The genius technical designer Mr. George Mueller buildet only one exemplar of Moswey 4a. That was the last glider he did. The examiner was on the 20.02.1951, the first fligh at the 25.02.1951 on the Airfild Birrfeld. During the time from 1951 to 1977 the orner change four times: Max Schachermann, Karl Ruckstuhl, Emil Berna and Guenter Steiner. At last, the glider was on the Airfild Beromuenster. 1977 it was sold to England on Ted Hull in Dunstale. Mr. Ted Hull sell it 1993 to the "Haltergemeinschaft...." in Switzerland. 1994 again a BAZL examination.

Over than 4000 hours was necessary for restoration the Moswey 4a during the winters from 1999 to 2002. On the 11.07.2002 the first flight after this big work. 

Type	Moswey 4a	Immatriculation	HB-522
Developpment	Georg Müller	Company of fabrication	Georg Müller
First flight of the type	25.01.1951	Number ever built	1
year of fabrication	1950/51	Number of seats	1
Wingspan	15.9 m	Length	6.4 m
weight (empty)	217.4 kg	Wing area	14.7 m2
Wing profile	Gö?	Aspect ratio	17.21
fuselage construction	wood	Construction material	wood
Maximum speed	180 km/h
Best glide ratio	32 @ 84 km/h	Minimum sinking speed	0.6 m/s @ 68 km/h
First owner	Max Schachenmann
Today´s owner	Willy Fahrni 8636 Wald	Home airfield	-
Last revision	10.07.2002	Hours / Flights	1823 hrs / 1326 fl.