SM UB-109

SM UB-109 was a German Type UB III submarine or U-boat in the German Imperial Navy (Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 31 December 1917 as SM UB-109.

UB-109 was sunk by mine in the English Channel on 29 August 1918.

Construction
She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 7 July 1917. UB-109 was commissioned later the same year. Like all Type UB III submarines, UB-109 carried 10 torpedoes and was armed with a 8.8 cm deck gun. UB-109 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7420 nmi. UB-109 had a displacement of 510 t while surfaced and 629 t when submerged. Her engines enabled her to travel at 13.3 kn when surfaced and 7.4 kn when submerged.