Each power section has a free turbine (compressor coupled to turbine wheel) to generate the high heat gas that powers a seperate power turbine wheel which drives the combining gearbox. This arrangement is the "fluid clutch". Also, inside the combining gearbox at each power section is a freewheeling unit (Sprage clutch) that disengages a power section power turbine wheel in the event of power section failure. Not common, but unfortunatly, it does happen. With one power section inop, the other can put out 1050 shp for a short period, but will not sustain level flight with a high gross weight.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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