Today's Message Index:
----------------------
1. 05:02 AM - Re: Re: Oil temps (A. Dennis Savarese)
2. 05:27 AM - Re: Re: Oil temps (George Coy)
3. 08:29 AM - Re: Oil temps (greg.barnhard@gmail.com)
4. 10:46 AM - Re: Hydraulic brake conversion for a Yak 50? (Bitterlich, Mark G CIV NAVAIR, WD)
5. 11:15 AM - Re: Re: Oil temps (Bitterlich, Mark G CIV NAVAIR, WD)
6. 11:27 AM - Re: Oil temps (Bitterlich, Mark G CIV NAVAIR, WD)
7. 11:32 AM - Re: Oil temps (greg.barnhard@gmail.com)
8. 01:34 PM - Re: [Non-DoD Source] Re: Oil temps (Bitterlich, Mark G CIV NAVAIR, WD)
9. 07:04 PM - Recommendations for yak mechanic in the Memphis area (bmchambers)
10. 11:22 PM - Re: Re: Oil temps (JM)
Message 1
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I'm sure you already know the two probes in the canister are for the front
and rear cockpit.
A suggestion - if you can figure out a way to install an oil temp probe on
the output side of the oil pump/going to the oil cooler, that will give you
some idea of how much temperature drop there is for the oil going through
the oil cooler.Dennis
On Sunday, February 3, 2019, 9:48:30 PM EST, greg.barnhard@gmail.com <g
reg.barnhard@gmail.com> wrote:
mail.com>
All three read oil in from the tank to the engine. The third temp probe is
also mounted in the oil canister where the other two oil temp probes are in
stalled.
Greg
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487424#487424
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Message 2
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Any possibility the temperature bypass in the oil cooler is not working
Sent from my iPhone
> On Feb 4, 2019, at 8:01 AM, A. Dennis Savarese <dsavarese0812@bellsouth.ne
t> wrote:
>
> I'm sure you already know the two probes in the canister are for the front
and rear cockpit.
>
> A suggestion - if you can figure out a way to install an oil temp probe on
the output side of the oil pump/going to the oil cooler, that will give you
some idea of how much temperature drop there is for the oil going through t
he oil cooler.
> Dennis
>
> On Sunday, February 3, 2019, 9:48:30 PM EST, greg.barnhard@gmail.com <greg
.barnhard@gmail.com> wrote:
>
>
mail.com>
>
> All three read oil in from the tank to the engine. The third temp probe is
also mounted in the oil canister where the other two oil temp probes are in
stalled.
>
> Greg
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=487424#487424
>
>
>
>
>
>
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Dennis, I like the idea Im just not sure how feasible that would be. I would like
to do that.
George, as soon as I get home from this trip I plan on pulling the cooler to be
cleaned and inspected.
Do the 52W coolers actually have a thermostat/vernatherm or is it just a basic
bypass valve?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487434#487434
Message 4
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| Subject: | Re: Hydraulic brake conversion for a Yak 50? |
The hydraulic brake conversion for the YAK-50 designed by Les Crowder originally
used a small reservoir on each brake pedal. He also had new axles milled out
which replaced the Russian axles and not a sleeve (for the 50). Les experimented
with a whole slew of ideas for improving both the 50 and 52, and changed
designs several times, so I have no doubt that what you have seen, with a central
reservoir is accurate. He also experimented with new valve covers with
drains on each that allowed oil to go back into the sump when not running, which
then ran to an electric pump that sent all that oil back to the oil tank.
Sometimes known as a "Clean Kit", other versions of this exist that just pump
the oil from the sump back to the tank. He also designed some of the first
early intake tube drain kits. He was a really nice guy, and always a pleasure
to speak with. George Coy was also involved with a lot of this and knew Les
better than I.
Responding to JB, the modification is worthwhile in two ways:
1. You no longer lose air that you will need to start the engine "next time" by
using it up braking the aircraft "this time".
2. Wheel landings in a 50 are relatively easy. Until you need to use any braking
while doing so (using the original system). Les Crowder's design used Cleveland
wheels and brakes of the same ilk used on a Cessna 180. These are powerful
brakes and allow a tremendous amount of braking power when used on a 50,
giving an extremely wide range of control.
Mgb
-----Original Message-----
From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics.com>
On Behalf Of Adrian Hale
Sent: Saturday, February 02, 2019 4:16 PM
Subject: [Non-DoD Source] Re: Yak-List: Hydraulic brake conversion for a Yak 50?
John B I recently sold several brake pedals at auction to Dave Guzman who runs
Southwest Aviation in Tulsa, the pedals were designed by Les Crowder and are on
several Yak 52s. The Aircraft mod is strait forward, with a sleeve on the axle
to accept the Cessna type wheel and brake cylinder, reservoir has been installed
in various places. Yak 52TW mounted it forward of the firewall which I believe
is best, good luck and feel free to contact me if you have questions-Ade
Hale. Tulsa (918/850 9086).
Sent from my iPad
> On Feb 2, 2019, at 7:05 AM, John B <jbsoar@gmail.com> wrote:
>
> Fellow Yak-List contributors:
>
> Can anyone share their experiences with hydraulic brakes on a Yak 50? Are parts
or a kit available to make this conversion? Is the modification worthwhile?
>
> Thank you.
>
> John B
Message 5
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Also out of curiosity, during all this extremely low oil temps going on, what is
the CHT doing? Is it also low, acting normally, or high?
Typically, the oil in any air cooled engine provides about 30% of the cooling.
If the oil temps are in actuality that low, (for the whole engine) then CHT should
be low as well.
What about oil pressure? High, normal, or low?
What I am sure everyone is thinking concerns the replacement of those hoses.
I am just making this up as I go along, but it occurs to me that if the oil *FLOW*
is reduced, the oil cooler will do a much better job of cooling the oil
and oil temperature measured coming out of it might be low. Of course if I happen
to be correct (and again, I am just spit-balling here) reduced engine oil
flow is an extremely bad thing. If correct, I would expect to see low oil temps
due to an obstruction (flapper?) in a hose, *BUT* higher than normal CHT's.
Oil pressure should be impacted as well.
Mark
p.s. Dennis's suggestion is dead on as far as I am concerned. You might also
get some kind of idea of what is going on with a temp gun that you can "aim" and
see temperatures. Usually used to quickly find a missing cylinder as well.
This problem is somewhat worrisome.
-----Original Message-----
From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics.com>
On Behalf Of A. Dennis Savarese
Sent: Monday, February 04, 2019 8:02 AM
Subject: [Non-DoD Source] Re: Yak-List: Re: Oil temps
I'm sure you already know the two probes in the canister are for the front and
rear cockpit.
A suggestion - if you can figure out a way to install an oil temp probe on the
output side of the oil pump/going to the oil cooler, that will give you some idea
of how much temperature drop there is for the oil going through the oil cooler.
Dennis
On Sunday, February 3, 2019, 9:48:30 PM EST, greg.barnhard@gmail.com <greg.barnhard@gmail.com>
wrote:
All three read oil in from the tank to the engine. The third temp probe is also
mounted in the oil canister where the other two oil temp probes are installed.
Greg
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487424#487424
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Message 6
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Good question about the vernatherm. Early YAK-50's had it. It was removed by
a Technical Direction. My 50 did NOT have one installed when I got it, but I
obtained one from a Russian helicopter oil cooler and put it back in. It works
extremely well. I think the Russians were worried about it failing in the
open position, thus by-passing the oil cooler and sending oil temps skyrocketing!
It's a legitimate concern. I have not seen the vernatherm installed in two
other YAK-50's nor two YAK-52's, but that is my total experience, and I have
no clue as to the TW model. I suspect it is NOT installed because of your
description.
Meaning: In my 50, without the vernatherm my oil temps would be low in the winter.
I too would have to use a blockage on the front of the cooler to keep temps
in the green. However WITH the vernaherm installed, oil temps come up much
faster in summer AND winter, and stabilize quickly. They NEVER go out of the
green LOW, but of course will go out of the green high. Interestingly enough,
they do not go out high as fast as they used to. So given your LOW oil temps,
even in the winter BEFORE you did anything, I doubt you have one installed.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics.com>
On Behalf Of greg.barnhard@gmail.com
Sent: Monday, February 04, 2019 11:29 AM
Subject: [Non-DoD Source] Yak-List: Re: Oil temps
--> <greg.barnhard@gmail.com>
Dennis, I like the idea Im just not sure how feasible that would be. I would like
to do that.
George, as soon as I get home from this trip I plan on pulling the cooler to be
cleaned and inspected.
Do the 52W coolers actually have a thermostat/vernatherm or is it just a basic
bypass valve?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487434#487434
Message 7
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Mark,
CHTs and oil pressure are all normal. I dont have any issues controlling the CHTs
as usual. The oil pressure has always been 65psi give or take for as long as
I can remember (and have the data to track).
I changed out the hoses to the cooler to Teflon hoses manufactured by a certified
aviation hose shop. No flappers or imperfections at install or after an inspection.
The hoses are SAE not metric and if I recall correctly the ID on the
SAE hoses are ever so slightly larger than the metric hoses (Im using -12 hoses).
Its a good thought.
I just heard from Cliff and he thinks the bypass valve might be stuck. Cooler is
coming out to get flushed/cleaned. Is Pacific Oil cooler still a good shop to
use?
Thanks,
Greg
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487446#487446
Message 8
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I've heard good things about Pacific Oil.
I don't understand the comment from Cliff about the by-pass valve being
stuck open. That being said, I do have a lot of respect for Cliff and
George Coy! They know this engine much better than myself.
That being said, my point is that the by-pass valve is there in case the
oil cooler fails...as in clogs up.... as in the pressure builds because
of a clogged oil cooler the by-pass valve then opens and the oil
BY-PASSES (!!!) the cooler.
So when the by-pass valve opens, you are operating without an oil
cooler. When it closes, oil flows THROUGH the cooler.
So how would a by-pass valve being stuck open cause COOLER OIL ??? It
should cause MUCH MUCH hotter oil.
I must be missing something here.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
<owner-yak-list-server@matronics.com> On Behalf Of
greg.barnhard@gmail.com
Sent: Monday, February 04, 2019 2:32 PM
Subject: [Non-DoD Source] Yak-List: Re: Oil temps
--> <greg.barnhard@gmail.com>
Mark,
CHTs and oil pressure are all normal. I don=C3=A2=82=AC=84=A2t
have any issues controlling the CHTs as usual. The oil pressure has
always been 65psi give or take for as long as I can remember (and have
the data to track).
I changed out the hoses to the cooler to Teflon hoses manufactured by a
certified aviation hose shop. No flappers or imperfections at install or
after an inspection. The hoses are SAE not metric and if I recall
correctly the ID on the SAE hoses are ever so slightly larger than the
metric hoses (I=C3=A2=82=AC=84=A2m using -12 hoses).
It=C3=A2=82=AC=84=A2s a good thought.
I just heard from Cliff and he thinks the bypass valve might be stuck.
Cooler is coming out to get flushed/cleaned. Is Pacific Oil cooler still
a good shop to use?
Thanks,
Greg
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487446#487446
Message 9
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| Subject: | Recommendations for yak mechanic in the Memphis area |
Looking for a Yak experienced mechanic in the Memphis area. Annual is due next
month. Any recommendations greatly appreciated.
Thanks
Bryan
96 Yak-52
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487449#487449
Message 10
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I have the vernatherm too on my oil cooler.
I concur with Mark: it works very well.
Jan
On 04/02/2019, 20:39, "Bitterlich, Mark G CIV NAVAIR, WD" <owner-yak-list-server@matronics.com
on behalf of mark.bitterlich@navy.mil> wrote:
Good question about the vernatherm. Early YAK-50's had it. It was removed
by a Technical Direction. My 50 did NOT have one installed when I got it, but
I obtained one from a Russian helicopter oil cooler and put it back in. It
works extremely well. I think the Russians were worried about it failing in
the open position, thus by-passing the oil cooler and sending oil temps skyrocketing!
It's a legitimate concern. I have not seen the vernatherm installed
in two other YAK-50's nor two YAK-52's, but that is my total experience, and I
have no clue as to the TW model. I suspect it is NOT installed because of your
description.
Meaning: In my 50, without the vernatherm my oil temps would be low in the
winter. I too would have to use a blockage on the front of the cooler to keep
temps in the green. However WITH the vernaherm installed, oil temps come up
much faster in summer AND winter, and stabilize quickly. They NEVER go out of
the green LOW, but of course will go out of the green high. Interestingly enough,
they do not go out high as fast as they used to. So given your LOW oil
temps, even in the winter BEFORE you did anything, I doubt you have one installed.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics.com>
On Behalf Of greg.barnhard@gmail.com
Sent: Monday, February 04, 2019 11:29 AM
To: yak-list@matronics.com
Subject: [Non-DoD Source] Yak-List: Re: Oil temps
--> <greg.barnhard@gmail.com>
Dennis, I like the idea Im just not sure how feasible that would be. I would
like to do that.
George, as soon as I get home from this trip I plan on pulling the cooler to
be cleaned and inspected.
Do the 52W coolers actually have a thermostat/vernatherm or is it just a basic
bypass valve?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487434#487434
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