X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 10 Jun 2008 03:05:58 -0400 Message-ID: X-Original-Return-Path: Received: from web82707.mail.mud.yahoo.com ([68.142.201.88] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with SMTP id 2960433 for lml@lancaironline.net; Mon, 09 Jun 2008 16:19:32 -0400 Received: (qmail 44863 invoked by uid 60001); 9 Jun 2008 20:19:31 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type:Message-ID; b=bK1NPmkGcmaI7USfLrOAn7G8SDuybTcHOOUAudq3bqmM+k3ekgnLs7lEV4elHKAY83XHFUE9W5RVkpfXi4d0fpG0ZL134iJ0Z8JZBXPw9JrI9Lc+USFu45Z383yj2lgreR4M9fhWpqqf/aPdrKLOlA+gWLVkf8KUIzgP4vEkqDs=; X-YMail-OSG: v01opR4VM1kBJufMCt37_QsAZPxouTrHFyyGH6eATSdGBfp5Pbr3SgQ1uhA68riPhkpmD3zSpbN5mjLnTcVM4f7pfTMz1eUKZ1POgfkxXNWwBKZbpR7BiT0- Received: from [75.16.249.55] by web82707.mail.mud.yahoo.com via HTTP; Mon, 09 Jun 2008 13:19:30 PDT X-Mailer: YahooMailRC/975.41 YahooMailWebService/0.7.185 X-Original-Date: Mon, 9 Jun 2008 13:19:30 -0700 (PDT) From: Earl Schroeder Subject: Re: [LML] Re: Cabin air outlet X-Original-To: Lancair Mailing List MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-527886310-1213042770=:44844" X-Original-Message-ID: <968402.44844.qm@web82707.mail.mud.yahoo.com> --0-527886310-1213042770=:44844 Content-Type: text/plain; charset=us-ascii Here is a link to Wicks that still has some options : http://preview.tinyurl.com/64dc2f Earl ----- Original Message ---- From: GT-Phantom To: lml@lancaironline.net Sent: Monday, June 9, 2008 7:10:42 AM Subject: [LML] Re: Cabin air outlet If you are really desperate for air, you can VERY CAREFULLY have your canopy drilled for the 3" round plexiglass vents. If you want them closed in flight, just rotate them to the rear. I had this arrangement on my 235 and it worked quite nicely - even at idle on the ground it gave a good blast into the cabin, and in Atlanta summers can be brutal. At high speed cruise, suction sometimes pulled them open. I eventually drilled a small vertical hole on opposite sides of the retaining rim and ran a small dowen through them to hold the vent closed. I don't see the exact ones any more on their site, but these http://www.aircraftspruce.com/catalog/appages/koolscoop.php are similar in concept. The round ones were nice because turning them backwards insured no rain could come in the cabin at cruise. Regards, Bill ________________________________ From: Paul Lipps [mailto:elippse@sbcglobal.net] Sent: Saturday, June 07, 2008 21:48 To: lml@lancaironline.net Subject: Cabin air outlet 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. --0-527886310-1213042770=:44844 Content-Type: text/html; charset=us-ascii
Here is a link to Wicks that still has some options : http://preview.tinyurl.com/64dc2f

Earl

----- Original Message ----
From: GT-Phantom <gt_phantom@hotmail.com>
To: lml@lancaironline.net
Sent: Monday, June 9, 2008 7:10:42 AM
Subject: [LML] Re: Cabin air outlet

If you are really desperate for air, you can VERY CAREFULLY have your canopy drilled for the 3" round plexiglass vents.  If you want them closed in flight, just rotate them to the rear.
 
I had this arrangement on my 235 and it worked quite nicely - even at idle on the ground it gave a good blast into the cabin, and in Atlanta summers can be brutal.
 
At high speed cruise, suction sometimes pulled them open.  I eventually drilled a small vertical hole on opposite sides of the retaining rim and ran a small dowen through them to hold the vent closed.
 
I don't see the exact ones any more on their site, but these http://www.aircraftspruce.com/catalog/appages/koolscoop.php are similar in concept.  The round ones were nice because turning them backwards insured no rain could come in the cabin at cruise.
 
Regards,
 
Bill

From: Paul Lipps [mailto:elippse@sbcglobal.net]
Sent: Saturday, June 07, 2008 21:48
To: lml@lancaironline.net
Subject: Cabin air outlet

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.
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