X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "Rob McMillan robmcmillanpls@gmail.com" Received: from pmg.Logan.com ([207.170.160.161] verified) by logan.com (CommuniGate Pro SMTP 6.4.0) with ESMTPS id 3619183 for flyrotary@lancaironline.net; Sun, 13 Oct 2024 00:24:32 -0400 Received: from pmg.Logan.com (localhost [127.0.0.1]) by pmg.Logan.com (Proxmox) with ESMTP id BB80B1B71E for ; Sun, 13 Oct 2024 00:24:32 -0400 (EDT) Received-SPF: pass (gmail.com ... _spf.google.com: Sender is authorized to use 'robmcmillanpls@gmail.com' in 'mfrom' identity (mechanism 'include:_netblocks.google.com' matched)) receiver=pmg.Logan.com; identity=mailfrom; envelope-from="robmcmillanpls@gmail.com"; helo=mail-ej1-f46.google.com; client-ip=209.85.218.46 Received: from mail-ej1-f46.google.com (mail-ej1-f46.google.com [209.85.218.46]) by pmg.Logan.com (Proxmox) with ESMTPS for ; Sun, 13 Oct 2024 00:24:32 -0400 (EDT) Received: by mail-ej1-f46.google.com with SMTP id a640c23a62f3a-a99cc265e0aso232806266b.3 for ; Sat, 12 Oct 2024 21:24:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1728793464; x=1729398264; 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=Lz+E0P5Cg5QUNKUwz0dFnZYR4yZVyRw0vDSwlZDScYg=; b=MdqMoUOG+ME7mYsZC90VDV10F2SHaj5Vfwlj9p9WtWbcsg7QqT2OO7fAKxn0Mg791r YFvMaXx3tzi05AvRoB8FUWXbwD9pnUW7xTUhkT4ZDNF+9FXQ3W1XfcymzEiCP+tYIKnf ccrcdlRyuFSI/fH92iaW4X+O//LZwKFOhphV3DXmTifhqz8chcfnVX+aCNZff/CEPu2J +K3zLVGsITZEBMN7gxwT/9cXO4yMTZ8h+Qem178tvyqvIVr1Yk4weDsZBmTctWxTUJ7c mi3PEqFUIr7a4NuBU4pZqYukYhgrKZl9dYkIjRf8Lq+hfhKec5BR0ofbEJ44g6Btxsza Wlgw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728793464; x=1729398264; 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=Lz+E0P5Cg5QUNKUwz0dFnZYR4yZVyRw0vDSwlZDScYg=; b=Upso2alq6NZUKXXw8sLVfIWcZGCaLY0B5qHtwY/HE/Vt9knH2/ume6fnC70M0+1Dz0 5E/isiu2MNO5fdqjLKoN854xmieIQ4T/JbJRMqXcsmyoKULaWFjD6nAZPuzgCcVvMmm6 1HXIyfsHOfdO0gideebOetmNvHGoRCw+p2sEbiFELvMArDZAFBxPhKZd+5j73cnfvPp7 X3HUisfxAV3If2615fX+nfBYn2mrqHXoTQ96LDwJ9EQOvxR5mn3qYXyFhXoBjkqhlS3a /8PIKoJJ5Py3q5ZSGzCSePteiSTNVeGMfKPxkVhBhajSnVf46zqJX62OLL8PRAVPu/sr en6Q== X-Gm-Message-State: AOJu0Yza6iJNVWPbpag28K1DJolJvTWQ7JpJ6pf0nC30hnCfvK/SoDCd f0kckGNA4yiXIEBFL/UfY1HhHBFYzeKtQqNREdCL5jvIhz5qofdTe3Vf/HMlGThFnl2fV1bJBXU mK5+ufYyKAXTCYDMc2cAX/ZZI+PXJVw== X-Google-Smtp-Source: AGHT+IEoV9fJmvWAGi+kKFN/bOhgPofA4VUddghtbFrc93AhuWkD+g5Mxqlde4ws3UlWuYWNpO5SaYPV9N8bHoIdWUE= X-Received: by 2002:a17:907:7246:b0:a99:eb94:3e37 with SMTP id a640c23a62f3a-a99eb948aaamr292914766b.58.1728793464068; Sat, 12 Oct 2024 21:24:24 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Sat, 12 Oct 2024 21:24:12 -0700 Message-ID: Subject: Re: [FlyRotary] Re: RV-9A w13B Update To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="00000000000050e13c062454181e" X-SPAM-LEVEL: Spam detection results: 0 AWL 1.201 Adjusted score from AWL reputation of From: address 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_FROM 0.001 Sender email is commonly abused enduser mail provider 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_H3 0.001 Good reputation (+3) RCVD_IN_MSPIKE_WL 0.001 Mailspike good senders 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 --00000000000050e13c062454181e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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.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 prop. (Been done with a/c engines; see Ga= rrison > Melmoth 2 > ). > But as you get closer to the windshield, external pressure goes way up, s= o > the air would try to go *down* instead of up. > > > > Virus-free.www.avast.com > > <#m_1139761703917254549_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > On Sat, Oct 12, 2024 at 2:38=E2=80=AFPM Rob McMillan robmcmillanpls@gmail= .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.net= < >> 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 bott= om >>> 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 keep explorin= g >>> the upper limits of the power band! I got a bit carried away today and >>> pushed it up to 25 inches, and had to go full rich, so will have to twe= ak >>> 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 b= een 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] >>> >>> --00000000000050e13c062454181e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Ah! Yeah, my F4U time is pretty limited... (But I am will= ing to fly one in case anybody is willing to loan me one!). I wasn't th= inking of cowl flaps on top, but louvers that would be pretty much flush...= =C2=A0

It was the windshield s= lope pressure increase that I wasn't thinking about!

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

Thank y= ou!

Rob

<= div class=3D"gmail_quote">
On Sat, 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 prop. (Been done with a/c e= ngines; see Garrison Melmoth 2). But as you get c= loser to the windshield, external pressure goes=C2=A0way up, so the air wou= ld 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 robmcmillanpls@gmail.com <flyrotary@lancair= online.net> wrote:
Dumb Question here!=C2=A0
Why don't we put cooling on the top of the cow= l?

Seems like the heat w= ould come out better...


On Sat, Oct 12, 20= 24, 11:50=E2=80=AFAM David COOK hoursaway1@comcast.net <flyrotary@lancaironline.net> wrote:
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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 rv9flyer13b@gmail.= com <flyrotary@lancaironline.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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