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Old 22nd Feb 2017, 01:41
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barit1
 
Join Date: Feb 2005
Location: flyover country USA
Age: 78
Posts: 4,580
If it's a recip engine, unfeathering the prop usually creates enough torque to restart the engine, provided it is not badly damaged. Think of a rolling start with a clutch and manual transmission in a car or truck.

Single shaft turbines can also be restarted this way, because th prop torque is directly coupled to the compressor rotor. With a two- or three-shaft machine, no such luck, although the engine starter may be used.
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