Osetr-class submarine

{{Infobox ship image

|Ship image=Russian submarine Sig.png

|Ship image size=300px

|Ship caption= Russian submarine Sig

}}

{{Infobox ship class overview

|Name=Osetr class

|Builders=Libau Arsenal, Latvia

|Operators={{navy|Russian Empire}}

|Class before=

|Class after=

|Subclasses=

|Cost=

|Built range=

|In service range=

|In commission range=1905–1913

|Total ships building=

|Total ships planned=

|Total ships completed=6

|Total ships cancelled=

|Total ships active=

|Total ships laid up=

|Total ships lost=

|Total ships retired=6

|Total ships preserved=

}}

{{Infobox ship characteristics

|Hide header=

|Header caption=

|Ship type= Submarine

|Ship displacement=* 153 tons surfaced

• 187 tons submerged

|Ship length= {{convert|22|m|ftin|abbr=on}}

|Ship beam= {{convert|3.6|m|ftin|abbr=on}}

|Ship draught= {{convert|3.7|m|ftin|abbr=on}}

|Ship propulsion=*2 shafts: petrol / electric

• 2 × {{convert|120|hp|abbr=on|lk=in}} / 2 x {{convert|65|hp|abbr=on}}

|Ship speed= * {{convert|8.5|kn|lk=in}} surfaced

• {{convert|4.5|kn}} submerged

|Ship range=

|Ship complement=12 (including 2 officers)

|Ship armament=3 × 18-inch torpedo tubes (2 bow, 1 stern)

|Ship notes=

}}