Today's Message Index:
----------------------
1. 01:10 AM - Re: strange behaviour pressure gauge (Jan Mevis)
2. 08:40 AM - Re: Newbie... (Terry Calloway)
3. 08:40 AM - Need exhaust (Terry Calloway)
4. 09:40 AM - Re: Need exhaust (doug sapp)
5. 09:46 AM - CJ6 engine mount (David Sproule)
6. 09:49 AM - Re: Need exhaust (Jim Selby)
Message 1
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| Subject: | strange behaviour pressure gauge |
The ambient temperature of the hangar with the Yak 50 and the Yak 52 is
at 2 degrees Celsius now for a couple of days. We also heated the
cockpit with a small heat gun. After depleting the pressure lines, the
main pressure indicator still kept indicating 110 kg / cm=C2=B2 on the
52 and 90 kg/cm=C2=B2 on the 50. When taking out the pressure gauges
(relatively easy: only unscrew one bolt right above in the panel, the
one that does not have a =9Ccross=9D; this bolt opens up a
large ring at the inside of the panel; this ring clamps the instrument;
when opened up, you can push the instrument out of the panel =93
SLOWLY =93 and deconnect the pressure lines), so when taking out
the gauges and deconnecting the lines, quite some water came out of the
lines. But without pressure, the main gauge still was at 60 kg/cm=C2=B2.
This means that the main pressure of the 52 was 50 kg/cm=C2=B2 and only
30 kg/cm=C2=B2 on the 50. Normal situation.
So we opened up the instrument. A very tiny tube goes from the orifice
to a kind of half-circular box. This half circle stretches by the air
pressure, and thus operates a tiny needle indicator system. It looks
quite fragile, just as in the inside of a swiss watch. There are two
half circular boxes, one for the main and one for the emergency
pressure. But only the emergency can be =9Cset=9D by two of
the four screws that hold the instrument housing. Two of the four bolts
are longer. For the main indicator, the only way =93 I suppose -
to set it to zero again, is by gently pushing on the half circular box
until the needle is at zero again.
We already mounted the pressure gauge back into the Yak 52, and did
about 30 kg / cm=C2=B2 pressure in the aircraft. Now we=99ll wait
for a few days to see if it remains constant.
This is probably not the correct procedure to reset the gauge. Probably
the instrument needs to be overhauled.
All the best,
Jan Mevis
YK50 RA2005K
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Jan Mevis
Sent: maandag 12 januari 2009 18:09
Subject: RE: Yak-List: strange behaviour pressure gauge
Thank you all for the ideas.
So, the different possibilities:
- Frozen water in the lines; if that is the case, the problem
should disappear after warming up the aircraft (we=99ll put a
small bathroom heater with thermostate inside the cockpits to check,
since it is still way too cold here);
- An obstruction at the entrance of the gauges; if the first
option does not work, we=99ll take the gauges out to verify the
orifice at the entrance;
- Gauges severely damaged in one way or another (apparently
they have seen cracked up gauges in Russia in times of extreme cold) ,
in which case they have to be replaced.
As soon as I have a conclusive result, I=99ll inform the list. It
will be interesting to see if both the Yak 50 and the Yak 52 have the
same diagnosis.
Jan Mevis
YK50 RA2005K
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of
nc69666@aol.com
Sent: maandag 12 januari 2009 17:03
Subject: Re: Yak-List: strange behaviour pressure gauge
Remove the pressure gauge and check the orface where the air pressure
enters the instrument, I had a similular occurance on my CJ, I found the
opening with a small amount of corrision in the opening, It is made of
brass.. What I did was to take a very fine probe and worked the blockage
out ot the opening, there was some pressure trapped in the instrument so
when I loosened the obstruction, the pressure in the gauge blew the
debris out of the opening.. It has worked fine ever since..
Gary CJ N22YK
-----Original Message-----
From: Jan Mevis <jan.mevis@informavia.be>
Sent: Sun, 11 Jan 2009 9:50 pm
Subject: Yak-List: strange behaviour pressure gauge
We=99ve had some unusually cold weather here in Western Europe
(-20 degrees celsius in Namur, Belgium). I don=99t know if
there=99s any correlation, but the needle of the main pressure
gauge in my Yak 50 is now in the other half of the instrument (at the
side of the emergency pressure indicator) at about two o=99clock.
Emergency pressure is still at the normal 60 kg/cm=C2=B2. The aircraft
was last flown at the end of december 2008, just before the extremely
cold weather. And at that time everything was normal.
I have depleted the main pressure system completely. The needle moved
back to the left a little, and stopped at about 11 o=99clock. The
amount of motion to the left of the needle when depleting could
correspond with a presence of about 30 kg/cm=C2=B2 in the main circuit
(quite normal in my Yak 50 after some time).
I charged again until I heard the relief valve. I know that this
corresponds with 50 kg/cm=C2=B2, but the needle of the main pressure
was again at two o=99clock.
Of course the instrument may be broken, but even stranger: in the same
hangar we have a Yak 52 WITH EXACTLY THE SAME PHENOMENON. In this 52,
the needle of the main pressure is also at about two o=99clock.
Although the pressure on this aircraft must have been relatively normal,
because we could start it without difficulties.
Has anyone seen this before ?
Jan Mevis
Yak 50
RA2005K
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Message 2
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Hi Bill,
Great to see we finally converted you.
Check with Keith Harbour at Avcraft in Nebraska. He will likely have
what you are looking for.
tc
On Jan 16, 2009, at 12:15 PM, Bill VonDane wrote:
> I just wanted to introduce myself as a new Yak 52 owner... I used
> to fly an RV-8A that I built but recently traded it for the
> Yak.....and actually am in need of a check valve for my E-air system
> if any has one or knows where I can get one...
>
> Thanks!
>
> -Bill VonDane
> www.vondane.com
>
> ps... I'm in Colorado at Meadow Lake Airport - 00V, and my business
> is instrument panel design, CAD, cutting, and building for
> experimentals - www.whiskeyvictor.com...
>
>
Message 3
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Hi Gang,
I am in the middle of swapping from the Housai to M14P and I am
looking for an exhaust to work on the Nanchang with the M14. I would
like one with a heater if possible and would also prefer an exhaust
with slip joints. Any assistance in helping me locate on would be
greatly appreciated.
I have some parts for sale which I will no longer need including the
SS exhaust with heater from the Housai AND and M14 Carburetor since I
will be using the fuel injection.
Contact me at 620-875-9450 or the email shown.
Thanks;
Pumper
Message 4
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| Subject: | Re: Need exhaust |
Terry,
Unless there is some reason why you don't prefer to use the 285 hp exhaust
system why don't you just change the nuts and install it on your M14P?
Always Yakin,
Doug
On Sun, Jan 18, 2009 at 8:35 AM, Terry Calloway <terrycalloway@mac.com>wrote:
>
> Hi Gang,
> I am in the middle of swapping from the Housai to M14P and I am looking for
> an exhaust to work on the Nanchang with the M14. I would like one with a
> heater if possible and would also prefer an exhaust with slip joints. Any
> assistance in helping me locate on would be greatly appreciated.
>
> I have some parts for sale which I will no longer need including the SS
> exhaust with heater from the Housai AND and M14 Carburetor since I will be
> using the fuel injection.
>
> Contact me at 620-875-9450 or the email shown.
>
> Thanks;
> Pumper
>
>
--
Always Yakin,
Doug Sapp
Phone 509-826-4610
Fax 509-826-3644
Message 5
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| Subject: | CJ6 engine mount |
Hello All,
I am looking for an UNservicable engine mount to build a rotisserie for the
CJ. Any information or suggestions appreciated. Thanks you.
Best regards,
David Sproule
Message 6
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| Subject: | Re: Need exhaust |
Pumper,
Try these guys:
www.aircraftexhaust.net
1-800-770-7287 Richard
Princeton, MN
----- Original Message -----
From: "Terry Calloway" <terrycalloway@mac.com>
Sent: Sunday, January 18, 2009 8:35 AM
Subject: Yak-List: Need exhaust
>
> Hi Gang,
> I am in the middle of swapping from the Housai to M14P and I am
> looking for an exhaust to work on the Nanchang with the M14. I would
> like one with a heater if possible and would also prefer an exhaust
> with slip joints. Any assistance in helping me locate on would be
> greatly appreciated.
>
> I have some parts for sale which I will no longer need including the
> SS exhaust with heater from the Housai AND and M14 Carburetor since I
> will be using the fuel injection.
>
> Contact me at 620-875-9450 or the email shown.
>
> Thanks;
> Pumper
>
>
>
>
>
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