It is the Polskie Zaklady Skoda, (in English PSW = Polish Skoda Works). See.

-In Polskie Zaklady Skoda and in PZL, the PZS trajectory is clarified.

-It is all the same.

-Below we show a couple of views for the Jupiter VIIF that was manufactured by PZS under Bristol license.

“PZS Jupiter”

“PZS, Jupiter VIIF”

-It is the G-594 that delivers 120 CV, and is known as “Czarny Piotrus” (or “Black Peter”). It was built at the Skoda factory around 1930, and was designed by Stanislaw Nowkunski. It had seven radial cylinders.

“G-594, Black Peter”

-The PZ Skoda S-29 in the main text was also known as the "Mamut". It gave 500 CV approx.

-The GR-760 is very interesting, with 9 radial cylinders, and above all by its superimposed reduction gear.

-The GR-760 would reach 290 CV at 3,300 rpm. This engine is from 1934. See attached photo.

-The history of PZ Skoda is the same as PSW, initials in English for Polish Skoda Works. Later it would be the PZL (around 1935).

-The G-594, and the two G-1620, A and B, are designed by S. Nowkunski: Mors I and II, respectively.

-The G-1620A gives 410 CV at 2,300 rpm. And the G-1620B delivers 470 CV at 2,365 rpm.

-First we present the illustration of a GR-760 with its gearbox and the Mors II installed on the “Czapla” RWD-14 plane.

“GR-760”

-On the Czapla, the Mors II's NACA type fairing ring is so tight that it requires the bulges that correspond to the cylinder rocker boxes.

“Installed Mors II”

-From the aforementioned date, the history of this brand must be followed through PZL or Panstwowe Zaklady Lotnicze.

-In the PZL Appendix 10, there is expanded information with received documentation about the Foka engine, due to engineer Stanislaw Nowkunski, the architect of important previous PZ Skoda engines.

-The new PZL company has its main bases in the WS-1 or Wytwornia Samoloty-1.

-From another base, the WS-2 they would build the Junior with 110 CV. See main text.

From Appendix 9: With permission of curator Mr. Piotr Lop. of the Aeronautical Museum of Krakow (PeT = pl).

-First an advertisement that appeared in one of the documents that have now been digitized at the Aeronautical Museum of Krakow.

“PZS ad (Skoda de Polonia)” (PeT=pl)

-PZS would later be PZL. See both chapters in the main text.

-Next, two of the engines that were made by Skoda, at first with foreign licenses.

-These would be -among others- the Bristol Jupiter, the 450 CV Lorraine, or the 220 CV Wright.

“Lorraine-Skoda, 450 CV” (PeT=pl)

“Wright-Skoda, 220 CV” (PeT=pl)

-Of their own engines are those that bear the curious name of "Czarny Piotrós" or Black Peter, with technical reference G-594. It gave 120 CV. It is the one that appears in the above shown ad.

-Below we also put another photograph of this engine, and that of the "Mamut" known as S-29 giving 500 CV, much larger.

“Skoda's Black Peter” (PeT=pl)

“S-29 or Mamut” (PeT=pl)

“Skoda showroom” (PeT=pl)

-Observing this exhibition we see a radial in the foreground, a Lorraine in the background to the right, and the rare revolver engine by Ing. Brzeski. (see chapter in main text).

“Brzesky's engine” (PeT=pl)

-In this photo we see the rear (mutilated in the main text) with full accessories.