X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 17 Apr 2007 18:10:42 -0400 Message-ID: X-Original-Return-Path: Received: from bay0-omc2-s37.bay0.hotmail.com ([65.54.246.173] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1990303 for lml@lancaironline.net; Tue, 17 Apr 2007 17:12:23 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.173; envelope-from=randystuart@hotmail.com Received: from hotmail.com ([65.55.139.13]) by bay0-omc2-s37.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Tue, 17 Apr 2007 14:11:37 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 17 Apr 2007 14:11:36 -0700 X-Original-Message-ID: Received: from 68.183.72.42 by BAY134-DAV3.phx.gbl with DAV; Tue, 17 Apr 2007 21:11:34 +0000 X-Originating-IP: [68.183.72.42] X-Originating-Email: [randystuart@hotmail.com] X-Sender: randystuart@hotmail.com From: "Randy" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Gear Trouble X-Original-Date: Tue, 17 Apr 2007 14:11:35 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0039_01C780FA.4EA2A610" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-OriginalArrivalTime: 17 Apr 2007 21:11:36.0895 (UTC) FILETIME=[FBF7C4F0:01C78134] X-Original-Return-Path: randystuart@hotmail.com This is a multi-part message in MIME format. ------=_NextPart_000_0039_01C780FA.4EA2A610 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I don't know if the problem is from a spool valve, this is the second = pump I've had in my plane and both have done the same thing in warmer = weather. And, of course, being in southern California it's usually = always on the warm side.=20 I can see on the gear pressure gauge that as the heat goes up so does = the pressure. It's gets to a point where the pressure opens both = pressure switches, so when I switch to gear down there's no connection. = One small tap on the dump valve and it releases the excess pressure on = the low side and the pump lites up.=20 I've seen this same problem with other Lancairs I fly with but never a = solution. There should be a small expansion tank or relief valve going = back to the reservoir on the low side of the pump. Last resort would be = a relay to over ride the low pressure switch, fed through the high = pressure circuit for a momentary pump start. This would have the same = effect as tapping the dump valve for a second. I'm not sure what the = answer is. Randy Stuart LNC2 ----- Original Message -----=20 From: marv@lancair.net=20 To: lml@lancaironline.net=20 Sent: Tuesday, April 17, 2007 01:42 PM Subject: [LML] Re: Gear Trouble Posted for "Randy" : I've always had a problem when the weather warms up at all. The gear = won't=20 come down unless I crack open the dump valve for a second. I don't = like doing=20 that but if I don't I can't get the pressure out of the low switch to = start=20 the pump. I've tried adjusting the pressure switches a little each way = to see=20 if it would help but it doesn't. Maybe a bypass relay to start the = pump in the=20 down position would be the answer.=20 Randy Stuart LNC2 [Randy, it almost sounds like you're fighting an internal pump issue. = If you've got the pressure switches set to their lowest possible = settings to achieve consistently reliable operation at _some_ particular = temperature, unless there is something restricting the internal flow = there is almost no reason that temperature should be able to be removed = from the equation (ie, temp increase =3D pressure increase, which should = be dealt with already). Isn't this one of the=20 symptoms we hear about so often with the reversed spool valve? = Greyhawk...??? ] -- For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html ------=_NextPart_000_0039_01C780FA.4EA2A610 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I don't know if the problem is = from a=20 spool valve, this is the second pump I've had in my plane and both have = done the=20 same thing in warmer weather. And, of course, being in southern = California it's=20 usually always on the warm side.
I can see on the gear pressure = gauge that=20 as the heat goes up so does the pressure. It's gets to a point where the = pressure opens both pressure switches, so when I switch to gear down = there's no=20 connection. One small tap on the dump valve and it releases the excess = pressure=20 on the low side and the pump lites up.
I've seen this same problem with = other=20 Lancairs I fly with but never a solution. There should be a = small expansion=20 tank or relief valve going back to the reservoir on the low side of the = pump.=20 Last resort would be a relay to over ride the low pressure switch, fed = through=20 the high pressure circuit for a momentary pump start. This would = have the=20 same effect as tapping the dump valve for a second. I'm not sure what = the answer=20 is.
Randy Stuart
LNC2
----- Original Message -----
From:=20 marv@lancair.net=20
Sent: Tuesday, April 17, 2007 = 01:42=20 PM
Subject: [LML] Re: Gear = Trouble

Posted for "Randy" = <randystuart@hotmail.com>:<= BR>
I've=20 always had a problem when the weather warms up at all. The gear won't =
come=20 down unless I crack open the dump valve for a second. I don't like = doing=20
that but if I don't I can't get the pressure out of the low switch = to=20 start
the pump. I've tried adjusting the pressure switches a = little each=20 way to see
if it would help but it doesn't. Maybe a bypass relay = to start=20 the pump in the
down position would be the answer.
Randy=20 Stuart
LNC2


[Randy, it almost sounds like you're = fighting an=20 internal pump issue.  If you've got the pressure switches set to = their=20 lowest possible settings to achieve consistently reliable operation at = _some_=20 particular temperature, unless there is something restricting the = internal=20 flow there is almost no reason that temperature should be able to be = removed=20 from the equation (ie, temp increase =3D pressure increase, which = should be=20 dealt with already).  Isn't this one of the
symptoms we hear = about so=20 often with the reversed spool valve?  = Greyhawk...???   =20 <Marv>       ]

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