![]() The lack of suitable piston engines, however, was a major factor in the failure of Pipers own Fat Albert, the Pocono. Piper management was slow to accept the turboprop engine some members of the Piper family were said to be set against it. Pratt & Whitney of Canada PT6 engines power all but the 400LS, which uses Garrett (now Allied Signal Engines) TPE-331s. These are the PA-31T series, or Cheyenne/II, Cheyenne I/IA and Cheyenne IIXL (plus an unpressurized hybrid developed for the air taxi and commuter markets, the PA-31T3 or T-1040) and the PA-42 series, which consists of the T-tailed and longer-fuselage Cheyenne III/IIIA and Cheyenne IV/400LS. There are two major branches to the design family. All share a common heritage: the basic PA-31 design originally introduced as the Navajo. There are five basic Piper Cheyenne models. Designed to provide a lot of performance for a comparably low price, the much-maligned Cheyenne still is a relative bargain for the kerosene crowd.
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