nuk92
commented
2 years ago I'd like to add a few things to this request:
- The first Una Class was comissioned in 1983 not 1993
- The max depth is 120m
- Docking Facilities: 4x R-1 SDVs
Ratni Brodovi Jugoslavenske Ratne Mornarice 1945-1991, Zvonimir Freivogel, Zagreb 2021, ISBN: 9789533660042 https://imgur.com/Ug2jhoo https://imgur.com/N9YONAF
- Regarding the bottom mines it could carry 4x AIM-M.70 or 4x AIM-M.82 (which were shorter than M70)
- The radios were secure
- All Una Class Subs had PP-10M (improved version with 1000m range) active and PSO-1-2 passive sonars. here's the P-913 Zeta museum sub in Slovenia which wasn't in use later on like Croatia's Velebit: https://imgur.com/zR3YXOR https://imgur.com/wmifzxS https://imgur.com/GqUTgJi https://www.mycity-military.com/imgs2/54436_62742094_100_2791.jpg https://imgur.com/L4wKX43 https://www.24ur.com/novice/znanost-in-tehnologija/jugoslovanske-podmornice.html
The periscope was the most advanced which Yugo subs ever had and has night vision. The Una Class would have been used for reconnaissance missions near enemy shores aswell:
- CK032 Periscope (LLTV, EO)
https://images.24ur.com/media/images/1200xX/Apr2019/c2ec69cc15_62235688.jpg?v=d41d https://imgur.com/uDeUDsv
Periskop Barr&Stroud CK032 opremljen za nocno opazovanje
Periscope Barr & Stroud CK032 equipped for night observation
The Barr & Stroud periscope has excellent optical properties and the possibility of night observation, but they did not buy an azimuth plate connected to a gyrocompass that would allow the submarine commander to directly read the azimuth in the eyepiece.
Periskop Barr&Stroud ima odlicne opticne lastnosti in moznost nocnega opazovanja, niso pa kupili azimut plosce povezame s zirokompasom ki bi poveljniku podmornice omogucile neposredno odcitavanje azimuta v okularju.
DB Selector
DB3K
Baseline
N/A
Hypothetical
No
Name
P-911 Tisa (Una-class, Type 911)
Class
P-911 Tisa (Una-class, Type 911)
Country
Yugoslavia/Serbia/Croatia
Service
Navy
In Commission
1983-2005
Length (m)
18.8m (20.9m Velebit)
Beam (m)
3m
Draft (m)
2.5m
Standard Displacement (t)
76 (88 Velebit)
Submerged Displacement (t)
88 (99 Velebit)
Empty Displacement (t)
Not disclosed
Max Depth (m)
105
Complement
4 + 6 swimmers
Primary Propulsion Type
Electric (UUVs)
Propulsion
2 × 18 kW (24 hp) electric motor (1 diesel-generator, 2 Koncar electric motors - Velebit)
Flank Speed at Surface (kt)
7/8 (8 Velebit)
Flank Speed Submerged (kt)
8/11 (11 Velebit)
Range (nm) at Speed (kt)
250–270 nmi at 3 knots (500nm @ 8kts Diesels/ 135nm @ 3kts Batteries - Veledit)
Range (nm) on AIP
N/A
Fuel Capacity (kg)
batteries only (uncertain for Velebit)
Sensors
Optical; Periscope (Velebit - radar, PP-10, PSU-1-2 sonars)
Mounts
Racks for Mines or SDVs
Magazines
4 × R-1swimmer delivery vehicles or 4 × AIM-70 bottom mines or 6-12 x Limpet Mines
Comms/Datalinks
VHF/UHF Radio
sub Codes
Snorkel
Comments
P914 Zeta captured by Croatia 1991 and renamed P-01 Velebit, it was put through a modernization which saw a diesel generator fitted to greatly improve its endurance as well as upgraded sensors. This came at the expensive of some batteries.
Conflicting data on surface/submerged top speed. Provided the high and low numbers from sources. May actually be full/flank.
Sources
http://www.hisutton.com/Yugo_X-Craft.html http://navypedia.org/ships/yugoslavia/yu_ss_tisa.htm https://www.navypedia.org/ships/croatia/cro_ss_velebit.htm https://en.wikipedia.org/wiki/Una-class_submarine
P-01 Velebit