After evaluation by the Polish Air Force, the R-Xa won the contest for a liaison plane in December 1929, over PWS-5t2 and PZL Ł.2, having the shortest take-off and landing, good handling at low speed and satisfactory performance, but the factory was ordered to develop design further.
PZL.37 Łoś | PZL P.11 | PZL P.6 | PZL P.24 | PZL.5 | PZL-101 Gawron | PZL | PZL TS-8 Bies | PZL TS-11 Iskra | PZL P.1 | PZL M28 | PZL M-2 | PZL Ł.2 | PZL-5 |