|Name||No||Yard No||Builder||Laid down||Launched||Comp||Fate|
|Bävern||B, Bä||129||Kockums, Malmö||1918||5.3.1921||6.1921||stricken 10.1944|
|Illern||I, In||291||Örlogsvarvet Karlskrona||1918||30.6.1921||1921||collision 12.8.1943|
|Uttern||U, Ut||292||Örlogsvarvet Karlskrona||1918||25.7.1921||1921||stricken 10.1944|
|Displacement standard, t||429|
|Displacement normal, t||
472 / 650
|No of shafts||
2 6cyl diesels / 2 electric motors
|Power, h. p.||
2100 / 520
|Max speed, kts||
15.2 / 8.2
|Endurance, nm(kts)||3000(15) / 54(6)|
1 x 1 - 57/50 K/55 M89B, 4 - 450 TT (bow, 8)
|Diving depth operational, m||30?|
Advanced Hajen class in which for the account of slightly increased dimensions fuel stowage and surface endurance were increased. They become outdated to the beginning of WW II.
Illern was lost 12.8.1943 as a result of collision with m/s Birkaland in Kalmar straight, salvaged 1.9.1943 but never repaired and sold for BU in 1944.
Many thanks to Wolfgang Stöhr for additional information on this page.