Today's Message Index:
----------------------
1. 09:01 AM - Wilga Parts possible sale? (Bob Weigant)
2. 09:19 AM - Re: Prop balancing (Bob Fitzpatrick)
3. 12:28 PM - Re: Prop balancing for Yak 52's or CJ6's (San Francisco Bay Area) ()
4. 03:22 PM - Yak 18 Article (Graeme Frew)
5. 05:46 PM - Poker Run (Frank Haertlein)
6. 06:00 PM - Re: Prop balancing (KevLCo@aol.com)
7. 07:05 PM - push rod tube seals (jay reiter)
Message 1
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| Subject: | Wilga Parts possible sale? |
--> Yak-List message posted by: Bob Weigant <weigant@hevanet.com>
We are thinking about parting out our 1982 PZL 104-80. Total time airframe
and engine 200 hrs. Everything but the prop and landing gear will be up for
grabs.
Bob Weigant
25741 E Highview Ct
Welches OR 97067-9743
<weigant@hevanet.com>
503-622-5866
Message 2
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| Subject: | Re: Prop balancing |
--> Yak-List message posted by: Bob Fitzpatrick <rmfitz@direcway.com>
Your story sounds very familiar.
After servicing the hub and changing seals last year i had the bright
idea that i could set the blade angle by jacking up the plane and pulling
the blades past a 30g drum (FAA approved) set behind the trailing edge. If
they track they must be the same angle, right? Fortunately i borrowed a
SmartTool to check my work. Wasn't even close. I now own a SmartTool.
I later set the record for "quickest pattern ever flown in a Yak" when i
got an education on the importance of having the counterweight arms against
the flange. Jill told me later that if you can put a fingernail between the
weight arm and the flange, you will feel a vibration. I had about 1/4". I
felt lots of vibration. It was so bad in the air i was amazed it didn't feel
that bad on run-up. After careful consideration i suspect that ground/gear
contact has a dampening effect. Make a note: test flights should be done on
long runways.
Things went well 'till MTW when Sergei commented on my vibration. Not that
it was bad, but that it got worse at high RPMs which is opposite of what
you'd expect. I took it to Gary Jet Center and their Aces box confimed .24
ips @ 90% & .11 ips @ 70%. They got it down to .04 @ 60% &.12 @ 90%. Claud,
who was very helpful considering this was his first Yak, told me at these
levels it wouldn't take much to change balance, including the moisture in
the wood. I have always been careful to leave the prop horizontal to keep
moisture from migrating tip to root but he pointed out this prop has a large
chord and it may take 20 min. of flying to equalize moisture that has moved
from leading to trailing edges and vice versa. I've always pulled the prop
through periodically when the plane sits a long time. Now i make sure to
pull an odd number of blades to keep the moisture moving chord-wise.
bob
aka Boris
52BN
----- Original Message -----
From: <KevLCo@aol.com>
To: <yak-list@matronics.com>
Sent: Tuesday, March 09, 2004 8:18 PM
Subject: Re: Yak-List: Prop balancing
> --> Yak-List message posted by: KevLCo@aol.com
>
> Thanks to all who responded with helpful tips and guidance in reference
to my
> vibration problem. Your experiences and guidance are what keep us all
coming
> back to the board.
>
> A little recap of the events, just in case it may help someone else. As
> previously stated, I had resealed the prop, both the dome/piston seals
and the
> blade root seals. I reassembled the prop/hub assembly with great care
(I find
> that I frustrate my employer with my determined thoroughness), and set
the blade
> angles to book value. There was a horrible vibration. I rechecked my
work,
> and asked a local old timer to do the same. We both came up with the
same
> result. There were no balancing weights to remove from the hub to begin
with, so
> maybe I needed to add some on..... And with the help of an ACES
vibration
> analysis box and some new weight plates I made, I once again have a
smooth
> running engine that is the envy of the airfield.
>
> I found several things that helped me through the problem, I'll cover
them
> briefly for anyone who might find them useful.
>
> I had a problem of consistent results when checking the blade angles.
> Jacking the aircraft enough to steady the ship during prop rotation
seemed to take
> out several tenths/degree of error from one reading to another. Each
time a
> blade angle was set, the value would deviate .1 or .2 after moving the
prop
> around. Again, I'm rather meticulous, and this was irritating.
> While it's on jacks, might as well bring up the mains to level the hub
face
> to 90 deg. Math was never my best subject, and with the hub at 90 deg,
the
> blade angles were easier to interpret.
> While tightening the counterbalance arms to secure the blade angles, I
used
> wooden wedges between the hub and counterbalance arms to keep them up
against
> the lip of the collar where they belong. Otherwise, there was an
ongoing
> struggle to tighten the arm, keep the balance arm up against the collar
while not
> messing up the blade angle I had just set up.
> On the subject of tightening the counterbalance arms, completely torque
them
> each time you think you have the angle set, you may find that the
process of
> torqueing slightly changes the setting.
> My Yak does not have a spinner, therefore guessing where to mount the
balance
> weights is an act of educated guesses. The weights are mounted to the
prop
> hub, around the blade mounting nut. When the test calls for weight 25
degrees
> from the blade target, you have to use a guess as to where on the hub
ring to
> mount the weight. Normally, you would use the spinner bulkhead to mount
the
> weight right where the test calls for it. No such luxury for me. We
seemed to
> guess right the first time, I consider ourselves lucky.
> We started with 1.4 Inches per second variation. That's pretty ugly.
After
> using the dynamic balancer, adding some weight here and there, we ended
up
> with just over .4 One can really feel the difference.
>
> Again, thanks to all who responded on the board, and those that returned
my
> calls. Your experience and desire to assist others is what keeps our
kind of
> aviation going and growing.
>
> Kevin
> Las Vegas
> N152YK
> A&P/IA/CSEL/CMEL
> e-i-e-i-o
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Prop balancing for Yak 52's or CJ6's (San Francisco Bay |
Area)
--> Yak-List message posted by: <johnhilterman1@cox.net>
He must be pretty strong to hoist 14 Yaks and CJs!
>
> From: "Mark Schrick" <schrick@pacbell.net>
> Date: 2004/03/08 Mon AM 10:56:15 EST
> To: <yak-list@matronics.com>
> Subject: Yak-List: Prop balancing for Yak 52's or CJ6's (San Francisco Bay Area)
>
> --> Yak-List message posted by: "Mark Schrick" <schrick@pacbell.net>
>
> If you want your prop balance right and you are on the West coast, contact 2
> Genes Aviation (Frank) at South County Airport (Q99). He has a new digital
> prop balancer that also works as a dynamic prop balancer. This will get the
> vibration out of your engine compartment.
>
> Reasonable rates and knows the Yak and CJ's inside out. Does all the
> maintenance and annuals for the (11) Yaks in the San Francisco Bay area. Good
> guy too.......
>
> 2 Genes Aviation (Frank) (408) 683-4102
>
> He also help hoist the February ACM clinic just held last weekend. (14 Yak's
> and CJ's) Great hoist.
>
> ********************************************************************
> Mark Schrick
> 966 Wallace Drive
> San Jose, Ca 95120-1848
> Hm/Fax 408-323-5150
> Cell 408-391-6664
> Email schrick@pacbell.net
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of KevLCo@aol.com
> To: yak-list@matronics.com
> Subject: Yak-List: Prop balancing
>
> --> Yak-List message posted by: KevLCo@aol.com
>
> Ok, I was well intentioned. I wanted to do a good job, and I did, honest.
> My mission, as set forth by my employer, was to clean up our prop. No more
> oil
> streaks, leaks or grease streaks. We run a clean operation. So off to the
> -52 I went, new seals in hand for both dome and blades. There was a little
> head scratching to get to the blade seals ~ thanks to all who suffered my
> phone
> calls and questions. Back together it all went with no parts left over. And
> I
> even put the airplane on jacks to level the prop hub and set PERFECT blade
> angles (I even used a brand new digital smartlevel, Dennis!). I was rather
> proud of myself, until the boss fired it up and the engine wanted desparately
> to
> seperate itself from the engine mounts.
>
> I now realize I put the blades at a better condition than it was prior to the
> project, and now the weights need to be pulled and a dynamic balance
> accomplished. Any one have a contact for this near our fair town of Las
> Vegas? The
> local guy here that does the spam cans says he can't make his equipment work
> on
> the Yak. He's tried, but something about the radial/gearbox just doesn't
> work for him.
>
> Thanks,
> Kevin
> N152YK
> Yak-52
>
>
>
>
>
>
>
Message 4
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--> Yak-List message posted by: "Graeme Frew" <gfrew@attglobal.net>
I can't recall who was after the Yak 18T article. Did you get a reply from the
magazine?. Their email is mail@ausaviation.com.au They tell me they have just
posted their last copy to 'a guy' in the states so I'm hoping that was the one
on the list. Let me know if not as theyv'e offered to photocopy said article.
Cheers,
Graeme Frew
Message 5
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--> Yak-List message posted by: "Frank Haertlein" <yak52driver@earthlink.net>
So Cal Yakkers,
The Antelope Valley Chapter of the 99's are holding a poker run at
William J Fox airfield (WJF) this coming Sunday. Start time is 9:00 AM
with a BBQ afterwards. All kinds of excellent prizes to be awarded. It's
a little late to submit the application but they accept participants at
the door! Anyone besides me interested? Here's the flyer
http://home.earthlink.net/~yak52driver/newsletter.pdf
Frank
N9110M
YAK-52
For another cheap thrill................
A video, 5 Megabytes large. Takes awhile to download but it shows what
happens to Arabs who defy the US. I must say, it's a most pleasing
video....especially after what happened to us on 911. Click the link
below for examples of helicopter kills :)
http://home.earthlink.net/~yak52driver/224.mpg
Message 6
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| Subject: | Re: Prop balancing |
--> Yak-List message posted by: KevLCo@aol.com
oops. I ended up with .04, not .4 as written. My bad.
Message 7
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| Subject: | push rod tube seals |
--> Yak-List message posted by: "jay reiter" <jmreiter@adelphia.net>
Has anybody changed the push rod tube seals on a Huosai? What is the easiest way
to do the change? Are the seals regular hose or are they a preformed special
part?
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