Today's Message Index:
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1. 12:47 AM - Re: Yak 55M Start (Frank Stelwagon)
2. 06:17 AM - Re: Yak 55M Start (Scott Poehlmann)
3. 06:17 AM - Re: Yak 55M Air Start (Scott Poehlmann)
4. 08:32 AM - Re: LaCross-Springfield-Columbus (David McGirt)
5. 09:16 AM - Re: Yak 55M Air Start (doug sapp)
Message 1
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| Subject: | Re: Yak 55M Start |
One other place to check is the start button itself and the attached
wires. The buttons will get corrosion in them and contact becomes
marginal. Also check the wires in the connector at the solenoid and the
pins for corrosion.
In electrical systems corrosion does strange things.
Frank
CJ6-A N23021
Message 2
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| Subject: | Re: Yak 55M Start |
Hi Frank,
Unfortunately, the start "button" is actually an actuator rod which
moves the valve itself (as in the Sukhois). There are no wires and no
solenoid...
Scott
----- Original Message -----
From: Frank Stelwagon
To: yak-list@matronics.com
Sent: Tuesday, 04 July, 2006 01:45
Subject: Re: Yak-List: Yak 55M Start
One other place to check is the start button itself and the attached
wires. The buttons will get corrosion in them and contact becomes
marginal. Also check the wires in the connector at the solenoid and the
pins for corrosion.
In electrical systems corrosion does strange things.
Frank
CJ6-A N23021
Message 3
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| Subject: | Re: Yak 55M Air Start |
Hi Pappy,
Unfortunately, there is no solenoid. The valve is direct actuated, as
the one in the Sukhois (in fact it's the same valve...).
Scott
----- Original Message -----
From: cjpilot710@aol.com
To: yak-list@matronics.com
Sent: Monday, 03 July, 2006 22:11
Subject: Re: Yak-List: Yak 55M Air Start
In a message dated 7/3/2006 11:00:43 PM Eastern Daylight Time,
scott-p@texas.net writes:
I am not an expert on the 55M but it sounds like to me that your air
solenoid might be bad or very weak. It may operate OK when cold but not
so after exposed to heat. The solenoid may be just weak enough to work
OK cool but not be able to open the valve when it has been heated up and
the valve expanse.
Jim "Pappy" Goolsby
Hi All,
Have an interesting and troublesome problem. For the last several
weeks I have had trouble with the starting the Yak. The scenario is
always like this: go out, check the air (650-750 psi), turn the prop
through (15 blades), prime, pull the prop through (15 blades), get in,
prime, start without any trouble. Go fly acro, mostly working on
Advanced-level figures, rollers, inverted spins, half-snaps, with the
occaisional run through an Intermediate Known or Free, land, taxi to the
pump, fill gas, check the air (again 650-750 psi), get in, prime, hit
the starter and nothing happens. I mean NOTHING, no hiss of air, no prop
moving, and certainly no start. Rarely I can get the prop to just barely
move (less than 1/3 blade), but otherwise nothing. Pulling the prop
through in this condition demonstrates that it isn't hydro-locked.
My troubleshooting has run like this: 1) There is air in the system.
2) The prop is not hydro-locked. 3) The primer works. 4) The air start
valve is clean and in good condition (took it out, cleaned and inspected
it last week...).
Now I have run out of ideas. Could the air distributor be at fault?
If so how, and how do I check it, and how do I sort it out. Ideas?
Voodoo spells? Secret Russian code words? I'm up for anything that will
work here...
Thanks,
Message 4
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| Subject: | LaCross-Springfield-Columbus |
I must agree, it was well worth the 6.5hr flight both ways to be there with
everyone!
Here are some pics that a lot of us saw at dinner Sunday night - these are
from the airshow.. Enjoy:
http://www.mcgirt.net/yak/07-01-06_Columbus_Nebraska/pics1/Index.htm
David
_____
[mailto:owner-yak-list-server@matronics.com] On Behalf Of cjpilot710@aol.com
Sent: Tuesday, July 04, 2006 1:24 AM
Troops,
Just returned from 3 weeks on the road doing the RPA airshows. I had a
great time thank you!
The LaCross show crowd was not up to what the local folks expected but it
was a very well run. They had not one but TWO B-2s flying by at the same
time. We had only 4 RPA pilots there plus one T-34 guy who came by to help
out. We were able to get one Wingman check ride done. And none of us will
ever forget sitting on the runway awaiting our turn to fly, when a F-18A
blast from behind us just 75' above, in full AB and at Mach .99!! Scared
the shit out of me!!!
I than flew by my lonesome to SPI.
The crowds at the Springfield (SPI), IL. show was off also. But this show
is well run and the performers are treated very well. We had 14 RPA pilots
and planes there. When we weren't giving VIP rides or practicing, or doing
the show, the fellow ship was great. Anyone missing this show should have
their head examined.
It was than off to Columbus (OLU), Nebraska. The city was cerebrating their
150 year. Lots of stuff was happening in town. This was OLU first real
airshow, and for all the stuff that was happening in town, there was good
crowd at the airport. There was supposed to be FAST clinic but none of the
students showed however we were able to get a Lead flight check done and now
"Wild Bill" Walker had that the crown. Some major and minor mechanical
accrued but more about that later. My "major" air leak turned out to be the
rear flap handle out of it's detent. 13 RPA members from TX, CO, AR, TN, GA.
and FL (me) were there. Keith and Janis Harbor were our hosts and this was
the best time I've had so far. We had a banquet at "Dusters" possibly the
best restaurant right in the middle of the US which by-the-way Columbus is
very near.
As a tradition some new call signs were assigned. Bob Langford is now
"Lefty." Our #14 airplane, a B-13 Voltee Vibrator pilot is now "Big Bird."
You just don't know how many times he was told to raise his gear and his 43
foot wing span confused a number of our guy's spacing.
Ashley bought her 52 but opted to ride on the wing of a PT-19!! Yes, lads
this patet big brown eyed RPA beauty is a wing walker!!
This morning we started departing. Some went south. Some went west. Me,
Bob "Lefty" Langford, "Wild Bill" Walker, and David "Talon" McGirt headed
south east. A warm front had us change stops to reconnoiter at OTM where we
refueled and beat feet out with an approaching CB. Our destination was SPI
but half way there, Talon's new 396 "radar" showed clear to the SE and we
departed company. Boy those Yaks TWs are slow. In 2:25 I only burned 29
gals of fuels. :)
I left my CJ in SPI where she'll in a hangar for 3 weeks while I play with
grandma and my grandkids. I'll airline back to SPI to meet up with RPAers
again to do the Peoria, IL airshow before heading up to MTW/OSH. After OSH
I'll fly the CJ to DE to celebrate my wife's and I's 43 wedding anniversary.
Than its down to FD44 (home) before catching an airliner to PIT to fly the
B-17 for a few weeks.
God help me. I do love it so!
Jim "Pappy" Goolsby
Message 5
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| Subject: | Yak 55M Air Start |
Scott,
Have you done this test yet? Next time the problem occurs:
Disconnect the hose which runs FROM the start solenoid TO the start spider
on the engine, then hit the button and confirm that the start solenoid is
functioning and you DO have air at the start spider. If you do have air at
the start spider then timing in the start spider has somehow slipped or
changed enough to not allow the air to pass and for the engine to start, if
you don't have air at the start spider you most likely have an intermittent
start solenoid, which is not all that uncommon. To prove this check to make
sure you are in fact delivering air pressure TO the start solenoid. My
guess it that you will find that your start solenoid is intermittent.
If the problem turns out to be timing I am sure that Dennis can help, if the
problem is in the start solenoid I have them for the CJ6 and I do think they
just might be the same.
Hope this helps.
Always Yakin,
Doug Sapp
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com]On Behalf Of Scott Poehlmann
Sent: Monday, July 03, 2006 7:58 PM
To: yak-list@matronics.com
Subject: Yak-List: Yak 55M Air Start
Hi All,
Have an interesting and troublesome problem. For the last several weeks I
have had trouble with the starting the Yak. The scenario is always like
this: go out, check the air (650-750 psi), turn the prop through (15
blades), prime, pull the prop through (15 blades), get in, prime, start
without any trouble. Go fly acro, mostly working on Advanced-level figures,
rollers, inverted spins, half-snaps, with the occaisional run through an
Intermediate Known or Free, land, taxi to the pump, fill gas, check the air
(again 650-750 psi), get in, prime, hit the starter and nothing happens. I
mean NOTHING, no hiss of air, no prop moving, and certainly no start. Rarely
I can get the prop to just barely move (less than 1/3 blade), but otherwise
nothing. Pulling the prop through in this condition demonstrates that it
isn't hydro-locked.
My troubleshooting has run like this: 1) There is air in the system. 2)
The prop is not hydro-locked. 3) The primer works. 4) The air start valve is
clean and in good condition (took it out, cleaned and inspected it last
week...).
Now I have run out of ideas. Could the air distributor be at fault? If so
how, and how do I check it, and how do I sort it out. Ideas? Voodoo spells?
Secret Russian code words? I'm up for anything that will work here...
Thanks,
Scott
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