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Ernie
Joined: 11 Jan 2006
Posts: 513
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 Posted: Tue Mar 31, 2015 4:59 am Post subject: Flow Restrictors |
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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
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CJ_Pneumatic_System_Schematic_Diagram.pdf |
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dsavarese0812(at)bellsout
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| Posted: Tue Mar 31, 2015 5:22 am Post subject: Flow Restrictors |
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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:
| Quote: | 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
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dougsappllc(at)gmail.com
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| Posted: Tue Mar 31, 2015 8:05 am Post subject: Flow Restrictors |
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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(at)gmail.com (erniel29(at)gmail.com)> wrote:
[quote]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
[b]
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Ernie
Joined: 11 Jan 2006
Posts: 513
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| Posted: Tue Mar 31, 2015 8:14 am Post subject: Flow Restrictors |
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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(at)gmail.com (dougsappllc(at)gmail.com)> wrote:
[quote]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(at)gmail.com (erniel29(at)gmail.com)> wrote:
| Quote: | 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
et="_blank">http://www.matronics.com/Navigator?Yak-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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[b]
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jblake207(at)comcast.net
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| Posted: Tue Mar 31, 2015 9:44 am Post subject: Flow Restrictors |
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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(at)gmail.com>
To: "Yak-List" <yak-list(at)matronics.com>
Sent: Tuesday, March 31, 2015 7:57:38 AM
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
[quote][b]
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Ernie
Joined: 11 Jan 2006
Posts: 513
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| Posted: Tue Mar 31, 2015 9:52 am Post subject: Flow Restrictors |
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Thanks Bud!
On Tue, Mar 31, 2015 at 1:44 PM, <jblake207(at)comcast.net (jblake207(at)comcast.net)> wrote:
[quote]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(at)gmail.com (erniel29(at)gmail.com)>
To: "Yak-List" <yak-list(at)matronics.com (yak-list(at)matronics.com)>
Sent: Tuesday, March 31, 2015 7:57:38 AM
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
| Quote: |
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3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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[b]
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rmhou(at)yahoo.com
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| Posted: Tue Mar 31, 2015 10:33 am Post subject: Flow Restrictors |
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Pictures!
On Tuesday, March 31, 2015 11:00 AM, Ernest Martinez <erniel29(at)gmail.com> wrote:
Thanks Bud!
On Tue, Mar 31, 2015 at 1:44 PM, <jblake207(at)comcast.net (jblake207(at)comcast.net)> wrote: | Quote: | 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(at)gmail.com (erniel29(at)gmail.com)>To: "Yak-List" <yak-list(at)matronics.com (yak-list(at)matronics.com)>Sent: Tuesday, March 31, 2015 7:57:38 AMSubject: 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
| Quote: |
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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"http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
"http://forums.matronics.com/">http://forums.matronics.com
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glipaz
Joined: 11 Jan 2011
Posts: 110
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| Posted: Thu Nov 12, 2015 3:29 pm Post subject: Re: Flow Restrictors |
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On this same topic, I removed the six air fittings from the rear gear handle and noticed that a flow restrictor fell to the floor of the cockpit. Which line did it come from? In the diagram I note a restrictor on the line that goes to the extend side of the gear actuators. Can someone please confirm?
Thanks, Gil
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