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The Doyn Dart II is an American four/five seater cabin monoplane comprising a re-engineered Piper PA-23 fitted with two Lycoming IO-360 engines, new propellers, engine mountings, ignition and dorsal fins. The Doyn Dart II has an increased top speed of 322 kmh.
Research Doyn Dart II

The Geronimo/Piper Geronimo was an American four/five-seater cabin monoplane. The Geronimo was a 1966 conversion of the Piper PA-23, replacing the engines with two Lycoming O-360-A1D four-cylinder horizontally-opposed air-cooled engine providing a top speed of 335 kmh. Other minor modifications were also made to the structure of the original Piper PA-23, including a one-piece wrap-around windscreen, changes to the shape of the wing tips and a longer nose cone.
Research Geronimo

The Piper PA-23-250 Aztec is a series of American five-seater twin-engine short-range utility light transport aircraft with liaison capability which entered service in 1954 as a development of the Piper PA-23 Apache. The Piper PA-23-250 is a low-wing cantilever monoplane produced in various models, the Piper PA-23-250 Aztec D is powered by two Textron Lycoming IO-540-C4B5 flat-six piston engines providing a top speed of 348 kmh and a range of 1947 km. The
Piper PA-23-250 carries a pilot and up to four passengers or freight in the cabin.
Research Piper PA-23-250

The Piper PA-23 Apache is an American four/five-seater cabin monoplane of all metal construction. The Piper PA-23 Apache is a low-wing monoplane powered by two Lycoming O-320-B four-cylinder horizontally-opposed air-cooled engines providing a top speed of 293 kmh and a range of 1350 km.
Research Piper PA-23
 
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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