Today's Message Index:
----------------------
1. 01:15 AM - Re: Hydraulic Lock (Elmar & Manuela Hegenauer)
2. 01:55 AM - Re: Re: Hydraulic Lock (Richard Goode)
3. 02:33 AM - Re: Hydraulic lock? (Wim)
4. 03:43 AM - Re: Yak-List Digest: 33 Msgs - 04/19/13 (SRGraham)
5. 07:07 AM - Intake drain kit (Kelley Monroe)
6. 08:38 AM - Re: Intake drain kit (Thomas McKeon)
7. 09:31 AM - Re: Re: Hydraulic Lock (ade hale)
8. 10:58 AM - Another Hydraulic lock tip (Cpayne)
9. 01:16 PM - Re: Intake drain kit (Roger Kemp M.D.)
Message 1
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| Subject: | Re: Hydraulic Lock |
The other day someone told me that
one actually can bend a rod on those
radials by just using the air start system
with the magnetos in off position and the
booster coil disconnected.
I doubt it very much that the air pressure
alone will have enough energy to damage
the engine in the event of a hydraulic lock,
the prop will merely stop turning.
Just my 2 cents.
cheers
Elmar
Message 2
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| Subject: | Re: Hydraulic Lock |
I would be very sure that you can bend a rod just with the air start, as
long as the engine has built up a little momentum. I have heard it said that
you can also do it by pulling the propeller through by hand, but this I
personally doubt, and I have never heard of an actual case where it has been
done!
Richard Goode
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +94 (0) 81 241 5137 (Sri Lanka)
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
Im currently in Sri Lanka but this Mail is working,and my local phone is
+94 779 132 160.
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Elmar & Manuela
Hegenauer
Sent: Sunday, April 21, 2013 1:42 PM
Subject: Yak-List: Re: Hydraulic Lock
--> <samira.h@shaw.ca>
The other day someone told me that
one actually can bend a rod on those
radials by just using the air start system with the magnetos in off position
and the booster coil disconnected.
I doubt it very much that the air pressure alone will have enough energy to
damage the engine in the event of a hydraulic lock, the prop will merely
stop turning.
Just my 2 cents.
cheers
Elmar
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Message 3
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| Subject: | Re: Hydraulic lock? |
Also not mentioned before in this thread:
On our Yak-52; we have installed a shut off valve just below the oil tank. This
valve is closed after each flight to prevent oil draining into the engine when
parked. When closed it flicks a switch that disables the ignition system to
prevent starting. Not sure if this easy modification is common or will prevent
all hyd lock issues caused by oil, but seems logical to me.
Rgds
Wim
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399029#399029
Message 4
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| Subject: | RE: Yak-List Digest: 33 Msgs - 04/19/13 |
RE: our beloved M14 & Housani engines and their idiosyncrasies
Dear ALL
I have a standard M14 P in my Yak18T to which we have fitted the
intake drains.
We noted the sludging of oil previously mentioned in the list, particularly
in winter & observed the gradual clearing of fuel colour noted by Mark &
others on the list. This washing out of the intakes is now SOP. It also
seems to work better with a pilot(my wife) priming the engine whilst I turn
the blades, I'd guess the spinning supercharger impellor is helping??
We have recently fitted sump oil heaters to all 3 aircraft, M14P(sump & oil
tank), Lyc IO 360 & 0 320. Winter is not yet fully here but the results
have been thus far impressive.
Oil sits at about 30-35 deg C in all engines, cylinder temps between 25-35
deg C in all engines. We have cowl covers on all & overnight temps to date
are -1 de C
The oil drain from the M14 has been a little more obvious but the big
changes are no thick oil at all, rapid clearing of the intake drain to clear
avgas & oil temp to 40 deg C within 5-7 min at ambient of 0 to 7 degC. Prior
experience was that it took about 20 minutes to be ready for taxi. All
engines now warm very quickly, so far in less than 10 minutes all 3 are
ready to launch.
Will report mid winter, where we expect ambient to be below 0 deg C most
nights for 2-3 months.
I have a question re CHTs in the M14 P. We have fitted a digital cht gauge,
expecting the worst but the results so far have been rather lower than
expected. At TO(95% & WOT) & climb(80% & 800mm MP) gills wide open, 105-7
kn, 500f/min cruise climb the top 2 cylinders run about 190 C, the lowest 2
run 160 deg C. At cruise setting to achieve 180 HP at 6000-10000 ft i have
to almost completely shut the gills, run the carby heat all the time
(ambient typically 5 to -5 deg C) but the lowest 2 run hottest, usually 160
with the top 2 only just staying at 130 deg C.I understood the spread was
from lean mix at the top but why the reverse at cruise?
So any explainations re chts??
Cheers
Stewart Graham, Tasmania Australia
Message 5
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| Subject: | Intake drain kit |
With all the chatter about intake drains I am going to install them on
my CJ. Does anyone make a kit for the Housai?
Message 6
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| Subject: | Re: Intake drain kit |
I just ordered an intake kit from Worldwidewarbirds.com
They have a picture on their parts section. I'm not sure if anyone else make
s them but I'd be interested to know.
Tom
Sent from my iPhone
On Apr 21, 2013, at 9:09 AM, "Kelley Monroe" <kelmonroe@comcast.net> wrote:
> With all the chatter about intake drains I am going to install them on my C
J. Does anyone make a kit for the Housai?
>
>
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>
Message 7
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| Subject: | Re: Hydraulic Lock |
elmar--you are incorrect--if you determine the area of the piston it is around
12 square inches--the air pressure is 50 to 70 atmospheres, so you get over 7000
pounds of pressure on the rod----It will bend!
On Apr 21, 2013, at 3:11 AM, Elmar & Manuela Hegenauer wrote:
>
> The other day someone told me that
> one actually can bend a rod on those
> radials by just using the air start system
> with the magnetos in off position and the
> booster coil disconnected.
>
> I doubt it very much that the air pressure
> alone will have enough energy to damage
> the engine in the event of a hydraulic lock,
> the prop will merely stop turning.
>
> Just my 2 cents.
>
> cheers
>
> Elmar
>
>
>
>
>
Message 8
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| Subject: | Another Hydraulic lock tip |
With the prop stopped at or near TDC on #1 cylinder, all the lower pistons (and
rings) are close to BDC while the upper cylinders are near the top of their stroke.
Does not matter whether compression stroke or not.
This position works to minimize drain down for both short and especially long term
storage. All other precautions as described in the manuals should be taken
as well for longer term storage.
For the M-14P series I engines and Huosai engines, I would remove the front plug
on #5 and then use a wooden or AL rod to find Bottom Dead Center on #5. Doing
so means #1 will be Close to it's TDC position. For M-14P Series II engines
I have an quicker solution on my web site.
And as a note, I always pull through the primed cylinders (Mags off!) and open
my intake drain kit before a start. My thought is that there may be a *lot* of
engines out there with link pins that have been stressed at one time or another.
Doesn't mean that they are going to fail but perhaps some day during a start
when another slug of oil is in the wrong place at the wrong time.
Craig Payne
Message 9
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| Subject: | Re: Intake drain kit |
Kimble aviation makes them aso. Particularly for the M14.
Doc
Sent from my iPad
On Apr 21, 2013, at 10:35 AM, Thomas McKeon <tmckeon79@hotmail.com> wrote:
> I just ordered an intake kit from Worldwidewarbirds.com
> They have a picture on their parts section. I'm not sure if anyone else ma
kes them but I'd be interested to know.
>
> Tom
>
> Sent from my iPhone
>
> On Apr 21, 2013, at 9:09 AM, "Kelley Monroe" <kelmonroe@comcast.net> wrote
:
>
>> With all the chatter about intake drains I am going to install them on my
CJ. Does anyone make a kit for the Housai?
>
>
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>
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