The first Avia fighter, the BH-3 monoplane.

The experimental BH-19 monoplane.

The BH-26 was Avia's first attempt to produce a two-seat fighter, and, built in small numbers, it entered service as the B 26 in the late 'twenties.

The BH-23 - experimental lightweight derivative of the BH-21.

A general arrangement drawing of the BH-21.