Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Wed, 01 Sep 2004 11:25:23 -0400 Message-ID: X-Original-Return-Path: Received: from [64.4.35.191] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 388274 for lml@lancaironline.net; Wed, 01 Sep 2004 11:13:26 -0400 Received-SPF: none receiver=logan.com; client-ip=64.4.35.191; envelope-from=gary21sn@hotmail.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 1 Sep 2004 07:59:51 -0700 Received: from 67.42.49.82 by bay12-dav17.bay12.hotmail.com with DAV; Wed, 01 Sep 2004 14:59:51 +0000 X-Originating-IP: [67.42.49.82] X-Originating-Email: [gary21sn@hotmail.com] X-Sender: gary21sn@hotmail.com From: "Gary Edwards" X-Original-To: "Lancair Mailing List" Subject: Re: Engine Cooling X-Original-Date: Wed, 1 Sep 2004 07:59:48 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0088_01C48FF9.A6F26A70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0006.2205 Seal-Send-Time: Wed, 1 Sep 2004 07:59:48 -0700 X-Original-Message-ID: X-OriginalArrivalTime: 01 Sep 2004 14:59:51.0475 (UTC) FILETIME=[552A4830:01C49034] This is a multi-part message in MIME format. ------=_NextPart_000_0088_01C48FF9.A6F26A70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I was wondering more about the temperature of the plastic shroud itself. Being very close and directly above the cylinder heads I assume it = would get very soft during a hot soak. True? Should it be made from = aluminum? I'm less worried about wires and such as wire insulation is silicone and should take it. I'm not sure the mags would get any hotter inside the plenum than behind the engine, but that is pure speculation as I have no data. Also, is there any reason to join the two sides of the plenum? = Why not build two small plenums, one on each side? Also, one of the links = from a previous post described a "RTV BID." Did they really mean = impregnating cloth with RTV? I assume that would make a flexible structure? I was puzzled. Gary Casey My LNC2 has a plenum chamber and many of you have seen it at the Lancair = Redmond Fly-In on Labor Day weekend. The plane was completed in 1999. =20 The plenum top is constructed of 4 bid E-glass with two, 1/8 " thick = glassed-over foam stiffeners on the underside. It also has removable = glass ramps from the bottom of the cowl inlets (bottom half of the cowl) = that fit in slots and pockets (for flex) all made of the same fiberglass = material. The ramps actually touch the cooling fins on the front = cylinders. I have had no problems with fiberglass deformation with the plenum top = or the ramps related to high heat. The airbrushed picture on the plenum = top also has shown no indications of heat stress over time. I have seen aluminum plenums, but fiberglass would be much easier to = deal with the curves and compound angles under the cowl. I thought about two separate plenums in the beginning. And I already = had my cowls built. It would have been more work, and after 10 years of = building, I was ready to get the plane finished. Gary Edwards LNC2 N21SN ------=_NextPart_000_0088_01C48FF9.A6F26A70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I was wondering more about the temperature of the plastic = shroud=20 itself.
Being very close and directly above the cylinder heads = I assume=20 it would
get very soft during a hot soak. True? Should it = be made=20 from aluminum?
I'm less worried about wires and such as wire = insulation is=20 silicone and
should take it. I'm not sure the mags would get = any hotter=20 inside the
plenum than behind the engine, but that is pure = speculation as I=20 have no
data. Also, is there any reason to join the two sides = of the=20 plenum? Why
not build two small plenums, one on each = side? Also,=20 one of the links from
a previous post described a "RTV BID." = Did they=20 really mean impregnating
cloth with RTV? I assume that would = make a=20 flexible structure? I was
puzzled.

Gary = Casey

My LNC2 has a plenum chamber and many of you have seen it at the = Lancair=20 Redmond Fly-In on Labor Day weekend. The plane was completed = in=20 1999.

The plenum top is constructed of 4 bid E-glass with two, = 1/8 "=20 thick glassed-over foam stiffeners on the underside. It also has = removable=20 glass ramps from the bottom of the cowl inlets (bottom half of the cowl) = that=20 fit in slots and pockets (for flex) all made of the same fiberglass=20 material. The ramps actually touch the cooling fins on the = front=20 cylinders.

I have had no problems with fiberglass deformation with the plenum = top or=20 the ramps related to high heat. The airbrushed picture on the = plenum top=20 also has shown no indications of heat stress over time.

I have seen aluminum plenums, but fiberglass would be much easier = to deal=20 with the curves and compound angles under the cowl.

I thought about two separate plenums in the beginning. And I = already=20 had my cowls built. It would have been more work, and after 10 = years of=20 building, I was ready to get the plane finished.

Gary Edwards

LNC2=20 N21SN

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