X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) From: "Le Roux Breytenbach breytenbachleroux@gmail.com" Received: from mail-ej1-f51.google.com ([209.85.218.51] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 1261197 for flyrotary@lancaironline.net; Sun, 28 Feb 2021 01:12:52 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.51; envelope-from=breytenbachleroux@gmail.com Received: by mail-ej1-f51.google.com with SMTP id do6so22089390ejc.3 for ; Sat, 27 Feb 2021 22:12:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:in-reply-to:to; bh=N5BszCXeyJC37JjmUTABEqIVgPJgYm1jOncSMDmjPPo=; b=YL+5FgpkFp0N9it7kHI2n7tvl8YiPj9QYlP38eSLWsSUMHRDSoXcDef+hmlSSXywtY SEoE16Z6+BI5jrmzgKh0Kgk1ZILXNM/xnwYWEHNVZ8DrV1az/Ln4LGnVe4nO2kNCiDzG JyXl25alXkm5/yIO13WrGHBtTiJCmKztvX7lbNvITqr3UfcAvrpHAC3rsn0kUP/SG7t1 3qwK0jxyHp6hiIAMfMexeCR7NNuCkXx5E31K8kZa4helz741Bgj197qmNHozqFPLYuIv nKPRPnlwCqyHbNULqy7oSPvGC8lXySehKTQj626VAX1lV8PSliAb1tyIntPUYAg8lAUH KwYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:in-reply-to:to; bh=N5BszCXeyJC37JjmUTABEqIVgPJgYm1jOncSMDmjPPo=; b=iMapxYVzniY0OofvDxECP7Isv0v3+iY1RNgCqvEp4IR9ZI0aaZY+wQPVTu3uLUc89E cb/BaFsanvJrjJkF3NfFmNJY403nwu3hm0/tSDzw4bgxStvNPi0aXLG3l/dzrKYdUovq RlyLdPsho3+suC+kp6xOByrsL2dIvqVs7e+LeE/uRW+5E3/BRdet2lICHwdkV/qOvD7l ybnYJB7ZrcA3IZTPaYkrDRv0axUyJ/9L/1pZyAH2wzt84Ya973lSbx7ag24uj5mswwMz oiqx3nsAiag+6opVeuf0Hl5dACSTDzBw5VwwTwn2L/dm5C52GQLlQVuBOtRuZyAt85yi rv8A== X-Gm-Message-State: AOAM532mjU3JmNswmh8u7dteHThF6dAwiHKtnNSeMl9fZapswOgjgSab X4voQrrh/IT+2zQgyz8/YyKMlezLGIjy9w== X-Google-Smtp-Source: ABdhPJyQ3rAY5v+JtlvRg86TMenNVz3PcfQxqLnZ106pGXsXKfvGS6SWvHUBCgunnWHIn3LvsD4Hzw== X-Received: by 2002:a17:907:7014:: with SMTP id wr20mr10542456ejb.179.1614492755707; Sat, 27 Feb 2021 22:12:35 -0800 (PST) Return-Path: Received: from [192.168.1.122] ([160.226.139.191]) by smtp.gmail.com with ESMTPSA id h12sm9585311edb.70.2021.02.27.22.12.34 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 27 Feb 2021 22:12:35 -0800 (PST) Content-Type: multipart/alternative; boundary=Apple-Mail-663E4E86-6FF4-4E1B-BFAC-D9EDB2E23B53 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) Subject: Waterpump speed Date: Sun, 28 Feb 2021 08:12:33 +0200 Message-Id: References: In-Reply-To: To: Rotary motors in aircraft X-Mailer: iPhone Mail (17H35) --Apple-Mail-663E4E86-6FF4-4E1B-BFAC-D9EDB2E23B53 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable The waterpump at what rpm is a,safe operating speed, on the 13 B engine? If the engine is say on 6300 rpm continues setting. I must convert the waterpump pulley diameter now for operating rpm,s Any suggestions will be appreciated. Le Roux Sent from my iPhone Le Roux Breytenbach=20 > On 28 Feb 2021, at 06:30, Finn Lassen finn.lassen@verizon.net wrote: >=20 > =EF=BB=BF > Yep, inlet/outlets on rads are very, very restrictive. 7/64x1/2" (0.05 sqi= n or 1/4" diameter hole equivalent)) at best. I was aware of it when I JB-we= lded 5/8" and 3/4" over existing tubes and "just wanted to see how it would w= ork" and then forgot about it. >=20 > Drilling holes in tank end plates I also found a small tube inside one tan= k and baffles in both tanks. Now removed. >=20 > As for airflow, when I get new elbows welded onto the rads I'll collect ne= w data. I think the large delta is due to the very slow coolant flow -- stay= s in rads way too long (and thus not circulating through the engine fast eno= ugh). >=20 > Finn >=20 >> On 2/27/2021 9:32 PM, Steven W. Boese SBoese@uwyo.edu wrote: >> Finn, >>=20 >> If the "WTeng" sensor location is somewhere in the engine block and not a= t the coolant outlet and the "WTout" sensor is in the coolant exiting the en= gine, then the coolant flow rate through the system may need to be increased= by enlarging the radiator connections.=C3=AF=C2=BF=C2=BD Typically, it seem= s that at normal operating temps, the delta-T across the engine and across t= he radiators is about 15 deg F. >>=20 >> It also would appear that the mass air flow through the radiators may nee= d to be increased since the air delta T is quite large and the temp of the a= ir exiting the radiators is close to temp of the coolant exiting the radiato= rs.=C3=AF=C2=BF=C2=BD If your OAT were increased to 100 deg F, you could see= "WTout" of ~250 deg F with the setup as it is now. >>=20 >> The attached plots show the effect of changing only the air inlet and out= let areas of my system which has ~0.9" id plumbing to the single radiator.=C3= =AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD >>=20 >> FWIW >>=20 >> Steve Boese >>=20 >>=20 >>=20 >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Lis= t.html >=20 >=20 >=20 > =09 > This email has been checked for viruses by Avast antivirus software.=20 > www.avast.com >=20 >=20 --Apple-Mail-663E4E86-6FF4-4E1B-BFAC-D9EDB2E23B53 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable The waterpump at what rpm is a,safe operati= ng speed, on the 13 B engine?
If the engine is say on 6300 rpm continues= setting.
I must convert the waterpump pulley diameter now for ope= rating rpm,s

Any suggestions will be appreciated.

Le Roux



Sent from my iPhone
Le Roux Breytenbach 

On 28 Feb 2021, at 06:30, Finn Lassen fi= nn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:

=EF=BB=BF =20 =20 =20
Yep, inlet/outlets on rads are very, very restrictive. 7/64x1/2" (0.05 sqin or 1/4" diameter hole equivalent)) at best. I was aware of it when I JB-welded 5/8" and 3/4" over existing tubes and "just wanted to see how it would work" and then forgot about it.

Drilling holes in tank end plates I also found a small tube inside one tank and baffles in both tanks. Now removed.

As for airflow, when I get new elbows welded onto the rads I'll collect new data. I think the large delta is due to the very slow coolant flow -- stays in rads way too long (and thus not circulating through the engine fast enough).

Finn

On 2/27/2021 9:32 PM, Steven W. Boese SBoese@uwyo.edu wrote:
=20
Finn,

If the "WTeng" sensor location is somewhere in the engine block and not at the coolant outlet and the "WTout" sensor is in the coolant exiting the engine, then the coolant flow rate through the system may need to be increased by enlarging the radiator connections.=C3=AF=C2=BF=C2=BD Typically, it seems that at normal o= perating temps, the delta-T across the engine and across the radiators is about 15 deg F.

It also would appear that the mass air flow through the radiators may need to be increased since the air delta T is quite large and the temp of the air exiting the radiators is close to temp of the coolant exiting the radiators.=C3=AF=C2=BF=C2=BD If your OAT were increase= d to 100 deg F, you could see "WTout" of ~250 deg F with the setup as it is now.

The attached plots show the effect of changing only the air inlet and outlet areas of my system which has ~0.9" id plumbing to the single radiator.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD

FWIW

Steve Boese



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