In an attempt to fix the wingtip stall issue, four Pyrys (PY-1, -24, -32 and -37) were equipped with trapezoidal wings, as well as serving to test these structures for the VL Myrsky. While these new wings did reduce the risk of stalls, they made the aircraft even more unstable than before.
To combat wingtip stall problems, four Pyrys (PY-1, -24, -32 and -37) were equipped with trapezoidal wings for testing against the VL Myrsky. Although these new wings reduced stall risk, they also increased the aircraft's instability.