Blohm & Voss BV.138, part two

As we said in the last post about the BV.138, the first prototypes were redesigned in 1938 due to stability problems both in air and water.
The new design shared the basic layout of the first two prototypes but with a longer hull, larger tail surfaces and stronger booms. The first of the redesigned aircraft was designated as BV.138A-01 and was followed by five more pre-production aircraft which were armed with one 20mm MG FF in the frontal turret, and flexibly-mounted rear-firing 7,92mm MG 15 machine guns. One just behind the central engine and another one at the back of the hull with a restricted field of fire thanks to the twin booms and the horizontal section of the tail. It could also carry up to three SC50 bombs under the root of the starboard wing.
The five pre-production aircraft were followed by twenty-five A-1 production aircraft, which flew for the first time in April 1940, the first two of which took place in the Invasion of Norway, but the type didn't really enter service until October-November 1940.
There were some variants apart from the BV.138A. The second version, the BV.138B. This variant was an strengthened version powered by three Junker Jumo 205D engines which yielded 880hp of power. It was armed with two 20mm MG 151/20 cannons, one of them placed in the frontal turret and another one in a rear turret plus the usual 7.92 MG 15 defensive machine gun placed behind the central engine. It could carry 150kg (330lb) of bombs below the root of the starboard wing or four times that payload at maximum overload weight. A total of 18 machines of this variant were produced with one of them being the pre-production one, designated BV.138B-0 and the rest BV.138B-1.
All of them, both A and B variants were manufactured at Blohm & Voss Abt. Flugzeugbau, in Hamburg in a production period ranging from 1939 to 1940 for the A variant and 1940 to 1941 for the B variant.
Due to the lack of available drawings and blueprints, we've only could draw the C variant which physically doesn't differ too much from both A and B variants.

Sources:
1. http://www.historyofwar.org/articles/weapons_blohm_und_voss_bv_138.html
2. https://en.wikipedia.org/wiki/Blohm_%26_Voss_BV_138
3. https://www.valka.cz/Blohm-Voss-BV-138-A-1-t59211
4. https://www.valka.cz/Blohm-Voss-BV-138-B-1-t59212
5. Wydawnictwo Militaria 64 - Blohm & Voss Bv 138 (Translated)