x 7.62mm or 12.7mm machine gun
SSM1x AGM-114 Hellfire launcher (optional)
SAM-
ASW2x DC rack
Remarks-

Super Dvora Mk III

The Super Dvora Mk III is a much improved Mk II. The superstructure and rear hull have been redesigned. Unlike the previous multi-purpose vessels the Mk III is focussed on high speed interdiction. As such the Mk III lacks all ASW armament. Reduced weapon load and automation results in a crew of only 5 instead of 10. The Typhoon remote weapon system is fitted on the bow.

TypeFast patrol boat
Crew5
Size27.4 m long
5.7 m beam
1.1 m draft
Displacement72 t full load
Propulsion2x MTU 12V 4000 diesel, 2 shafts
Mobility45 kt max speed
1.000 kt max range
SensorsRaytheon surface search, I-band
SystemsElop optronic director
Guns1x 25mm Typhoon RWS
1x 20mm Oerlikon
2x 7.62mm machine gun
SSM-
SAM-
ASW-
Remarks-

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