Windmilling and electrical power

Mxsmanic wrote:
If a prop is feathered and an engine is shut down, will the engine
windmill at all?

I assume that a windmilling prop still turns the engine (i.e., no
clutch disconnects it from the engine, at least on a piston
powerplant). If so, can windmilling drive an alternator enough to
provide useful electrical power?

You'll never know until you get into a plane. A real plane. your
question... Some will. Some won't. Again, stop cross posting. At best,
you're a student. At worst, you're not even human.

Rip

Do you know the difference between a windmilling prop and one that is
feathered? Try looking this up first before wasting more electrons.

Viperdoc writes:

Do you know the difference between a windmilling prop and one that is
feathered?

Yes. I also know that not all props have adjustable pitch, and that
the fully feathered position on a prop will not necessarily be exactly
parallel to the wind.

I suppose the question can apply to jet engines as well, but someone I
doubt that they would windmill with speed sufficient to generate
useful power, and I'm not sure which stage of the engine drives
generators, anyway.

Obviously windmilling itself is practical, since some aircraft have a
tiny deployable windmill specifically for this purpose.

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On Feb 6, 7:53 pm, Mxsmanic wrote:
Yes. I also know that not all props have adjustable pitch, and that
the fully feathered position on a prop will not necessarily be exactly
parallel to the wind.

Sorry everyone but I am gonna feed the troll here.Most of the props
that I have seen fethered are actually feathered enough to stop or
spin very slowly.

I suppose the question can apply to jet engines as well, but someone I
doubt that they would windmill with speed sufficient to generate
useful power, and I'm not sure which stage of the engine drives
generators, anyway.

Not sure what you are asking here, but a jet engine will not
feather .The fan blades are not adjustable.The compressor section
drives the generator, but it will not spin fast enough to generate
electricity (Even with a CSD).What is interesting is that it will
indicate oil pressure and with this indication (And the absence of
vibration) a restart is recomended.

Obviously windmilling itself is practical, since some aircraft have a
tiny deployable windmill specifically for this purpose.

All of the ER versions of 2 engine transport category jets have this
function.

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Sorry about feeding the troll guys, but he ask a question that I
actually knew something about.

What is interesting is that
it will
indicate oil pressure and with this indication (And the absence of
vibration) a restart is recomended.


That is interesting and usefull, although I'll never personally have
any occasion to use it.

Rip writes:

You'll never know until you get into a plane.

Oh, I think someone who knows the answer will eventually tell me. I
have to put up with a bit of background noise, but there are still a
few qualified and sensible people on these newsgroups.

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