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Aviation History
1954
1954 - 1042.PDF
c (—r~j—r~^" 9 APRIL 1954 The Free Turbine Engine The only drive coupling between the propeller and the power-section of a free- turbine engine such as the Proteus is the gas stream. Because of this, starting is easy (the engine can be started with the propeller feathered) and control is much simplified. As they are not mechanically coupled, the propeller and the power section can each operate at their optimum conditions, and thus cruising altitude can be widely varied whilst still maintaining an unusually low specific fuel consumption. In addition, the windmilling drag is scarcely higher than that of a feathered propeller and aircraft control in the asymmetric case is thereby greatly eased. mw&mmi
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