Today's Message Index:
----------------------
1. 05:45 AM - Re: Flight Review Video - WhirlWind Aviation 3-Blade Propeller (Harv)
2. 10:31 AM - Memorial Day (Herb Coussons)
3. 10:42 AM - Yak 50 gear problem (Gord)
4. 05:21 PM - Gear problem Yak 50 (gord)
5. 05:43 PM - Re: Gear problem Yak 50 (Vic)
6. 06:45 PM - Re: Re: Gear problem Yak 50 (gord)
7. 10:51 PM - Re: Re: Gear problem Yak 50 (Jan Mevis)
8. 10:57 PM - Re: Re: Gear problem Yak 50 (Jan Mevis)
Message 1
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| Subject: | Re: Flight Review Video - WhirlWind Aviation 3-Blade Propeller |
Looks great!
Now the big question, are you supplying it with a hub that's splinded for fitment
to the Housai engine? [Wink]
Harv
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374083#374083
Message 2
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I hope all of you have been able to enjoy the long weekend and catch up
on some much needed rest and relaxation and maybe get out to fly.
Today, I will take a moment to honor the brave men and women who have
made the ultimate sacrifice for our freedom. Today we honor our fallen
soldiers, sailors, airmen, and Marines.
The sacrifice these soldiers have made is not just theirs. It's also a
sacrifice made by their families, friends, and brothers in arms.
Memorial Day is also a time to honor those who continue to put
themselves in harm's way to protect our nation and our freedoms.
I know many on this list have served and I have had the privilege of
getting to know you, some of America's finest. There are still alot of
us out here who recognize and still care despite the politics around us.
To all those who serve and have served, I salute you. Your dedication
to our Country is second to none. Thank you for your sacrifice and
patriotism.
In Remembrance,
Dr. Herb Coussons, MD
drc@wscare.com
2641 Development Drive
Green Bay, WI 54311
Cell 920-639-8434
Work 920-338-6868
Fax 920-338-6869
Message 3
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| Subject: | Yak 50 gear problem |
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UHV0IGxldmVyIGRvd24uLm5vdGhpbmcgdXAgbm90aGluZy4ucHJlc3MgwqBvayBsZXZlciBmbG9w
cHkuIERpZCDCoGVtZXIgZXh0ZW5zaW9uIG9rIMKgbGFuZGVkLiDCoEdvaW5nIHRvIHN3aW5nIGdl
YXIuIEFueSBpZGVhcyDCoHRrcyDCoEdvcmQKCgpTZW50IGZyb20gU2Ftc3VuZyBNb2JpbGU
Message 4
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| Subject: | Gear problem Yak 50 |
It appears that I had a gear problem right after take off and maybe both
were down to some degree. We now have the airplane on jacks. The
emergency
system worked fine and the gear was down and locked. Air pressures
normal.
When we retracted the gear both red lights out=85left green light out
right
green light on and the weird part was the actual gear position left
gear
unlocked about 2=94 right gear =BD retracted. Any air seemed to be
coming
from the emergency tank as we did a few cycles the emrg tank pressure
decreased . The main tank remained full . So our problem seems to be no
air
to retract/extend from main tank. Trying to work through the schematic
we
have is pretty challenging. Any ideas would be much appreciated. I
don=92t
mind reimbursing someone to help my mechanic solve this puzzle if that
would
help. I need to get back in the air for a couple of airshows. Thanks
Gord
Message 5
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| Subject: | Re: Gear problem Yak 50 |
Hi Gord,
when you have activated the emergency system you wont be able to retract the landing
gear subsequently. Just empty the emergency tank completely, close the tap
and then do a refill to 50 bar and all should be working as usual. Only with
this procedure the rubber ball in the respective shuttle valve will shift to
the "normal" position.
Cheers
Vic
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374120#374120
Message 6
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| Subject: | Re: Gear problem Yak 50 |
Thanks Vic.
We will try that in the morning. Where is the shuttle valve located? I am
wondering why I had the retraction problem in the first place and then not
being able to get the gear down normally. Maybe the shuttle valve needs
cleaning? We will know more tomorrow.
As I understand the schematic for the gear.... air goes from main tank
through the main air valve to the undercarriage lever where it is routed to
either side of the undercarriage jack. Please correct me if this is wrong.
Thank goodness for this forum! Gord
Message 7
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| Subject: | Re: Gear problem Yak 50 |
Gord, you must not use the emergency system to full blow down of the gear,
when on jacks. Be careful: there's NO restriction on the pressure when
using the emergency system.
Furthermore: the Russians say that you must not use the emergency system
more than three times (in full force) without having a serious inspection
of the system, just because there's no restriction to the air coming from
the emergency flask (logical: you want the gear down and locked, even with
bad seals).
There IS a restriction, a small disk with a tiny hole, in the circuit of
the normal system.It is on top of the connection to the actuator.
DO NOT LOOSE THAT VERY SMALL DISK when you want to dissassemble the leads
to the actuators.
As far as I understand, you did not get enough pressure to lock the gear
in the upper position. You may have leaks on the lines to the actuator, or
maybe in the actuator itself. When was it last overhauled?
Also: the system on the 50 is quite different from the system on the Yak
52.You'll be amazed: the whole actuator can move (and has to be able to)
contrary to the Yak 52.
I'd suggest that you get someone knowledgeable about the Yak 50.
Good luck,
Jan
On 29/05/12 03:43, "gord" <gord@thedampub.ca> wrote:
>
>Thanks Vic.
>
>We will try that in the morning. Where is the shuttle valve located? I am
>wondering why I had the retraction problem in the first place and then not
>being able to get the gear down normally. Maybe the shuttle valve needs
>cleaning? We will know more tomorrow.
>
>As I understand the schematic for the gear.... air goes from main tank
>through the main air valve to the undercarriage lever where it is routed
>to
>either side of the undercarriage jack. Please correct me if this is wrong.
>
>Thank goodness for this forum! Gord
>
>
Message 8
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| Subject: | Re: Gear problem Yak 50 |
You can empty the emergency system by using the brakes, left, right,
alternately, use the rudder.
If there's some air left in the main system, the shuttle valve will
ultimately pop back to the other side.
Then do your gear tests on jacks. My guess is that you have some air loss
on the line to the left actuator. Maybe a broken line.
Anyway, if it has been a long time, then now is a good opportunity to
overhaul the actuators?
Jan
On 29/05/12 03:43, "gord" <gord@thedampub.ca> wrote:
>
>Thanks Vic.
>
>We will try that in the morning. Where is the shuttle valve located? I am
>wondering why I had the retraction problem in the first place and then not
>being able to get the gear down normally. Maybe the shuttle valve needs
>cleaning? We will know more tomorrow.
>
>As I understand the schematic for the gear.... air goes from main tank
>through the main air valve to the undercarriage lever where it is routed
>to
>either side of the undercarriage jack. Please correct me if this is wrong.
>
>Thank goodness for this forum! Gord
>
>
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