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Series Model Variants • Do 28 - Prototype Model Designation; Lycoming O-360-A1A engines of 180 horsepower. • Do 28A-1 - Main production model designation; fitted with Lycoming O-540-A1A engines of 250 horsepower each; increased wingspan from prototype. • Do 28A-1-S - Floatplane conversion model based on the Do 27A-1. • Do 28B-1 - Based on the Do 28A model fitted with Lycoming IO-540 engines; redesigned nose and tail; increased fuel capacity; 60 examples produced.

• Do 28B-1-S - Proposed Floatplane based on the Do 28B-1. • Do 28B-2 - Single production model; fitted with Lycoming brand TIO-540 turbocharged engines.

• Do 28C - Proposed eight-seat passenger model. • Do 28D - Seven production models featuring new fuselage, wing and tail; fitted with IGSO-540 series engines.

• Do 28D-1 - 54 production models based on Do 28D models. • Do 28D-2 - 172 examples produced; based on Do 28D models with lengthened fuselage; increased overall MTOW.

• Do 28D-2/OU - Environmental Patrol Platform based on Do 28D model. • Do 28D-2T - Single Do 28D-2 model fitted with Avco Lycoming TIGO-540 series engines with turbochargers. • Do 28D-5X Turbo Skyservant / 'TurboSky' - Single prototype example fitted with Lycoming LTP-101-600 turboprop engines. • Do 28D-6X Turbo Skyservant - Single prototype example fitted with PT6A-110 turboprop engines. • Do 28E-TNT - Single trial example fitted with experimental wing; based on Do 28D model. • Do 28 G.92 - Conversion of Do 28D models by Zlovakia for skydiving purposes; fitted with 2 x Walter M 601-D2 series 450 horsepower turboprop engines; seven examples in existence. • Do 128-2 - 'Improved' Do 28D model • Do 128-6 - Production Designation of Turbo Skyservant model of which 6 were produced.

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In the mid-1950s, Dornier Flugzeugbau GmbH of West Germany developed the single engine Do 27 Short Take-Off and Landing (STOL) lightweight utility-minded aircraft. This little high-wing cantilever aircraft went on to a very successful service life with many variants and operators through both civilian and military markets. From this design came a new offering, a two-engine version of the Do 27 which became the Do 28 of 1959.

This model emerged with the same high-wing layout and a pair of underslung Lycoming engines driving three-bladed propellers. The Do 28 retained many of the key qualities of the Do 27 before it including its STOL capabilities. The original Do 28 line was led by the prototype which was designated simply as 'Do 28'. This was fitted with 2 x Lycoming O-360-A1A engines of 180 horsepower each driving two-blade propeller units. First flight was on April 29th, 1959. Then followed the Do 28A-1 which fitted O-540-A1A engines of 250 horsepower.