X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "William Schertz wschertz343@gmail.com" Received: from pmg.Logan.com ([207.170.160.161] verified) by logan.com (CommuniGate Pro SMTP 6.4.0) with ESMTPS id 3619561 for flyrotary@lancaironline.net; Sun, 13 Oct 2024 09:37:09 -0400 Received: from pmg.Logan.com (localhost [127.0.0.1]) by pmg.Logan.com (Proxmox) with ESMTP id A2F371C84C for ; Sun, 13 Oct 2024 09:37:09 -0400 (EDT) Received-SPF: pass (gmail.com ... _spf.google.com: Sender is authorized to use 'wschertz343@gmail.com' in 'mfrom' identity (mechanism 'include:_netblocks.google.com' matched)) receiver=pmg.Logan.com; identity=mailfrom; envelope-from="wschertz343@gmail.com"; helo=mail-oi1-f172.google.com; client-ip=209.85.167.172 Received: from mail-oi1-f172.google.com (mail-oi1-f172.google.com [209.85.167.172]) by pmg.Logan.com (Proxmox) with ESMTPS for ; Sun, 13 Oct 2024 09:37:09 -0400 (EDT) Received: by mail-oi1-f172.google.com with SMTP id 5614622812f47-3e3e590c31aso1382721b6e.0 for ; Sun, 13 Oct 2024 06:37:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1728826622; x=1729431422; darn=lancaironline.net; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :from:to:cc:subject:date:message-id:reply-to; bh=gmfNtlhDZxf6uNMX99BP4SuNrA4xWBxdOzxZsCWPQiw=; b=BBExfpo/tq4mptPH/w0E8P8QDMrdTwr8w9T1RnblCJHt4PRhoM/IVOpXpuqgsJePc/ 7vEpHRHqcRDvXQuV9K/p/4BUHDSoP0r13Va2vTs0LlrjI4rIDLN0Q4qhwuojdMPxw6Ax Eukq2RQw00Db3rDeFvQhRneiIr5tO2R7CETxACb7a67Gipwn6YpmzdOvqir+URiIn4qL sVZ61pUvRZ2DPV5AOXLZRz8lgX7W1nJhuptPcpA4saol6HOFG2DjvDDMdKi8qGBzdBcG E0Kjpqra63vyTPklkPYt+9Q2qcBul3/s6vkhn8VyPy8d5EFES+kck15pXUpnjTERljZu uXHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728826622; x=1729431422; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=gmfNtlhDZxf6uNMX99BP4SuNrA4xWBxdOzxZsCWPQiw=; b=jvexA4/chzHjfrYYKe/AN4C3ocUFtap/lJ5kiKDj7x2Gb59EM5FkUa+1nAohwwKHf0 YRI9C9TujO2/zvm1fa1hwZZerIzbouXLyZSHQeUQbMKv5UfzOAysA4q9H/P2365uL204 qQS+Xy6vBxcmA2IGPESCNtwiwk/Ce1mkUK9hvwgMv+78CAmxN+yCVQJ9g+lSNsZM3k2L nFYfeJOsv9DKATPcQ4f2ytuNJL/2f74kxWfeVRDGpWlGrB0oAmAfpPFR1Kb3ejDdRziZ F7baZjk6KdEs1UJbxS+KICSnk8X7DTHt5FXi6YnPLxa/qREkFOhp+/pkUa0Kd3qz5FFR R1Kg== X-Gm-Message-State: AOJu0Yws0fEmc9Pn78k+eYxWFR2TGGIMTE1Qa+Ld/SMOpmgTiKFqsDG/ oyoUIA5R3G+ffrIuvAeuNNS7tgZ/UG118+nM/KM+QHgRuL1wliE3Uj2q563QHmTzgHdXfaOgdqd 8WuAvjyrd+COxgj02bnjDKY1C/28aXQ== X-Google-Smtp-Source: AGHT+IHcmsjWmFLLgIeU5ASXx50fiLZ9ZaGNEokFBsqPKT0kDh5JRLPcsm75AgFE87VbnAJbxA+ajYiTCoRcUJ7xag4= X-Received: by 2002:a05:6870:b252:b0:26c:64f8:d6c4 with SMTP id 586e51a60fabf-28887472a8amr2759986fac.38.1728826621754; Sun, 13 Oct 2024 06:37:01 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Sun, 13 Oct 2024 07:36:50 -0600 Message-ID: Subject: Re: [FlyRotary] Re: RV-9A w13B Update To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="000000000000ab03eb06245bd069" X-SPAM-LEVEL: Spam detection results: 0 BAYES_00 -1.9 Bayes spam probability is 0 to 1% DKIM_SIGNED 0.1 Message has a DKIM or DK signature, not necessarily valid DKIM_VALID -0.1 Message has at least one valid DKIM or DK signature DKIM_VALID_AU -0.1 Message has a valid DKIM or DK signature from author's domain DKIM_VALID_EF -0.1 Message has a valid DKIM or DK signature from envelope-from domain DMARC_PASS -0.1 DMARC pass policy FREEMAIL_ENVFROM_END_DIGIT 0.25 Envelope-from freemail username ends in digit FREEMAIL_FROM 0.001 Sender email is commonly abused enduser mail provider GB_FREEMAIL_NUM 1 Freemail spammy address HTML_MESSAGE 0.001 HTML included in message RCVD_IN_DNSWL_NONE -0.0001 Sender listed at https://www.dnswl.org/, no trust RCVD_IN_MSPIKE_H2 -1.255 Average reputation (+2) SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record T_REMOTE_IMAGE 0.01 Message contains an external image --000000000000ab03eb06245bd069 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Actually, if you look at a number of Burt Rutan's planes (tractor, not pusher) he uses top exit cooling, as Charlie said, the exits were near the front of the cowl which is a low pressure area. The Catbird and the Grizzly in particular had only top exit. On Sat, Oct 12, 2024 at 11:27=E2=80=AFPM David Leonard wdleonard@gmail.com = < flyrotary@lancaironline.net> wrote: > also, invariably there is oil mist in out air that goes through the cowl > and it would probably pretty quickly start getting all over your windscre= en > and would be continuous PTA to clean it all the time > > On Sat, Oct 12, 2024, 9:24=E2=80=AFPM Rob McMillan robmcmillanpls@gmail.c= om < > flyrotary@lancaironline.net> wrote: > >> Ah! Yeah, my F4U time is pretty limited... (But I am willing to fly one >> in case anybody is willing to loan me one!). I wasn't thinking of cowl >> flaps on top, but louvers that would be pretty much flush... >> >> It was the windshield slope pressure increase that I wasn't thinking >> about! >> >> I really appreciate the great info shared in these emails! >> >> Thank you! >> >> Rob >> >> On Sat, Oct 12, 2024, 5:17=E2=80=AFPM Charlie England ceengland7@gmail.c= om < >> flyrotary@lancaironline.net> wrote: >> >>> If you're talking about putting the exit there, it would have to be nea= r >>> the front of the cowl, near the prop. (Been done with a/c engines; see = Garrison >>> Melmoth 2 >>> ). >>> But as you get closer to the windshield, external pressure goes way up,= so >>> the air would try to go *down* instead of up. >>> >>> >>> >>> Virus-free.www.avast.com >>> >>> <#m_3515475279745736576_m_2314378902410756534_m_1139761703917254549_DAB= 4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>> >>> On Sat, Oct 12, 2024 at 2:38=E2=80=AFPM Rob McMillan robmcmillanpls@gma= il.com < >>> flyrotary@lancaironline.net> wrote: >>> >>>> Dumb Question here! >>>> >>>> Why don't we put cooling on the top of the cowl? >>>> >>>> Seems like the heat would come out better... >>>> >>>> >>>> On Sat, Oct 12, 2024, 11:50=E2=80=AFAM David COOK hoursaway1@comcast.n= et < >>>> flyrotary@lancaironline.net> wrote: >>>> >>>>> Cowl on for cooling tests. We had good #s with it off then found not >>>>> enough airflow with cowl on and had to add some out-venting to the bo= ttom >>>>> of the cowl with simple SS marine louvers. David >>>>> >>>>> On 10/11/2024 9:15 PM EDT Doug Lomheim rv9flyer13b@gmail.com < >>>>> flyrotary@lancaironline.net> wrote: >>>>> >>>>> >>>>> I now have 4.2 hrs. of ground run time on the 13B I rebuilt in >>>>> Feb/Mar, and will now drop the oil and replace with Mobile One and ke= ep >>>>> exploring the upper limits of the power band! I got a bit carried aw= ay >>>>> today and pushed it up to 25 inches, and had to go full rich, so will= have >>>>> to tweak the EC2 some more above 16 inches. So far I=E2=80=99m very = happy with the >>>>> temps while doing the ground runs, and with OATs from 90-95 degrees, = the >>>>> max water temp has been 178 degrees, and oil temp only 148. I=E2=80= =99ve been able >>>>> to run 30 minutes straight without a cowling, without any temp issues= , so >>>>> am wondering if I=E2=80=99m going to be too cool once I start flying = it?? :) >>>>> >>>>> Doug >>>>> >>>>> [image: IMG_9906.jpg] >>>>> >>>>> --000000000000ab03eb06245bd069 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Actually, if you look at a number of Burt Rutan's plan= es (tractor, not pusher) he uses top exit cooling, as Charlie said, the exi= ts were near the front of the cowl which is a low pressure area. The Catbir= d and the Grizzly in particular had only top exit.

On Sat, Oct 12, 2024 at 1= 1:27=E2=80=AFPM David Leonard wdleon= ard@gmail.com <flyrot= ary@lancaironline.net> wrote:

also, invariably there is oil mist in o= ut air that goes through the cowl and it would probably pretty quickly star= t getting all over your windscreen and would be continuous PTA to clean it = all the time


On Sat= , Oct 12, 2024, 9:24=E2=80=AFPM Rob McMillan robmcmillanpls@gmail.com <flyrotary@lancaironl= ine.net> wrote:
Ah! Yeah, my F4U time is pretty limited... (But I = am willing to fly one in case anybody is willing to loan me one!). I wasn&#= 39;t thinking of cowl flaps on top, but louvers that would be pretty much f= lush...=C2=A0

It was the winds= hield slope pressure increase that I wasn't thinking about!

I really appreciate the great info = shared in these emails!

= Thank you!

Rob

On S= at, Oct 12, 2024, 5:17=E2=80=AFPM Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net> wrote:
If you're talking about putting = the exit there, it would have to be near the front of the cowl, near the pr= op. (Been done with a/c engines; see Garri= son Melmoth 2). But as you get closer to the windshield, external press= ure goes=C2=A0way up, so the air would try to go *down* instead of up.

3D""Virus-free.www.avast.com

On Sat, Oct 12, 2024 at 2:38=E2=80=AFPM Rob McMillan robm= cmillanpls@gmail.com <flyrotary@lancaironline.ne= t> wrote:
Dumb Question here!=C2=A0

Why don't we put cooling on the top of the cowl?

Seems like the heat would come = out better...


On Sat, Oct 12, 2024, 11:50= =E2=80=AFAM David COOK hoursaway1@comcast.net <flyrotary@lancaironline.net> wrote:
=20 =20 =20
Cowl on for cooling= tests. We had good #s with it off then found not enough airflow with cowl = on and had to add some out-venting to the bottom of the cowl with simple SS= marine louvers. David
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On 10/11/2024 9:15 PM EDT Doug Lomheim rv9flye= r13b@gmail.com <flyrotary@lancairon= line.net> wrote:
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I now have 4.2 hrs. of ground run time = on the 13B I rebuilt in Feb/Mar, and will now drop the oil and replace with= Mobile One=C2=A0and keep exploring the upper limits of the power band!=C2= =A0 I got a bit carried away today and pushed it up to 25 inches, and had t= o go full rich, so will have to tweak the EC2 some more above 16 inches.=C2= =A0 So far I=E2=80=99m very happy with the temps while doing the ground run= s, and with OATs from 90-95 degrees, the max water temp has been 178 degree= s, and oil temp only 148.=C2=A0 I=E2=80=99ve been able to run 30 minutes=C2= =A0straight=C2=A0without a cowling, without any temp issues, so am wonderin= g if I=E2=80=99m going to be too cool once I start=C2=A0flying it?? =C2=A0:= ) =C2=A0
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Doug=C2=A0
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=20 3D"IMG_9906.jpg"
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