The PWS-103 was a high performance, Polish 15 m (49 ft 3 in) span sailplane developed from the longer-span PWS-102 just before World War II.
Behind the wing the fuselage tapered to an integral, ply-covered, curved fin with a broad, fabric-covered rudder.
The elliptical plan horizontal tail, with its ply-covered tailplane and fabric-covered split elevators, was mounted on top of the fuselage.
[1] Samolotypolskie cites a later work by Glass as saying neither of two prototypes was finished before the Soviet invasion of northern Poland late in September 1939.
In this account they were completed in Poland over the winter then in early 1940 moved to Moscow where they were highly rated by the Soviet pilots who tested them.