The prefix IS comes from Iosif Șilimon, the Romanian IAR (Industria Aeronautică Română) aeronautical engineer who designed it.
The –29D model is of all-metal construction while the earlier –29B has wooden wings.
Developments include 19 metre (62 ft) -29E2 and 20 metre (66 ft) -29E3 versions and a flapless, fixed gear 16.5-metre (54 feet) ‘club’ model -29G.
Data from Jane's All the World's Aircraft 1988-89[1][2]General characteristics Performance
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