Question on Baron 58 prop control

The PT6 engine can be feathered or the blade angle can go to
a reverse setting and the plane can be backed up, as can the
King Air. The prop angle for feathering is about 90 degrees
while normal flight is in the range of 15-45 degrees. Blade
angles less than 15 degrees are called beta and when they
get to 0- [15] degrees they are reverse.

Those numbers are generally correct, but from my memory.
The blade angle is changed when the prop control is pulled
into the reverse range, which is before actually reaching 0
because of forward speed. Pulling the prop control further
spools the engine back into a power range. Reverse is
usually, but not always, locked out in flight. The Pilatus
can be put in reverse in flight as can certain other planes.
But some airplanes that can be reversed in flight are not
safe to do so. A Beech test pilot told me that he had put a
BE E90 in reverse in flight and the airplane did a very fast
flip. On the other hand he also said that the T-tailed King
Airs [f90-200-300] did not do this since the tail was not
blocked by the slipstream. This may or may not be true, it
is just something I was told.
On the ground, dirt ingestion and prop damage are the
limiting factors.



"Doug" wrote in message
oups.com...
| Some seaplane props are featherable and reversable so the
seaplane can
| stop or backup and so the prop can be used as a brake. I
believe the
| Cessna Caravan in Seaplane config can do this, not sure.
|

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.

Jim Macklin wrote:
The Pilatus can be put in reverse in flight as can certain other planes.
But some airplanes that can be reversed in flight are not
safe to do so.

The PC12 POH warns against reversing pitch in-flight. My training
captain beat that into my head when I was first training in the
airplane. There are three situations when reverse should not be used
IIRC. In flight, when the engine is shut down, and ... dammit, can't
remeber the third... back to the books I go : )

"Kingfish" wrote in message
ups.com...

Jim Macklin wrote:
The Pilatus can be put in reverse in flight as can certain other planes.
But some airplanes that can be reversed in flight are not
safe to do so.

The PC12 POH warns against reversing pitch in-flight. My training
captain beat that into my head when I was first training in the
airplane. There are three situations when reverse should not be used
IIRC. In flight, when the engine is shut down, and ... dammit, can't
remeber the third... back to the books I go : )

When there's something behind you?

Barrie

PC 6 high wing STOL bush plane
http://images.google.com/imgres?imgu...LJ:en%26sa%3DN



"Kingfish" wrote in message
ups.com...
|
| Jim Macklin wrote:
| The Pilatus can be put in reverse in flight as can
certain other planes.
| But some airplanes that can be reversed in flight are
not
| safe to do so.
|
| The PC12 POH warns against reversing pitch in-flight. My
training
| captain beat that into my head when I was first training
in the
| airplane. There are three situations when reverse should
not be used
| IIRC. In flight, when the engine is shut down, and ...
dammit, can't
| remeber the third... back to the books I go : )
|

And the Lake "Renagade": amphib can also.... reverse pitch for
stopping and reversing.

Dave


On 27 Nov 2006 15:24:36 -0800, "Doug"
wrote:

Some seaplane props are featherable and reversable so the seaplane can
stop or backup and so the prop can be used as a brake. I believe the
Cessna Caravan in Seaplane config can do this, not sure.

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.

--
Transpose mxsmanic and gmail to reach me by e-mail.

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
--
"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.