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Date: Mon, 20 Jun 2011 19:55:18 -0400
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Subject: Re: [LML] Re: And how about a full feathering prop?
From: Colyn Case <colyncase@earthlink.net>
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Barry,   I have the same prop.  I'll have to check the governor when I =
get home.
Your description does not match the behavior of my installation.
I can get it to feather with the prop control.  Once there and prop =
stopped it takes about 20 secs of cranking to get it out of feather.

I would like to understand the prop lock a little better.    How does it =
interact with oil pressure, for example?
If my prop is still windmilling at 1000 rpm will I be able to get it =
into feather?

Maybe someone on the list knows.

Colyn

On Jun 20, 2011, at 5:00 AM, F. Barry Knotts wrote:

> Jeff,
> I think I have the same full feathering Hartzell prop on my IV-P =
(HC-H3YF-2UF).   The governor is a McCauley #DCF290D7X/T3.  I can =
control the speed, but I can't feather this prop with the prop control.  =
I was told at one time that this prop is designed for racing and it only =
will go to full feather if two things occur simultaneously; loss of oil =
pressure and RPM above 1200.  Then it locks in feather and you do =
whatever you need to do to get on the ground.  The only way to unfeather =
it at that point requires attaining 1200 RPM WITH oil pressure.  Tough =
to do with the starter, the engine must start and produce oil =
pressure...while feathered.
>=20
> These two things conditions for feathering should only occur together =
if you have a catastrophic loss of oil pressure with a windmilling prop =
(or driven).  Otherwise, you would have the prop feather every time you =
shut the engine down.
>=20
> So my question is:  How did you get it to feather?  Do you have a =
different prop governor?  I called Hartzell once and they said that they =
did not have a recommended governor for the prop.  (That seemed a little =
strange.)
>=20
> Inquiring minds....
>=20
> Barry Knotts
> Lancair IV-P, N4XE
>=20
> On 6/19/2011 11:30 AM, liegner@earthlink.net wrote:
>> I have practiced engine out glide with my full feather three blade
>> Hartzell prop (Model number HC-H3YF-2UF) in the full feather position
>> and fully stopped.
>=20
>=20
> --
> For archives and unsub =
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