Just to add to the total thread, for the uninitiated, a
constant speed prop isn't really constant, the blade angle
is hunting back and forth to adjust for varied aerodynamic
loads. So, once the plane is warm and in operation, oil in
the prop dome generally stays plenty warm. But if you are
flying a multiengine aircraft in cold weather and shut an
engine down in training including feathering, the oil may
congeal to the point the prop won't unfeather. So ME CFI be
careful what and where you practice.

I look forward to winning the lottery and buying you a
drink.

Jim
"Dudley Henriques" wrote in
message
link.net...
| I've done this a few times myself. :-)
| On Usenet, if you underpost someone already in the thread
but NOT the
| original poster, what you post is considered addressed to
the person you
| underposted rather than simply an addition to the general
thread.
| Any general comment should be picked up as a post to the
original poster by
| clicking his/her post for reply. Then the comment appears
referenced to the
| initial question and not the sub poster.
| I did the same thing once and gave a hundred word
"lecture" on how to do a
| slow roll to one of the world's best acro pilots by
accidentally picking him
| up to underpost instead of the initial poster who had
asked about rolls. :-)
| The pilot I gave the lecture to simply gave me a one word
reply "Thanks"
| with a smilie attached :-)
| That get together sounds like fun. I'll bring the bottle!
| Dudley
|
|
|
| "Jim Macklin" wrote
in message
| news:nZT2g.6827$ZW3.3603@dukeread04...
| No, I know that, I just tacked it on the thread for the
| benefit of the others. I think most pilots and many
| mechanics don't really understand these things, judging
by
| the number of twins that feather before the prop lever
gets
| to the gate.
|
| If I win the lottery, odds 146 million to one, we can
have
| that CFI round table and sell tickets to anyone without
a
| CFI. CFIs can come for free. I'll pay for you and me.
If I
| don't win the lottery, it will have to be in Wichita,
can't
| afford to go elsewhere without the lottery. ;-)'
|
| --
| James H. Macklin
| ATP,CFI,A&P
|
| --
| The people think the Constitution protects their rights;
| But government sees it as an obstacle to be overcome.
| some support
| http://www.usdoj.gov/olc/secondamendment2.htm
| See http://www.fija.org/ more about your rights and
duties.
|
|
| "Dudley Henriques" wrote in
| message
|
nk.net...
| | If all this was meant for me, I'm pretty sure I just
| might already know
| | these things
| | :-)
| | Dudley Henriques
| |
| | "Jim Macklin"
wrote
| in message
| | news:yZS2g.6789$ZW3.6526@dukeread04...
| | The prop governor controls within a range and should
| hold a
| | steady rpm within that range. When the run-up is
done
| at
| | say, 2400 rpm the prop should be cycled to the
minimum
| rpm
| | and allowed to stabilize for a few seconds to check
that
| the
| | governor is working properly. On a multiengine
airplane
| the
| | prop should be reduced to just outside the feather
| detent
| | and allowed to run for several seconds to be sure
that
| the
| | prop isn't feathering at the minimum governed speed
| [usually
| | 2000 rpm on most piston engines]. If the prop
control
| is
| | not rigged properly the prop will feather too soon.
| Then
| | the prop feather check should be done.
| |
| | Most props have a certain amount of internal leakage
to
| keep
| | warm oil circulating in the prop hub, but several
cycles
| on
| | a cold engine/prop will assure that the prop does
reach
| | proper operating temperatures.
| |
| | In very cold temperatures, I like to vary the rpm
every
| some
| | often to be sure the prop is functioning, but normal
| | internal flow should make this mostly an unneeded
habit.
| |
| | Remember, on a single-engine reducing rpm send oil
to
| the
| | prop and on a multi, reducing rpm/feathering drain
oil
| from
| | the prop.
| |
| |
| | --
| | James H. Macklin
| | ATP,CFI,A&P
| |
| | --
| | The people think the Constitution protects their
rights;
| | But government sees it as an obstacle to be
overcome.
| | some support
| | http://www.usdoj.gov/olc/secondamendment2.htm
| | See http://www.fija.org/ more about your rights and
| duties.
| |
| |
| | "Dudley Henriques" wrote
in
| | message
| |
|
ink.net...
| | |
| | | "Frode Berg" wrote in
message
| | | ...
| | | Hi!
| | |
| | | I was told by my mechanic to only pull the prop
| handle
| | until I could
| | | audibly
| | | hear a slight pitch change to establish that it
was
| | working.
| | |
| | | However, the aircraft manual says it should be
| cycled
| | completely, and on a
| | | cold engine three times to make sure oil is
applied
| to
| | the governor, or
| | | the
| | | pitch mechanism.
| | |
| | | Can someone elaborate on this?
| | |
| | | What is recommended?
| | |
| | | Thanks,
| | |
| | | Frode
| | |
| | | POH rules of course, but aside from that, I always
| liked
| | to exercise a prop
| | | through several cycles, especially when cold, just
to
| get
| | everything nice
| | | and warm and fluid up there.
| | | Dudley Henriques
| | |
| | |
| |
| |
| |
| |
|
|
|
|