The slab-sided wooden fuselage was replaced by a welded steel-tube structure, it had an elliptical cross section achieved with the help of light formers and a spli axle vee-type undercarriage introduced to replace the original crossed-axle undercarriage.
Even if it wasn't originally ordered by the Czechoslovak authorities, which waited until the BH-33L, it did have some export success and three airplanes were bought by the USSR to preform some tests and 20 were sold to Yugoslavia which also purchased a production license, for the firm Ikarus at their plant of Zemun, close to Belgrade.
Two sub-variants were made one powered by the Bristol Jupiter VI, and the other one, which was the most produced, powered by the supercharged version of the Bristol Jupiter VII. One single BH-33 was fitted with a German BMW Hornet engine, however, as we couldn't find any graphical evidence, we haven't drawn it. It was armed with two Vickers 0.303in machine guns placed in the frontern upper part of the fuselage.
Sources:
1. Salamander Books - The Complete Book of Fighters
2. https://en.wikipedia.org/wiki/Avia_BH-33
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