X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f182.google.com ([209.85.221.182] verified) by logan.com (CommuniGate Pro SMTP 5.2.15) with ESMTP id 3769487 for flyrotary@lancaironline.net; Wed, 22 Jul 2009 20:18:45 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.221.182; envelope-from=rwstracy@gmail.com Received: by qyk12 with SMTP id 12so770204qyk.7 for ; Wed, 22 Jul 2009 17:18:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to :content-type; bh=4I/dnE8V78IFX5CmBzK57Pl/x2k9xky4aOVI1Guv66w=; b=ReSLfD3sXjyt5vHKncxqkM7uOwh67I5Q2SV+04wmmXQ/AKR1+eWb8lu9OkV7K2qobU fSfR9bu85F+vGpVOr+Qvbs1FWVpApbJsWfgptH66vF1uXDbCRuaNFtOc/yS6P/RDlmlH u6Fs/C2ijXbJJWsoVdVpUWJyjGeso/DXPxhDU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=Jvzvkc2PBNMdNV5tx9VMG4HEEP49GVX1mGJHEhPqgO+Hvu28Qv3hX83aqXGOK5M6BC ngXdsANG0Fyvrqs9zOA4EjLdbyEJI+Gu54LGpnvtaa73Hp/Fr4pDaywX4Wkmy4zuiAP4 V0YGtbC6g8KwQ3FEBPT4LY2aLmr9sAWgxaTaE= MIME-Version: 1.0 Sender: rwstracy@gmail.com Received: by 10.224.19.129 with SMTP id a1mr1404035qab.359.1248308290628; Wed, 22 Jul 2009 17:18:10 -0700 (PDT) In-Reply-To: References: Date: Wed, 22 Jul 2009 20:18:10 -0400 X-Google-Sender-Auth: ed7d195a6061040c Message-ID: <1b4b137c0907221718s5f8f537dx48217d1258519ca1@mail.gmail.com> Subject: Re: [FlyRotary] Re: Water spray supplimental cooling From: Tracy Crook To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175cb2c23bab94046f546cf3 --0015175cb2c23bab94046f546cf3 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Just for a data point, In the 2003 Sun 100 I used about 3 gallons of water to cool the oil during the 28 minutes I was at full throttle. Flow rate was a bit excessive and it was not well distributed over the core so this number could be improved on. The oil was plenty cool though (~190 F during race on a warm day). Had a cooler day in 2004 so didn't need the water spray but turned it on during last 20 miles just to see the effect. Dropped oil temps about 25 - 30 degrees. Tracy On Wed, Jul 22, 2009 at 3:07 PM, Dennis Haverlah wrote: > I'm still contemplating installing a water spray for use during high power > climb-out. I used Ed's cooling spread sheet and estimated I need about 200 > Btu/minute additional oil cooling during climb.. I also calculated that 5 > qts of oil need about 288 Btu to gain 40 deg. F during the first 2 minutes > of take-off and climb This translates to about 150 Btu/ minute. I believe > I need about 200 Btu/minute additional cooling to keep my oil cool on a 100 > + deg. day. > The Latent Heat of Evaporation for water is 970 Btu/# or 8050 Btu/gal. For > a 10 minute climb I'd need 200 Btu X 10 or 2000 Btu. This is approximately > 1 Qt or 32 oz/10 minutes. My water flow rate would than be 3.2 oz/minute. > > I found some "misting" spray nozzles at Home Depot and found they work well > at 30 psi. I have a 12 V Schure RV water pump that can be used for initial > testing. > > Next week the afternoon temperatures will be above 100 deg again. I hope > to get the water mister installed so I can try it. > > If the medical water pumps David Leonard has will provide 30 psi or more > I'd be interested in trying them. > > Dennis Haverlah > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --0015175cb2c23bab94046f546cf3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Just for a data point, In the 2003 Sun 100 I used about 3 gallons of water = to cool the oil during the 28 minutes I was at full throttle.=A0=A0 Flow ra= te was a bit excessive and it was not well distributed over the core so thi= s number could be improved on.=A0 The oil was plenty cool though (~190 F du= ring race on a warm day).=A0 Had a cooler day in 2004 so didn't need th= e water spray but turned it on during last 20 miles just to see the effect.= =A0 Dropped oil temps about 25 - 30 degrees.=A0

Tracy

On Wed, Jul 22, 2009 at 3:07 PM= , Dennis Haverlah <clouduster@austin.rr.com> wrote:
I'm still contemplating installing a water spray for use during high po= wer climb-out. I used Ed's cooling spread sheet and estimated I need ab= out 200 Btu/minute additional oil cooling during climb.. =A0I also calculat= ed that 5 qts of oil need about 288 Btu to gain 40 deg. F during the first = 2 minutes of take-off and climb =A0This translates to about 150 Btu/ minute= . =A0I believe I need about 200 Btu/minute additional cooling to keep my oi= l cool on a 100 + deg. day.
The Latent Heat of Evaporation for water is 970 Btu/# or 8050 Btu/gal. =A0F= or a 10 minute climb I'd need 200 Btu X 10 or 2000 Btu. =A0This is appr= oximately =A01 Qt or 32 oz/10 minutes. =A0My water flow rate would than be = 3.2 oz/minute.

I found some "misting" spray nozzles at Home Depot and found they= work well at 30 psi. =A0I have a 12 V Schure RV water pump that can be use= d for initial testing.

Next week the afternoon temperatures will be above 100 deg again. =A0I hope= to get the water mister installed so I can try it.

If the medical water pumps David Leonard has will provide 30 psi or more I&= #39;d be interested in trying them.

Dennis Haverlah



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