Today's Message Index:
----------------------
1. 05:59 AM - Flow Restrictors (Ernest Martinez)
2. 06:22 AM - Re: Flow Restrictors (A. Dennis Savarese)
3. 09:05 AM - Re: Flow Restrictors (doug sapp)
4. 09:14 AM - Re: Flow Restrictors (Ernest Martinez)
5. 10:44 AM - Re: Flow Restrictors (jblake207@comcast.net)
6. 10:52 AM - Re: Flow Restrictors (Ernest Martinez)
7. 11:33 AM - Re: Flow Restrictors (Robin Hou)
8. 07:58 PM - Landing light bulb (Frank)
9. 10:07 PM - Re: Air Leak Advice (AcroGimp)
Message 1
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| Subject: | Flow Restrictors |
Can anyone tell me what the flow restrictors are for on the CJ main air
system gear circuits? Obviously they restrict air, but whats the purpose?
To prevent slamming? Are the actuators rated for a lower pressure than the
overall system?
On that note. I'm looking at that nice color air schematic (attached) that
I got from the list, and noticed something that's puzzling me. If you look
at the drawing, there is 1 flow restrictor shared by all 3 gear for the
Retract side. On the Extend side each gear leg has it's own restrictor.
Note that on the main gear legs the restrictor prior to the shuttle valve,
or NOT in the emergency circuit, but the nose gear has the restrictor AFTER
the shuttle valve, or in BOTH the normal and emergency circuit.
I'm assuming this is a diagramming error..... if not, can someone explain.
Ernie
Message 2
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| Subject: | Re: Flow Restrictors |
You are correct. They restrict flowwhen in the circuit. Yes, they
prevent the gear from slamming. Restrictors have absolutely no affect on
the pressure. Only the flow. The actuators are not rated for a lower
pressure. If you were to remove them from the main gear and do a gear
retraction test, you will see quite a bit of difference in the speed of
the retraction/extension versus without the restrictor.
I don't know the answer to the question regarding the restrictor shown
on the schematic in the nose gear circuit after the shuttle valve.
Dennis
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/31/2015 7:57 AM, Ernest Martinez wrote:
> Can anyone tell me what the flow restrictors are for on the CJ main
> air system gear circuits? Obviously they restrict air, but whats the
> purpose? To prevent slamming? Are the actuators rated for a lower
> pressure than the overall system?
>
> On that note. I'm looking at that nice color air schematic (attached)
> that I got from the list, and noticed something that's puzzling me. If
> you look at the drawing, there is 1 flow restrictor shared by all 3
> gear for the Retract side. On the Extend side each gear leg has it's
> own restrictor. Note that on the main gear legs the restrictor prior
> to the shuttle valve, or NOT in the emergency circuit, but the nose
> gear has the restrictor AFTER the shuttle valve, or in BOTH the normal
> and emergency circuit.
>
> I'm assuming this is a diagramming error..... if not, can someone explain.
>
> Ernie
Message 3
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| Subject: | Re: Flow Restrictors |
All,
Dennis is, as per normal 100% correct.
For the correct placement of the restrictors see pages 281 and 282 in IPB
#1. See items #17, 33, and 40 (sub). The Chinese call them "dampers",
note that they have different part numbers this is because they all have
different sized holes drilled in them. Now see the schematic on page 279
in the same book to find the factory placement location of items #17, 33,
and 40.
We carry the restrictors in stock, undrilled/blank if you need them.
It is possible, with a bit of tinkering to alter the hole size in the
restrictors and modify the speed and order of gear retraction. I saw one
CJ which retracted exactly like a "std" aircraft in that all three gear hit
the gear wells at exactly the same time.
Hope this helps.
Best,
Doug
On Tue, Mar 31, 2015 at 5:57 AM, Ernest Martinez <erniel29@gmail.com> wrote:
> Can anyone tell me what the flow restrictors are for on the CJ main air
> system gear circuits? Obviously they restrict air, but whats the purpose?
> To prevent slamming? Are the actuators rated for a lower pressure than the
> overall system?
>
> On that note. I'm looking at that nice color air schematic (attached) that
> I got from the list, and noticed something that's puzzling me. If you look
> at the drawing, there is 1 flow restrictor shared by all 3 gear for the
> Retract side. On the Extend side each gear leg has it's own restrictor.
> Note that on the main gear legs the restrictor prior to the shuttle valve,
> or NOT in the emergency circuit, but the nose gear has the restrictor AFTER
> the shuttle valve, or in BOTH the normal and emergency circuit.
>
> I'm assuming this is a diagramming error..... if not, can someone explain.
>
> Ernie
>
Message 4
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| Subject: | Re: Flow Restrictors |
Doug,
My parts manuals are in the hangar. Is the diagram that I attached
incorrect, and the nose gear restrictor should be behind the diverter?
Thanks
Ernie
On Tue, Mar 31, 2015 at 12:05 PM, doug sapp <dougsappllc@gmail.com> wrote:
> All,
>
> Dennis is, as per normal 100% correct.
>
> For the correct placement of the restrictors see pages 281 and 282 in IPB
> #1. See items #17, 33, and 40 (sub). The Chinese call them "dampers",
> note that they have different part numbers this is because they all have
> different sized holes drilled in them. Now see the schematic on page 279
> in the same book to find the factory placement location of items #17, 33,
> and 40.
>
> We carry the restrictors in stock, undrilled/blank if you need them.
>
> It is possible, with a bit of tinkering to alter the hole size in the
> restrictors and modify the speed and order of gear retraction. I saw one
> CJ which retracted exactly like a "std" aircraft in that all three gear hit
> the gear wells at exactly the same time.
>
> Hope this helps.
>
> Best,
> Doug
>
> On Tue, Mar 31, 2015 at 5:57 AM, Ernest Martinez <erniel29@gmail.com>
> wrote:
>
>> Can anyone tell me what the flow restrictors are for on the CJ main air
>> system gear circuits? Obviously they restrict air, but whats the purpose?
>> To prevent slamming? Are the actuators rated for a lower pressure than the
>> overall system?
>>
>> On that note. I'm looking at that nice color air schematic (attached)
>> that I got from the list, and noticed something that's puzzling me. If you
>> look at the drawing, there is 1 flow restrictor shared by all 3 gear for
>> the Retract side. On the Extend side each gear leg has it's own restrictor.
>> Note that on the main gear legs the restrictor prior to the shuttle valve,
>> or NOT in the emergency circuit, but the nose gear has the restrictor AFTER
>> the shuttle valve, or in BOTH the normal and emergency circuit.
>>
>> I'm assuming this is a diagramming error..... if not, can someone explain.
>>
>> Ernie
>>
>
> *
>
>
> *
>
>
Message 5
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| Subject: | Re: Flow Restrictors |
Ernie, I didn't get a chance to tell you last weekend, but great looking ne
w ride you've got!=C2- Beautiful airplane!=C2- JB
----- Original Message -----
From: "Ernest Martinez" <erniel29@gmail.com>
Sent: Tuesday, March 31, 2015 7:57:38 AM
Subject: Yak-List: Flow Restrictors
Can anyone tell me what the flow restrictors are for on the CJ main air sys
tem gear circuits? Obviously they restrict air, but whats the purpose? To p
revent slamming? Are the actuators rated for a lower pressure than the over
all system?
On that note. I'm looking at that nice color air schematic (attached) that
I got from the list, and noticed something that's puzzling me. If you look
at the drawing, there is 1 flow restrictor shared by all 3 gear for the Ret
ract side. On the Extend side each gear leg has it's own restrictor. Note t
hat on the main gear legs the restrictor prior to the shuttle valve, or NOT
in the emergency circuit, but the nose gear has the restrictor AFTER the s
huttle valve, or in BOTH the normal and emergency circuit.
I'm assuming this is a diagramming error..... if not, can someone explain.
Ernie
Message 6
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| Subject: | Re: Flow Restrictors |
Thanks Bud!
On Tue, Mar 31, 2015 at 1:44 PM, <jblake207@comcast.net> wrote:
> Ernie, I didn't get a chance to tell you last weekend, but great looking
> new ride you've got! Beautiful airplane! JB
>
> ------------------------------
> *From: *"Ernest Martinez" <erniel29@gmail.com>
> *To: *"Yak-List" <yak-list@matronics.com>
> *Sent: *Tuesday, March 31, 2015 7:57:38 AM
> *Subject: *Yak-List: Flow Restrictors
>
> Can anyone tell me what the flow restrictors are for on the CJ main air
> system gear circuits? Obviously they restrict air, but whats the purpose?
> To prevent slamming? Are the actuators rated for a lower pressure than the
> overall system?
>
> On that note. I'm looking at that nice color air schematic (attached) that
> I got from the list, and noticed something that's puzzling me. If you look
> at the drawing, there is 1 flow restrictor shared by all 3 gear for the
> Retract side. On the Extend side each gear leg has it's own restrictor.
> Note that on the main gear legs the restrictor prior to the shuttle valve,
> or NOT in the emergency circuit, but the nose gear has the restrictor AFTER
> the shuttle valve, or in BOTH the normal and emergency circuit.
>
> I'm assuming this is a diagramming error..... if not, can someone explain.
>
> Ernie
>
> *
>
>
> *
>
>
Message 7
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| Subject: | Re: Flow Restrictors |
Pictures!
On Tuesday, March 31, 2015 11:00 AM, Ernest Martinez <erniel29@gmail.c
om> wrote:
Thanks Bud!
On Tue, Mar 31, 2015 at 1:44 PM, <jblake207@comcast.net> wrote:
Ernie, I didn't get a chance to tell you last weekend, but great looking ne
w ride you've got!=C2- Beautiful airplane!=C2- JB
From: "Ernest Martinez" <erniel29@gmail.com>
Sent: Tuesday, March 31, 2015 7:57:38 AM
Subject: Yak-List: Flow Restrictors
Can anyone tell me what the flow restrictors are for on the CJ main air sys
tem gear circuits? Obviously they restrict air, but whats the purpose? To p
revent slamming? Are the actuators rated for a lower pressure than the over
all system?
On that note. I'm looking at that nice color air schematic (attached) that
I got from the list, and noticed something that's puzzling me. If you look
at the drawing, there is 1 flow restrictor shared by all 3 gear for the Ret
ract side. On the Extend side each gear leg has it's own restrictor. Note t
hat on the main gear legs the restrictor prior to the shuttle valve, or NOT
in the emergency circuit, but the nose gear has the restrictor AFTER the s
huttle valve, or in BOTH the normal and emergency circuit.
I'm assuming this is a diagramming error..... if not, can someone explain.
Ernie
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Message 8
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| Subject: | Landing light bulb |
I have an IAR-823. It has a really strange landing light bulb. It looks like a
household light bulb, but with a bayonet type base and of course it's 24 volt.
Any thoughts on how to convert it to an LED?
Also I still have the core engine parts from my Nanchang cj6. Cylinders,baffling,
steel exhaust. It's in a Russian shipping crate and I would really like it
to go away.
Frank Surfas
530-622-4462
Sent from my iPad
Message 9
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| Subject: | Re: Air Leak Advice |
So new development at the hangar today. Main system had leaked down from 3.5 to
1.5 since Saturday afternoon - which had not been observed before.
Been through the search function and am learning a bit but not able to figure next
bit out so asking for help.
While in the cowling I bumped the snot valve and it released a good bit of air
- I am very sure, although not 100% sure, that I had cycled the snot valve on
shutdown like normal on Saturday, so it should not have been pressurized from
the previous run. The main air valve was OFF and had been since Saturday.
An hour later for my curiosity the snot valve was cycled and again released some
air (I had turned Main air ON to drop the flaps for an unrelated check while
installing a wing step) - it was OFF at the time.
Possibly related, I know I have a slow leak on the Emergency side, just not sure
where yet (suspect the tank itself based on troubleshooting for previous owner).
Ideas? Suggestions?
'Gimp
--------
Owner/Pilot N6209F 1987 Yak-52
COMM/ASEL/IFR/HP-Complex/TW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=440125#440125
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