X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 26 Mar 2013 12:41:25 -0400 Message-ID: X-Original-Return-Path: Received: from nm11-vm3.bullet.mail.ne1.yahoo.com ([98.138.91.141] verified) by logan.com (CommuniGate Pro SMTP 6.0.2) with ESMTPS id 6140941 for lml@lancaironline.net; Tue, 26 Mar 2013 01:56:06 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.91.141; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.57] by nm11.bullet.mail.ne1.yahoo.com with NNFMP; 26 Mar 2013 05:55:30 -0000 Received: from [98.138.226.168] by tm10.bullet.mail.ne1.yahoo.com with NNFMP; 26 Mar 2013 05:55:30 -0000 Received: from [127.0.0.1] by omp1069.mail.ne1.yahoo.com with NNFMP; 26 Mar 2013 05:55:30 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 817563.87794.bm@omp1069.mail.ne1.yahoo.com Received: (qmail 14587 invoked by uid 60001); 26 Mar 2013 05:55:30 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=3WC0CAVvWOWzwWvv/9KXWdiBE6SrfJmck0cI0czWq0kBFKdQv5b8o2FmBCjSKsvUKsOUp8JYg7MVvWfYqehUXpcrk5eehPSZ1l7qbEROrpUOnT2Mw+q7AvVnuVQdrbv4ybaqvVCjYUAWR9C7iJEqvC07ti65+5suO1QWWZyaI1M=; X-YMail-OSG: A4lAdZQVM1kBrbKE4pBpRj8JgSEQDkxKcO4InK6dCG.mSZI QFteOl9wx2riOm03TDCToBzqkGOexMpHahc9w66ViHlxylfdwjccqRXIgioV p9XuyzAsqjyJGFvdjOMe48cClBVklGyPKVm7iJ5tgJLwGrdwKGL23s.WoRtk Iy6etsy8ZVoM5_cKOVtdj_SZF1Psk06RqWCjLZEKKbqJ_zArJXexOdDRlhVQ 7QPkoua0P3rLm2Tpr9ksXR3dOQTLztyoJxfEOSJxjOF9bu131KITTU_XglWQ 1Mny8nJjwIOSk45JAcYhIQkX22xN.OkN97TSuevM30lyldpS30gVEv0HzcEM x5zdKwoTTMIHG8Y12_TjW5p7hcNUJZ4OYhZa9xMx4xwO4XjYOnrqmgsbi.o2 msOsGqJnhGRNkHKm2EeYG5F8Zt71i7_kaMPIJmuuObjYX7d0txwLaNBHo2km duRgwxTOnUclyxWBUhx7oiHXsjXg67Jq8mcYd6gXUq8zQqCInH.Lz_turKwf oLo96ievECNtmbkdXMsDQ5TaYZE9cwuE5CErUQCeW3eWFS2HEKwyLjpXwnb8 PV5H2e8RrSx7L5USMJZ9t44Q- Received: from [99.102.29.6] by web121601.mail.ne1.yahoo.com via HTTP; Mon, 25 Mar 2013 22:55:30 PDT X-Rocket-MIMEInfo: 002.001,QW5naWVyLApTb2xlbm9pZHMgdGhhdCBvcGVuIGFuZCBjbG9zZSB3aGlsZSBjYXJyeWluZyBsYXJnZSBjdXJyZW50cyBuZWVkIHRvIG9wZW4gYW5kL29yIGNsb3NlwqB3aXRoIG1vcmUgZm9yY2UgYW5kIHNwZWVkIHNvIHRoZXkgZG8gbm90wqB3ZWxkIHRoZW1zZWx2ZXMgc2h1dC7CoCBTb21ldGltZXMgeW91IHdpbGwgc2VlIGRpZmZlcmVudCByYXRpbmdzIGZvciAnbWFrZScgYW5kICdicmVhayfCoCAoY2xvc2UgYW5kIG9wZW4pLsKgIFRoZSBzcHJpbmdzIGluIHRoZXNlIHJlbGF5cyBhcmUgcXVpdGUgYSBiaXQBMAEBAQE- X-Mailer: YahooMailWebService/0.8.139.530 References: X-Original-Message-ID: <1364277330.3676.YahooMailNeo@web121601.mail.ne1.yahoo.com> X-Original-Date: Mon, 25 Mar 2013 22:55:30 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: Hydraulic gear pump failure X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-1977980688-466709517-1364277330=:3676" ---1977980688-466709517-1364277330=:3676 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Angier,=0ASolenoids that open and close while carrying large currents need = to open and/or close=A0with more force and speed so they do not=A0weld them= selves shut.=A0 Sometimes you will see different ratings for 'make' and 'br= eak'=A0 (close and open).=A0 The springs in these relays are quite a bit he= avier and so is the coil.=A0 You will note=A0a much higher current draw on = a starter vs. master solenoid coil.=0A=A0=0AWhen dropping the gear during a= n actual emergency extension, I would suggest slowing to 80 KIAS before ope= ning the dump valve.=A0 This will allow momentum from the free-fall aid in = the extension.=A0 If dropped at a higher speed the gear essentially comes t= o a stop and it is then gas strut vs. air load.=A0=A0 =0ADuring in-flight c= hecks it is useful to drop the gear at a higher speed to check the health o= f the gas strut.=A0 A healthy strut should get the gear down at 100+ KIAS.= =A0 During a real free-fall you want to stack the odds in your favor and sl= ow down first.=0AChris=0A=A0=0AChris Zavatson=0AN91CZ=0A360std=0Ahttp://www= .n91cz.net/=0A =0A=0A________________________________=0A From: "Greenbacks,= UnLtd." =0ATo: Lancair Mailing List =0ASent: Monday, March 25, 2013 4:43 PM=0ASubject: [LML] Re: Hydraulic = gear pump failure=0A =0AAbout 3 mos ago, the high side relay failed while = 4ZQ was up on jacks. I figured that old age (original kit) plus X number of= cycles during construction took that relay to the end of its useful life. = So trying to kill two birds with one stone, I replaced both hi/lo relays wi= th new (chinese) from the local auto parts store.=0A=0AThe cause of yesterd= ay's gear failure turned out to be the NEW low side relay, and it had just = 14 cycles....=0A=0ASo, on the assumption that relay quality differs, who ma= kes a HIGH quality relay with the same footprint as those that=0Acame with = the kit? Any reason why they should not be continuous duty type?=0A=0AAngie= r Ames=0AN4ZQ=0A--=0AFor archives and unsub http://mail.lancaironline.net:8= 1/lists/lml/List.html ---1977980688-466709517-1364277330=:3676 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Angier,
Solenoids that open= and close while carrying large currents need to open and/or close wit= h more force and speed so they do not weld themselves shut.  Some= times you will see different ratings for 'make' and 'break'  (close an= d open).  The springs in these relays are quite a bit heavier and so i= s the coil.  You will note a much higher current draw on a starte= r vs. master solenoid coil.
 
= When dropping the gear during an actual emergency extension, I would = suggest slowing to 80 KIAS be= fore opening the dump valve.  This will allow momentum from the free-f= all aid in the extension.  If dropped at a higher speed the gear essentially comes to a stop and it is then gas strut vs. air load. &n= bsp;
During in-flight checks it is useful to drop t= he gear at a higher speed to check the health of the gas strut.  A hea= lthy strut should get the gear down at 100+ KIAS.  During a real free-fall you want to stack the od= ds in your favor and slow down first.
Chris
 
Chris Zavatson
N91CZ
360std
From: "Greenbac= ks, UnLtd." <N4ZQ@VERIZON.= NET>
To: Lancair Ma= iling List <lml@lancaironline.net>
Sent: Monday, March 25, 2013 4:43 PM
Subject: [LML] Re: Hydraulic gear pump f= ailure

About 3 mos ago, the high side relay failed w= hile 4ZQ was up on jacks. I f= igured that old age (original kit) plus X number of cycles during construct= ion took that relay to the end of its useful life. So trying to kill two bi= rds with one stone, I replaced both hi/lo relays with new (chinese) from the local auto parts store.
=
The cause of yesterday's gear failure turned out to be the NEW low side relay, and it h= ad just 14 cycles....

So, on the assumption that relay quality diffe= rs, who makes a HIGH quality relay with the same footprint as those thatcame with the kit? Any reason why they should not be continuous duty type?=

Angier Ames
N4ZQ
--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/Li= st.html


 
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