X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 07 Jun 2008 21:48:13 -0400 Message-ID: X-Original-Return-Path: Received: from smtp124.sbc.mail.sp1.yahoo.com ([69.147.64.97] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with SMTP id 2958100 for lml@lancaironline.net; Sat, 07 Jun 2008 20:54:54 -0400 Received: (qmail 44248 invoked from network); 8 Jun 2008 00:54:55 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=zTYcN3ptnBOrAmTPf1pLaU5Eij1YTCEQLqCJZ4ZLOXZbmeIg3IpCyFUuGtxjmXQyhV68Y9V8zMuFPh3aDbyczVFV63+I7SHhewQXYUAN5cWxc6ScyOiToORd8RphHSwWMI3JtQU3/66Fz176pPByRKW7nsOcQAIDA+bdk6WevCY= ; Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@75.15.153.111 with login) by smtp124.sbc.mail.sp1.yahoo.com with SMTP; 8 Jun 2008 00:54:54 -0000 X-YMail-OSG: 1R8iudgVM1kz2wxJw93K5PAG2LGbN4Fp5D8MOYObOcik5YW_Qr8Y6aybbKVSYrr25VhlHznjWNHva5eQHj5EAi_GihZnV_T8CW4fIejKFPRiuMiP4nqJ7C0z2BqR4zUEX08- X-Yahoo-Newman-Property: ymail-3 X-Original-Message-ID: <000801c8c902$4b9172c0$6f990f4b@Computerroom> From: "Paul Lipps" X-Original-To: "Marv Kaye" Subject: Cabin air outlet X-Original-Date: Sat, 7 Jun 2008 17:55:04 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C8C8C7.9D9872C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C8C8C7.9D9872C0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I have a 2 1/2" by 1" outlet just behind the canopy on the top of the = fuselage. At the forward end, just behind the roll-over rib is the inlet = which is a 4" square muffin fan. This fan is powered by a solar cell in = the back-top of the canopy to provide airflow on the ground with the = canopy closed. Since a very large portion of your body's heat rejection = is in your head, it is important to have the air flow up your body and = past your head. This outlet is fitted with a counter-weighted door that = is flanked by triangular side plates about 1 1/2' high at the back end = with turned-inward top edges to restrain the door's opening range; the = door prevents rain from entering when on the ground. This opening is in = a low pressure region which promotes the flow and is open during flight. If your curved-divergent submerged inlets, NACA ducts, are located = above the first third of the leading edge of the wing you will have = minimal flow since that is a low pressure region. To increase the flow, = place toed-in triangular VGs at the forward end of the duct, about 1" = long and 3/8" at the back high with their forward, pointy-ends about = 3/8" apart, angled inward at about 15 deg. each. Or you can do like I = did and put a 1" diameter hole at the base of your windshield and feed = that into your cabin outlets. Mine, after diverging, goes into a = Lancair-purchased 105 CFM blower before exhausting through large, = plastic eyeball vents at the bottom of the instrument panel. I get flow = through these on the ground when my fixed-pitch rpm is above 1000. I = have the blower tied into a circuit that turns it on when the gear is = down and the canopy is closed and a three-position switch is in AUTO. = The switch also turns it OFF or ON. ------=_NextPart_000_0005_01C8C8C7.9D9872C0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
I have a 2 1/2" by 1" outlet just behind the = canopy on the=20 top of the fuselage. At the forward end, just behind the roll-over rib = is the=20 inlet which is a 4" square muffin fan. This fan is powered by a solar = cell in=20 the back-top of the canopy to provide airflow on the ground with the = canopy=20 closed. Since a very large portion of your body's heat rejection is in = your=20 head, it is important to have the air flow up your body and past your = head. This=20 outlet is fitted with a counter-weighted door that is flanked by = triangular=20 side plates about 1 1/2' high at the back end with turned-inward=20 top edges to restrain the door's opening range; the door prevents = rain from=20 entering when on the ground. This opening is in a low pressure region = which=20 promotes the flow and is open during flight.
    If your curved-divergent = submerged=20 inlets, NACA ducts, are located above the first third of the leading = edge of the=20 wing you will have minimal flow since that is a low pressure region. To = increase=20 the flow, place toed-in triangular VGs at the forward end of the duct, = about 1"=20 long and 3/8" at the back high with their forward, pointy-ends = about 3/8"=20 apart, angled inward at about 15 deg. each. Or you can do like I did and = put a=20 1" diameter hole at the base of your windshield and feed that into your = cabin=20 outlets. Mine, after diverging, goes into a Lancair-purchased = 105 CFM=20 blower before exhausting through large, plastic eyeball vents at the = bottom of=20 the instrument panel. I get flow through these on the ground when my = fixed-pitch=20 rpm is above 1000. I have the blower tied into a circuit that turns it = on when=20 the gear is down and the canopy is closed and a three-position switch is = in=20 AUTO. The switch also turns it OFF or ON.
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