Question on Baron 58 prop control

Robert M. Gary writes:

I can't imagine how/why you would feather the prop with the engine
still running.

Neither can I, but I was wondering if it would hurt anything.

Certainly not something I have or would try. On most all
planes pulling the prop level all the way back feathers them. On some
older planes there was a feather button but nothing I've flown (DC-3,
etc)

There's a red button on the sim, but it doesn't appear to be fully
simulated. It's the "minus" settings of the prop that puzzle me.

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Allen writes:

As Jim said the PW PT6 engine has no physical connection between the power
section and the drive section.

How does power get from one to the other?

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TheSmokingGnu writes:

Yes, and yes. There is a procedure to check the prop speed mechanism
during run-up to briefly move the prop lever through it's travel.
Intentionally running a prop to feather on an engine doesn't do it any
good, however, and if it gets slow enough, the engine can stall, or
heaven forbid the lock pins can fall in place (and then you're really
FUBAR'd, time for a mechanic). On a (free-turning) turboprop, it's less
of a concern, although I imagine the turbine guys won't thank you for it
if you do it too often.

Thanks. Another thing that confuses me is: Is a feathered prop
always edge to the wind, or flat to the wind, or does it vary by
aircraft? Edge to the wind would minimize drag on the aircraft, but
flat to the wind would minimize drag on the engine.

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Is a feathered prop
always edge to the wind, or flat to the wind, or does it vary by
aircraft? Edge to the wind would minimize drag on the aircraft, but
flat to the wind would minimize drag on the engine.

Feathered is edge to the wind. The other is called "flat pitch".

Jose
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"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
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Mxsmanic wrote:
How does power get from one to the other?


The turbine's output over a second series of fan blades, which are
connected to the propeller shaft. In effect, it's a giant torque
converter (if you're at all familiar with car technology).

In fact, you can hold, with your bare hand, the prop blade during start
up. Just don't let go of it, and don't try to catch it if it comes
loose! (Oh, and RUN!)

Is a feathered prop
always edge to the wind, or flat to the wind

Edge to the wind. The thought is that the engine has already failed in
some capacity, and a windmilling prop causes massive cavitation and
drag, so the blade edge is aligned with the relative wind to stop it
from turning (although not fully, due to mechanical positioning issues,
they get really, really close).

MT Propeller has a reversable prop the experimental guys put on Super
Cubs and that sort of plane. It is MOST useful with a Seaplane and can
be reversed on landing. It can't be reversed when you are over 1400 rpm
or some such and cant be reversed in the air. Both Beta (feather) and
reverse would be very useful in a Seaplane.

"TheSmokingGnu" wrote in message
...
Mxsmanic wrote:
How does power get from one to the other?


The turbine's output over a second series of fan blades, which are
connected to the propeller shaft. In effect, it's a giant torque converter
(if you're at all familiar with car technology).


Interesting. Is that what gave rise to the old slang term "Propjet"?

How does this compare with the present form of propulsion, such as in the
B747, which I've heard being called "Fanjet"? Is it the same but turbine
blades replace propellor blades while serving a similar function?

Barrie

The "minus' button if what you push when you are in full speed cruise
:-) (Try it and see what happens!)

Nice thing about a sim, you can do stuff you CANT do on a real
airplane (like crash).

And that is why a sim will NEVER be like true flight. With a sim, if
you crash, you crashed and you are ok. With a real airplane, you
crashed, and that's IT! No more you. A different headspace, attitude,
whatever you want to call it.

"Mxsmanic" wrote in message
...
Allen writes:

As Jim said the PW PT6 engine has no physical connection between the
power
section and the drive section.

How does power get from one to the other?

air pressure

"Doug" wrote in message
oups.com...
The "minus' button if what you push when you are in full speed cruise
:-) (Try it and see what happens!)

Nice thing about a sim, you can do stuff you CANT do on a real
airplane (like crash).

And that is why a sim will NEVER be like true flight. With a sim, if
you crash, you crashed and you are ok. With a real airplane, you
crashed, and that's IT! No more you. A different headspace, attitude,
whatever you want to call it.


That echoes what I said when trying to explain what FS is to someone today.
That it's ultra-realistic but the big thing that's missing is any "fear
factor". If that was present, which of course it can't be, then our
decisions while simming would of course be very different.

Barrie