X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 07 May 2006 19:46:59 -0400 Message-ID: X-Original-Return-Path: Received: from smtpauth08.mail.atl.earthlink.net ([209.86.89.68] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1095369 for lml@lancaironline.net; Sun, 07 May 2006 10:48:41 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.68; envelope-from=leighton@teleport.com DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=teleport.com; b=Iie6LS5a5dajm34DbV3g2JzXJ790yc2N3wgB8VABEr486QPOzr3bROkYmxmF5bHP; h=Received:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [4.242.171.94] (helo=user) by smtpauth08.mail.atl.earthlink.net with asmtp (Exim 4.34) id 1FckY4-0008T6-5K for lml@lancaironline.net; Sun, 07 May 2006 10:47:53 -0400 X-Original-Message-ID: <000601c671e5$3813a9a0$5eabf204@user> From: "Leighton" X-Original-To: "Lancair Mail list" Subject: inflatable canopy seals X-Original-Date: Sun, 7 May 2006 07:47:50 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01C671AA.8A64AAF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 X-ELNK-Trace: ea0fe3d44b30ba0fc355332e9c4b49d598c48853aa0a5d89946358f3bf809c0aebc557f59ae8b3ce350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 4.242.171.94 This is a multi-part message in MIME format. ------=_NextPart_000_0003_01C671AA.8A64AAF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The recent discussions about the inadvertant deflation of a door seal by = apparently switching off the toggle valve has inspired me to relay a = different approach we've taken to operate the inflatable seals. Instead = of using the Clippard MJTV-3 toggle valve we are using a small electric = solenoid valve, ETO-3, also made by Clippard. When no electric power is = supplied to the seal pump assembly the seal is vented through the valve. = When power is applied the valve directs compressed air to the seal and = closes the vent line. So, whenever the "cabin seal" switch is turned = off the seal automatically deflates. Or if the master is turned off it = also goes limp. Recently we did a retrofit installation of an = inflatable seal on John Halle's Legacy and decided to make it even more = idiot proof by putting a simple micro switchwired in series, behind the = canopy lever in the closed position so that when the canopy is unlatched = the seal also deflates. Works great and is easier than reeducating the = idiots. I'm sure there are any number of small pneumatic solenoid = valves that will do the job as well. =20 On the subject of the seal pump assemblies, we've noticed that the = pressure switches that come with them have been arriving set at about 22 = psi which is too high and will cause the canopy or door to be forced = outward. Somewhere between 5 and 10 psi seems about right. There is an = adjusting screw between the spade terminals on the pressure switch, = although my first attempt at finding it caused some head scratching as = it was covered with a black coating of some kind. Scrape it off and the = screw can be turned counterclockwise to reduce the pressure setting. I = use a simple mechanical gauge with a small hose hooked to the air output = to set it. =20 Someone recently was looking for a toggle type air valve to use as an = alternate static source and said the MJTV-3 wouldn't work. However, it = should work fine if the exhaust port is plugged making it a two way = valve.=20 Leighton Mangels ------=_NextPart_000_0003_01C671AA.8A64AAF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The recent discussions about the inadvertant = deflation of a=20 door seal by apparently switching off the toggle valve has inspired me = to relay=20 a different approach we've taken to operate the inflatable seals.  = Instead=20 of using the Clippard MJTV-3 toggle valve we are using a small electric = solenoid=20 valve, ETO-3, also made by Clippard.  When no electric power is = supplied to=20 the seal pump assembly the seal is vented through the valve.  When = power is=20 applied the valve directs compressed air to the seal and closes the vent = line.  So, whenever the "cabin seal" switch is turned off the seal=20 automatically deflates.  Or if the master is turned off it also = goes=20 limp.  Recently we did a retrofit  installation of an = inflatable seal=20 on John Halle's Legacy and decided to make it even more idiot proof by = putting a=20 simple micro switchwired in series, behind the canopy lever in the = closed=20 position so that when the canopy is unlatched the seal also = deflates. =20 Works great and is easier than reeducating the idiots.  I'm sure = there are=20 any number of small pneumatic solenoid valves that will do the job as=20 well. 
 
On the subject of the seal pump assemblies, we've = noticed that=20 the pressure switches that come with them have been arriving set at = about=20 22 psi which is too high and will cause the canopy or door to be forced=20 outward.  Somewhere between 5 and 10 psi seems about right.  = There is=20 an adjusting screw between the spade terminals on the pressure switch, = although=20 my first attempt at finding it caused some head scratching as it was = covered=20 with a black coating of some kind.  Scrape it off and the screw can = be=20 turned counterclockwise to reduce the pressure setting.  I use a = simple=20 mechanical gauge with a small hose hooked to the air output to set = it. =20
 
Someone recently was looking for a toggle type air = valve to=20 use as an alternate static source and said the MJTV-3 wouldn't=20 work.  However, it should work fine if the exhaust port is = plugged=20 making it a two way valve. 
 
Leighton Mangels
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