Today's Message Index:
----------------------
1. 09:02 AM - Re: CJ6 Mods (Marcus Bates)
2. 09:02 AM - Sudden Stoppage Reply (Jill Gernetzke)
3. 03:08 PM - Don Andrews (Brian Lloyd)
4. 04:54 PM - List Enclosure Support (Matt Dralle)
5. 05:57 PM - Bandits due North..Lachute, QC, Canada fly-in (david stroud)
6. 09:14 PM - Yak-52 V530 Prop Question (Mike Bell)
7. 09:28 PM - Re: Yak-52 V530 Prop Question (Walter Lannon)
8. 10:52 PM - Re: Yak-52 V530 Prop Question (Mike Bell)
Message 1
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Doug....contact me off-list. Thanks... Marcus Bates, Jr
(mlbjr@earthlink.net)
Message 2
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| Subject: | Sudden Stoppage Reply |
Group,
There was a thread running a week or so ago about sudden stoppage,
"shock loads" and engine teardowns. Our opinion differs from a
previous posting.
Carl submits the following:
To add our experience on the =93sudden stoppage=94 question, I offer
the
following with respect to M-14P engines and V-530 props:
While we have not sold hundreds of aircraft, since 1993 we have
repaired more engines than anyone in the West, including complete
teardowns. We are also certified by OKBM for repair and overhaul of
the M-14P.
Let=92s start by defining terms. A =93prop strike=94 alone says nothing=20=
about forces experienced by the engine. A =93sudden stoppage=94 defines
a
reduction in engine RPM from some external or internal cause. The rate=20=
of deceleration is the key to how much damage may have occurred. We
have seen only four sources of stoppage:
1. The engine had oil in a cylinder that did not compress with the
air
start turning the engine.
This will usually result in a bent link rod. A teardown of the power
section is necessary to check crank
runout (necessary) and is perhaps the easiest way to change the link=20=
rod as any other way.
2. The engine had oil in a cylinder or sucked it in from the intake=20=
tube and did not compress after
the engine fired. The first thing to check, if the engine will turn,
is the magneto timing. This tells if the
accessory shaft is twisted. Next, a teardown of the power section. We=20=
usually find the crank rear
counterweight has rotated on the bearing shaft. This is a quick, cheap=20=
fix. Continued rotation, however,
results in broken teeth on the cam drive gear and cam idler gear.
Broken teeth on the generator drive gear
and damaged accessory shaft are very possible. A new link rod and
probably a new cylinder will also be needed.
3. A previously bent link rod fails in flight. The prop shaft will=20=
shear. In the worst case we have seen,
there were two pistons in one cylinder. The entire engine will be
trash.
4. The rotating prop hits something. If you taxi into something
solid
like a fire hydrant, the resultant
damage will be the same as in #2 above, except for no damage to a link=20=
rod or cylinder. If you experience
a gear up landing you have to make a decision. At landing speed, the
aircraft travels 3.5 feet for each blade
in contact with the ground at initial point of contact. As the engine=20=
slows, this increases. Consequently,
the rearward deflection of a very thin blade exceeds the rotational
shearing. Additionally, the reduction
of blade length per rotation with a normal flare landing is less than a=20=
tenth of an inch. In other words, the
wood fails well before any engine parts are stressed to the +400
foot/lbs of torque design load.
We had many conversations with the Russian overhaul factory during the=20=
90=92s and with OKBM in 2001. They require a teardown under their
system
(labor is cheap) but no one could recall damage from a gear up landing.=20=
We have sold 20 =96 30 sets of blades for replacements on gear up
landings with no known subsequent problems with the engines. Having
overhauled many V530 prop hubs, there is no doubt that it will fail
last.
If you land gear up, you must weigh the costs, down time, damage
probabilities and future consequences. If I landed my Yak 52 gear up
in a n normal landing configuration, I will install new blades and keep=20=
flying.
Carl Hays
Continuing in Doug Sapp's vein, we are also committed to the long haul=20=
of keeping your aircraft flying. Every day we address new R&D
challenges, shortages, bureaucratic entanglements, etc. This business=20=
is not for the faint of heart. I think as Yak owners, we have enjoyed=20=
the relatively cheap joys of owning and operating these aircraft. The=20=
pendulum is swinging the other way. I don't begrudge the Russians
asking for high prices, right now. Eventually this market will have to=20=
normalize itself. That means some factories in Russia will flourish,
some have folded or will fold. I have a choice to buy their parts or
find my own solutions. I have spent several thousand dollars to
manufacture dies to stamp out gaskets and more money stuck into the
inventory of those gaskets. I appreciate every single sale I make.
There are easier ways to make more money and at far less risk, but I
personally love what I do and enjoy (most) people in this business.
Years ago, we heard of a small group of entrepreneurs in Russia that
had purchased a factory that had closed down. They began a rabbit meat=20=
processing plant and used the fur byproduct to make ushankas - the
classic Russian fur hat. Our partners in Moscow asked if we would be
interested in trying to establish a market over here. We
wholeheartedly agreed to give it a whirl and ordered 100 ushankas. I
sold some to customers, outfitted family members in Wisconsin and New
York but I still have a bunch left here in Arizona (big market). We
never expected to make a fortune on this venture. In fact, if we broke=20=
even we'd be happy. We did have an interest in helping a company that=20=
was trying in an business climate where that is still difficult.
The bottom line is that M-14P Inc. is in business to make sure your
airplane is flying, make a little money to keep the lights on and have=20=
a little bit of fun along the way.
Jill Gernetzke
Message 3
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--> Yak-List message posted by: Brian Lloyd <brian-yak@lloyd.com>
Don,
Please contact me directly. Seems I no longer have your email address.
Please do not reply on the Yak-list as I will not see it.
Thanks.
Brian Lloyd 361 Catterline Way
brian-yak AT lloyd DOT com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
Message 4
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| Subject: | List Enclosure Support |
--> Yak-List message posted by: Matt Dralle <dralle@matronics.com>
Dear Listers,
Over the years, I have resisted the urge to enable enclosure support on the Matronics
Lists for a number of reasons relating to performance, capacity, capability,
and security. However, its now 2006 and most everyone using email these
days is on an email client that, at some level, supports the viewing and handling
of enclosures. I get a fair amount of email each month from people on the
various Lists asking why their posts of this or that picture didn't go through.
Back quite a while ago by popular request, I enabled enclosure support for a few
Lists such as the RV10-List, Kolb-List, and the Tailwind-List. Contrary to
my fears, there really hasn't been any significant issues on these Lists relating
to the advent of enclosure support and for the most part, members have policed
themselves well with respect to the size of things they have posted.
Having enclosures enabled on some Lists and not others has given me a fair amount
of headaches with respect to filtering messages and content since the formats
are often quite different between a typical MIME encoded message and a generic
plain-text message. The spammers are getting more cleaver all the time and
are constantly trying to thwart my best efforts at keeping them from posting
to the Lists.
So, for these reasons, I've have decided to go ahead and enable limited enclosure
posting on all of the email Lists at Matronics. This will not only increase
the utility of the Lists, but will afford me a better opportunity to filter
out the chaff.
Here are some of the features and limits of enclosures on the Matronics Lists:
1) Enclosures will only be posted to the Real Time version of the
Lists.
2) Enclosures will NOT be included in the Daily Digest version of
the Lists.
3) Enclosures WILL BE forwarded on to the BBS Forum Web site.
4) Enclosures will NOT be appended to the Archives.
5) Enclosures will NOT be available in the List Browse feature.
6) Only the following file types and extensions will be allowed:
jpg, bmp, gif, txt, xls, pdf, and doc
All other enclosures types will be rejected and email returned to
sender. The enclosure types listed above are relatively safe from
a virus standpoint and don't pose a particularly large security risk.
7) !! All incoming enclosures will be scanned for viruses prior to posting
to the List. This is done in real time and will not slow down
the process of posting the message !!
Here are some rules for posting enclosures. Failure to abide by these rules could
result in the removal of a subscriber's email address from the Lists.
1) Pay attention to what you are posting!! Make sure that the files
you are enclosing aren't HUGE (greater that 1MB). Remember that there
are still people checking they're email via dial up modem. If you post
30MB worth of pictures, you are placing an unnecessary burden on these
folks and the rest of us, for that matter.
2) SCALE YOUR PICTURES DOWN!!! I don't want to see huge 3000 x 2000
pictures getting posted that are 3 or 4MB each. This is just
unacceptable. Use a program such as Photoshop to scale the picture
down to something on the order of 800 x 600 and try to keep the
file size to less-than 200KB, preferably much less.
Microsoft has a really awesome utility available for free that allows
you to Right-Click on a picture in Explorer and automatically
scale it down and resave it. This is a great utility - get it, use it!
http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx
Look for the link "Image Resizer"
3) !! This would seem to go without saying, but I'll say it anyway. Do not
post anything that would be considered offensive by your grandmother.
And you know what I'm saying; I don't want to see anything even
questionable. !!
4) REMEMBER THIS: If you post a 1MB enclosure to a List with 1000 members
subscribed, your 1MB enclosure must be resent 1000 times amounting
to 1MB X 1000 = 1 Gigabyte of network traffic!! BE CAREFUL and BE COURTEOUS!
I hope everyone will enjoy the added functionality of enclosures. Please police
yourself and use good judgement when posting messages with enclosures using
the guidelines I've outlined above.
Best regards,
Matt Dralle
Matronics Email List Administrator
Message 5
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| Subject: | Bandits due North..Lachute, QC, Canada fly-in |
I had a chance to slide over to Lachute today and observe a bit of the
fly-in
arranged by Dan Fortin of this list. The weather was a bit dodgy but
they got
in two sorties this morning and planned three more for the afternoon.
Dan had
things well organized and the guys seemed to be having fun. Sure was
nice
hearing those round engine sounds again.
David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 early construction
Message 6
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| Subject: | Yak-52 V530 Prop Question |
--> Yak-List message posted by: "Mike Bell" <yakflyr@comcast.net>
Is there a specified torque for the counterweight/blade clamp nuts?
Thanks,
Mike
--------
Mike Bell
Yak 52
Elk Grove, CA
yakflyr@comcastdotnet
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=38427#38427
Message 7
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| Subject: | Re: Yak-52 V530 Prop Question |
--> Yak-List message posted by: "Walter Lannon" <wlannon@cablerocket.com>
Mike;
Yes. It is 57 to 63 lb/ft for both the V530 and the J9G1 (Chinese)
propellors.
Walt
----- Original Message -----
From: "Mike Bell" <yakflyr@comcast.net>
Sent: Saturday, June 03, 2006 9:12 PM
Subject: Yak-List: Yak-52 V530 Prop Question
> --> Yak-List message posted by: "Mike Bell" <yakflyr@comcast.net>
>
> Is there a specified torque for the counterweight/blade clamp nuts?
>
> Thanks,
>
> Mike
>
> --------
> Mike Bell
> Yak 52
> Elk Grove, CA
> yakflyr@comcastdotnet
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=38427#38427
>
>
>
Message 8
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| Subject: | Re: Yak-52 V530 Prop Question |
--> Yak-List message posted by: "Mike Bell" <yakflyr@comcast.net>
Thanks Walt. Don't want those things flying off.
Mike
do not archive
--------
Mike Bell
Yak 52
Elk Grove, CA
yakflyr@comcastdotnet
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=38441#38441
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