[3] The M-19 was a conventional, low-wing cantilever monoplane with a wing of elliptical planform and fixed, tailskid undercarriage.

The pilot and passenger sat in tandem under a streamlined canopy that fully enclosed the cockpit, and the main wheels were covered with spats.

When the design was finalised, Rubik's calculations were verified by the Aviation Institute in Warsaw and a single prototype contrstucted.

[3] The M-19 was displayed at Budapest's annual International Fair in May 1937,[3] but was involved in a tragedy shortly thereafter.

On 1 July, on its second test flight, the aircraft rolled over, killing veteran pilot István Dobos.