Survey of Chinese midget submarines, Swimmer Delivery Vehicles (SDVs) and Diver Propulsion Vehicles (DPVs).



Midget Submarine Program

Built in 1980-82 at Wuhan shipyard (vicinity 30-32-04N, 114-17-13E), this very basic midget submarine design is about 26m long and 3m across. It is armed with two 21" (533mm) torpedoes in tubes. Although outwardly resembling the Italian designed Cos.Mo.S SX404 the configuration is different in every detail and should not be regarded as a copy. There is no indication that it has a diver lock-out capability except via the torpedo tubes. At lest four were built and one may still be in occasional use.





It is not immediately clear how the propulsion worked although other photos hint at struts supporting a prop in front of the rudder.













THE book on Special Forces subs Covert Shores 2nd Edition. A world history of naval Special Forces, their missions and their specialist vehicles. SEALs, SBS, COMSUBIN, Sh-13, Spetsnaz, Kampfschwimmers, Commando Hubert, 4RR and many more.

Check it out on Amazon



Indigenous Diver Propulsion Device

China developed a crude single-diver DPV based on lightweight torpedo body with external ballast tanks and simple handlebar controls near the front. The diver lay prone on top of the craft. Instrumentation was minimal and there was no watershield so speed would be below 3kts. It does not appear to have entered service.







Russian influenced Diver Propulsion Devices

The Chinese Navy uses a locally produced version of the Russian SOM-1 series of single diver DPV under the designation WRY-001A.











Western Influenced Diver Propulsion Devices



QJY-001 : Chinese copy of American Stidd Diver Propulsion Device (DPD).









QJY-003 : Derived from earlier QJY-001, the QJY-003 differs significantly from the original American Stidd Diver Propulsion Device (DPD). It has a flat nose and lager propulsor requiring a stepped stern section. Overall it appears to be an effort to produce a cheaper product than the Stidd, leveraging alternative components. It is marketed as a police / paramilitary vehicle. Ignore QJY-001 written on the last image.





QY-18 : Chinese DPV similar in configuration to the Italian SUEX Xjoy series.

Length: 0.8m

Weight: 20kg

Body Diameter: 230mm

maximum diameter: 320mm

Speed: 2kts

Operating depth: 20m

Endurance: 1hr



QY-40 : larger capacty version of QY-18.

Length: 1.2m

Weight: 40kg

Body Diameter: 230mm

maximum diameter: 320mm

Speed: 2kts

Endurance: 2.5hrs

Depth: 40m





QX-50 : Chinese DPV with similarities to Farallon scooters

QX-50 Twin : Two QX-50s mounted on the platform normally associated with the Farallon Mk.8 DPV. This platform allows the carriage of a third diver or payload at low speeds.



Rotinor military-grade DPVs have been marketed in China by Glory International Group Ltd.



Indigenous Swimmer Delivery Vehicle Program

News recently broke in the Chinese media that the latest iteration of the Type-093 SSN will have a Dry Deck Shelter (DDS) for SDVs. Observers had known of a modification behind the sail which was thought by most to be a VLS for cruise missiles. It now appears that the flat platform is the base for the DDS:







Chinese media appear to know as little about SDV operations as their Western counterparts. Janes' (who I wuold not put in that bucket!) comment that:

The accompanying text indicates the hangar can accommodate only about 2/3 of the length of the SDV (which it compares with the US Mk VIII SDV) and so remains flooded when the vehicle is docked. Consequently, as transfer of personnel to the SDV cannot easily be achieved with the submarine dived, the graphic shows SF personnel being transferred to the submarine by helicopter. The article refers to this as a wet-deck system and the SSN variant as a Type 093T.



Janes' reservations are well justified. The configuration described is not credible. Clearly the image shows a proper DDS which just happens to have the aft section of an SDV sticking out. There would be no need for the heavy door if it were a wet shelter.

