Model of the Dutch navy submarine built at the start of the WWII.

The 21 Class contains seven submarines still incomplete at the start of the German invasion of the Netherlands. Four of them (O21,O22,O23 and O24) escaped to the United Kingdom.

Unfortunately two of them (O25, O26 and O27) didn't make it so far and were ceptured by the German Navy.All tree were ordered to complete by the Germans and entered service as UD-3, UD-4 and UD-5

The submarines were built at tree different shipyards:The O21 and O22 at Koninklijke Maatschappij De Schelde in Vlissingen.The O23, O24, O26 and O27 at RDM in Rotterdam and the O25 at Wilton Feijenoord in Rotterdam.

The O21 class was a very modern submarine and could compare with every submarine in years of the WWII.

The Submarine was equipped with a new Dutch invention the Snuiver but the conservative UK navy did'nt see the potential and removed them from the four submarines when they were completed in England. The Germans saw the possibilities and used the Schnorkel in the U boats in the second part of the war.

The O21 was one of the only 14 submarines who sank a German U-boat (U-96 VII C) in the WWII.

Specs:

Laid down 1937Launched oct 1939Commissioned 10-may 1940End of service 2-11-1957

Displacement: 990 Tons Surfaced , 1205 Tons submerged.Length: 77,7 mBeam: 6,8 mDraught: 3,95 m

Speed: 19,5 knts surfaced, 9knts submerged

Complement: 39

Armamant: 4x533mm bow tubes, 2 533mm tubes in the Stern 2x533mm externel traversing midships.

Model specs

This model is designed for RC use, best printed in ASA but PLA (+) will do. After printing and gluing the parts together it is better to treat with epoxy to make the hull more water and heat resistant.

The hull is split in 2 parts, top and bottom en integrated bulkheads for a 70 mm WTC. The hull is a little bit narrow.

Hull in 2 parts easy toe reach the WTCIntegrated mini servo mount for the bow diev planes (use a watertight servo)2 Bow types, one with the top torpedo doors open, one with closed torpedodoorsLength: 155,4 cm cmWidth: 13,6 cm cmHeight: (With Stand): 31cm

3D PRINTING SETTINGSPrinted with: Bambulab P1s

Printebed: 200x200x200 or biggerFilament: PLA or ASATemp: 210C (PLA)