Today's Message Index:
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1. 07:01 AM - Re: Carb discussion and canopy seal (Richard Goode)
2. 07:11 AM - Re: Carb discussion and canopy seal (jay-dub)
3. 01:39 PM - Re: Carb discussion and canopy seal (Peter Scott)
4. 06:23 PM - Re: Carb discussion and canopy seal (motoadve)
Message 1
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| Subject: | Carb discussion and canopy seal |
Certainly. The pilot was flying an aerobatic routine in France when he
recounted (subsequently) that the engine missed and then recovered, but over
about 10 minutes it became worse and worse and then finally the engine was
hardly delivering any power at all, hence his doing an emergency
forced-landing in a field, where the propeller hit the ground, hence causing
the need for a shock-load inspection, which we have to do in Europe.
We sent the engine to Aerometal in Hungary, and I said to them that, from my
experience, the issue sounded rather like a coil problem. However they
dismantled the engine; no problems at all; reassembled it and then, as is
our usual practice, put it on the dynamometer to test it. However it
wouldn't start, and after a bit, Aerometal realised there was a carburettor
problem; dismantled it; found a "tear" in the membrane; replaced it and the
engine ran perfectly.
I have asked them if they can find the old membrane and give me a photograph
of it. If I do get one, of course I will publish it.
But, I certainly know of another three membrane failures, typically causing
excessive fuel in the engine and then partial engine failure. One was in a
Yak 55 which was clearly running badly and so the pilot elected to return to
his home airfield and then on finals to land he was coming a bit low; opened
the throttle, and nothing happened so landed just outside the airfield,
fortunately with no damage!
Richard
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode@russianaeros.com
<mailto:richard.goode@russianaeros.com>
<http://www.russianaeros.com> www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Jill Gernetzke
Sent: 03 March 2019 22:55
Subject: RE: Yak-List: Carb discussion and canopy seal
Richard,
Could you provide us with the details of the membrane failure, symptoms of a
problem prior to crash, etc. that would be beneficial to the group's
knowledge and awareness. A picture of the failed membrane would be nice.
Thank you!
Jill Gernetzke
M-14P, Inc.
Message 2
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| Subject: | Re: Carb discussion and canopy seal |
>
> Certainly. The pilot was flying an aerobatic routine in France when he recounted
(subsequently) that the engine missed and then recovered, but over about 10
minutes it became worse and worse and then finally the engine was hardly delivering
any power at all, hence his doing an emergency forced-landing in a field,
where the propeller hit the ground, hence causing the need for a shock-load
inspection, which we have to do in Europe.
Substitute UK for France and the fact that I was able to deadstick it back in,
thats almost a carbon copy of my incident. Hopefully will get an answer next week
when my partner and I open it up. [/quote]
--------
CJ and Yak-52 owner
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487908#487908
Message 3
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| Subject: | Re: Carb discussion and canopy seal |
Price for the canopy seal, please Jill? Or via separate email, I sent.
Peter Scott
PLEASE NOTE MY NEW EMAIL ADDRESS is peter@scottbase.id.au
Please use the new address in future communications.
On Mon, Mar 4, 2019 at 10:06 AM Jill Gernetzke <jill@m-14p.com> wrote:
> Richard,
>
>
> Could you provide us with the details of the membrane failure, symptoms of
> a problem prior to crash, etc. that would be beneficial to the group's
> knowledge and awareness. A picture of the failed membrane would be nice.
> Thank you!
>
>
> *Jill Gernetzke*
>
> M-14P, Inc.
>
>
Message 4
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| Subject: | Re: Carb discussion and canopy seal |
jill(at)m-14p.com wrote:
> I have submitted the pix, but they are not posting for some reason. If you
> want to view the pix, I will post on M-14P, inc. FB page.
>
> Have a great weekend!
>
> Jill
>
> Group,
>
> I am late to the discussion, but needed to clarify that an AK-14 diaphragm
> can be utilized on the Huosai or AI-14 Carburetor (K-14). There are two
> additional holes in the AK-14 diaphragm. These are of no consequence as it
> is sealed between the two parts of the carburetor.
>
> I do not have a Huosai carburetor apart, but I have attached photos of the
> K-14 carburetor. The original carburetor diaphragm also has two additional
> "blind holes" in a different location than the Ak-14 diaphragm, but
> nonetheless, "holes to nowhere".
>
> If there is still debate about why the Ak-14 diaphragm will not work, I
> would like to hear the reason, as I am always open to learning.
>
> The bigger issue, in my opinion, is people thinking that they can change out
> a diaphragm and "fix" their carburetor. In all of the years that we have
> been overhauling carburetors, we have only had 3 defective diaphragms.(None
> resultant in a catastrophic failure.) It really is a testament to Russian
> engineering. As Richard stated, the carburetors should be overhauled every
> 6 years, or so. There are numerous o-rings in the carburetor that go bad
> with time and heat cycles. The butterfly shaft has 3 o-rings, alone. The
> actuating assembly is in a lubricating bath of turbine oil. This area of the
> carburetor is very close to #6 exhaust, so it is more common for these
> o-rings to be a problem than a failing diaphragm. Sometimes, people mistake
> leaking fluid from the bottom of the carburetor as fuel, but if they really
> look and feel it, they may find it is turbine oil. The o-rings are no
> longer doing their job on the butterfly shaft. The beauty of the Russian
> design is that the o-rings serve as both a seal and a bearing surface, so
> wear is minimal if the carburetors are overhauled at prescribed intervals.
> Any use of Mo-Gas with ethanol will destroy the rubber bits in the
> carburetor, fuel pump and even fuel hoses. Stay away from it.
>
> Also, replying to the request this morning for Yak 52 canopy seals (leather)
> - We stock them.
>
>
> Jill Gernetzke
> M-14P, Inc.
Do you overhaul carburators for the Housai engines also?
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
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http://forums.matronics.com/viewtopic.php?p=487928#487928
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