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Date: Thu, 28 May 2009 20:42:48 -0400
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From: "Ron Galbraith" <cfi@instructor.net>
Subject: Re: [LML] Re: Engine Out Practise
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Bill,
=A0=A0 When you simulate an engine failure with an IO550, all you need to do
is pull the mixture out.=A0 You can, or should be able to, pull the prop
all the way back too and see how dramatic the difference is in sink
rate.=A0 I've done this many times simulating an engine failure and I've
been asked the question; "ok, fine but what's it really like when you
lose the engine".=A0=A0 Well, when you pull the mixture out, look at the
EGT's.=A0=A0 They are ZERO.=A0=A0 Your engine is not developing any power.=
=A0=A0 Your
engine will still be spinning fast enough to have enough oil pressure to
operate the prop.=A0 I would suggest you do this with an experienced
instructor.=A0=A0

Yes, your prop will go to max fine pitch if you lose oil pressure, just
like having the prop control all the way forward.=A0 The prop governor's
for feathering props operate "backwards" from a standard governor, and
the prop hub is totally different.

Ron


  A few points to consider:

  1. With my IO-550 I can't exercise the (Hartzell) prop below roughly
  1900
  RPM. Nothing happens. If the engine is out there may not be any oil
  pressure
  unless it's windmilling enough to drive the pump and governor.
  Without high
  pressure oil from the governor, my understanding is that the prop is
  designed to go to fine pitch unless it's a feathering or aerobatic
  prop.
  I've been intending to test by setting the prop to coarse pitch then
  shutting down to see where it ended up.

  2. My Navion was originally equipped with a 165-HP engine. The IO-550
  near
  idle probably is comparable to the old E-165 at cruise. I discovered
  this
  one time when I practiced an engine-out for the Commercial test and
  found
  the plane was not descending. We just kept going round and round.
  Turned out
  I hadn't pulled the last fraction of an inch on the throttle.
  How many HP are required to keep a Lancair in the air? The wing
  loading is
  high so speed needs to be kept up but the airframes are very clean. A
  little
  bit of extra power may make a big difference in perceived results.

  I think the only way to really know how a plane will fly engine out
  is to
  actually shut it down. This is one of those things I haven't gotten
  to yet
  but one of these days when I'm feeling brave I'll climb to 10K over
  my
  airport, shut the engine down and see what glide ratio I can get.

  One question: what would be the better way to shut down for easy
  restart?
  Mags or mixture? -Bill Wade


  --
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  http://mail.lancaironline.net:81/lists/lml/List.html

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Bill,<br>&nbsp;&nbsp; When you simulate an engine failure with an IO550, al=
l you need to do is pull the mixture out.&nbsp; You can, or should be able =
to, pull the prop all the way back too and see how dramatic the difference =
is in sink rate.&nbsp; I've done this many times simulating an engine failu=
re and I've been asked the question; "ok, fine but what's it really like wh=
en you lose the engine".&nbsp;&nbsp; Well, when you pull the mixture out, l=
ook at the EGT's.&nbsp;&nbsp; They are ZERO.&nbsp;&nbsp; Your engine is not=
 developing any power.&nbsp;&nbsp; Your engine will still be spinning fast =
enough to have enough oil pressure to operate the prop.&nbsp; I would sugge=
st you do this with an experienced instructor.&nbsp;&nbsp; <br><br>Yes, you=
r prop will go to max fine pitch if you lose oil pressure, just like having=
 the prop control all the way forward.&nbsp; The prop governor's for feathe=
ring props operate "backwards" from a standard governor, and the prop hub i=
s totally different.<br><br>Ron<br>
<br><blockquote style=3D"border-left: 2px solid rgb(16, 16, 255); margin-le=
ft: 5px; padding-left: 5px;"><br>

<br>
  A few points to consider:<br>
<br>
1. With my IO-550 I can't exercise the (Hartzell) prop below roughly 1900 <=
br>
RPM. Nothing happens. If the engine is out there may not be any oil=20
pressure <br>
unless it's windmilling enough to drive the pump and governor.=20
Without high <br>
pressure oil from the governor, my understanding is that the prop is <br>
designed to go to fine pitch unless it's a feathering or aerobatic prop. <b=
r>
I've been intending to test by setting the prop to coarse pitch then <br>
shutting down to see where it ended up.<br>
<br>
2. My Navion was originally equipped with a 165-HP engine. The=20
IO-550 near <br>
idle probably is comparable to the old E-165 at cruise. I discovered this <=
br>
one time when I practiced an engine-out for the Commercial test and found <=
br>
the plane was not descending. We just kept going round and round.=20
Turned out <br>
I hadn't pulled the last fraction of an inch on the throttle.<br>
How many HP are required to keep a Lancair in the air? The wing=20
loading is <br>
high so speed needs to be kept up but the airframes are very clean.=20
A little <br>
bit of extra power may make a big difference in perceived results.<br>
<br>
  I think the only way to really know how a plane will fly engine=20
out is to <br>
actually shut it down. This is one of those things I haven't gotten=20
to yet <br>
but one of these days when I'm feeling brave I'll climb to 10K over my <br>
airport, shut the engine down and see what glide ratio I can get.<br>
<br>
  One question: what would be the better way to shut down for easy=20
restart? <br>
Mags or mixture?  -Bill Wade<br>
<br>
<br>
--<br>
For archives and unsub=20
http://mail.lancaironline.net:81/lists/lml/List.html<br>
<br>
</blockquote><BR>

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