Differentially geared reversible fan for ducted fan gas turbine

Details Differentially geared reversible fan for ducted fan gas turbine Differentially geared reversible fan for ducted fan gas turbine

1975-09-03

1977-02-01

Freeh, William L.

Power plants

Reaction motor

Interrelated reaction motors

60268, 60 3916C, 417315, 417408, 415 61, F02K 304, F02C 306

Patent

active

040055752

ABSTRACT:
A ducted fan gas turbine engine comprises a pair of turbines in flow series which are contra-rotating and which drive shafts which in turn drive into an epicyclic gear. The output from the epicyclic gear drives a fan which normally provides forward thrust from the engine. The fan can be made to rotate in the opposite direction to provide reverse thrust by varying the relative speeds of rotation of the two turbines by bleeding working fluid from between them.

REFERENCES:
patent: 2423183 (1947-07-01), Forsyth
patent: 2599058 (1952-06-01), Johansen et al.
patent: 2619797 (1952-12-01), Haworth
patent: 3507113 (1970-04-01), Herrmann et al.
patent: 3729957 (1973-05-01), Petrie et al.
patent: 3861139 (1975-01-01), Jones

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