X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost03.isp.att.net ([207.115.11.53] verified) by logan.com (CommuniGate Pro SMTP 5.2c2) with ESMTP id 2471230 for flyrotary@lancaironline.net; Wed, 14 Nov 2007 00:00:08 -0500 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.53; envelope-from=bobperk90658@bellsouth.net Received: from fwebmail08.isp.att.net ([204.127.218.108]) by bellsouth.net (frfwmhc03) with SMTP id <20071114045933H0300m8cs2e>; Wed, 14 Nov 2007 04:59:33 +0000 X-Originating-IP: [204.127.218.108] Received: from [74.249.244.229] by fwebmail08.isp.att.net; Wed, 14 Nov 2007 04:59:32 +0000 From: bobperk90658@bellsouth.net To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Rebutal to the rebutal {:>) Thick vs Thin was : Diffuser Configuration Comparison Date: Wed, 14 Nov 2007 04:59:32 +0000 Message-Id: <111420070459.6461.473A80B40009B0DD0000193D22230703729B0A02D2089B9A019C04040A0DBFC7059D0A9F0D010D@att.net> X-Mailer: AT&T Message Center Version 1 (Oct 30 2007) X-Authenticated-Sender: Ym9icGVyazlAYmVsbHNvdXRoLm5ldA== MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_6461_1195016372_0" --NextPart_Webmail_9m3u9jl4l_6461_1195016372_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit George and All, I would have attached this little program that I keep on my desk top, but it was to big for the server. Convert, it is useful in a lot of ways, you can even customize calculations if you want. You can down load it from here. http://joshmadison.com/software/convert/ Its free Bob Perkinson -------------- Original message from "George Lendich" : -------------- Ed, Understanding your concerns, I have searched the net and confirmed that 1HP = 746 Watts and 1Btu= 0.293 watts, therefore 746/0.293 =2546 btu/hr=1hp. 2546/60 = 42.43 ( 3 recurring).btu/min. Same site gave 42.44 btu/min. So the 42.5 is my rule of thumb, but anyone can use it if they want. So your 5,000 Btu's ( water only) for 175hp must have been fairly accurate( good memory). I wanted to know Btu's per min/per Hp, as I assume that Radiator suppliers/ manufacturers need that info to confirm sizes of cores etc. On another tack there is a rule of thumb that the first 1/2 of the Rad does 3/4 of the cooling - is there some truth to that claim? George (down under) --NextPart_Webmail_9m3u9jl4l_6461_1195016372_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

George and All,

I would have attached this little program that I keep on my desk top, but it was to big for the server. Convert, it is useful in a lot of ways, you can even customize calculations if you want. You can down load it from here. http://joshmadison.com/software/convert/ Its free

Bob Perkinson

-------------- Original message from "George Lendich" <lendich@optusnet.com.au>: --------------

Ed,

Understanding your concerns, I have searched the net and confirmed that 1HP = 746 Watts and 1Btu= 0.293 watts, therefore 746/0.293 =2546 btu/hr=1hp.

2546/60 = 42.43 ( 3 recurring).btu/min.

Same site gave 42.44 btu/min.

So the 42.5 is my rule of thumb, but anyone can use it if they want.

So your 5,000 Btu's ( water only) for 175hp must have been fairly accurate( good memory).

I wanted to know Btu's per min/per Hp, as I assume that Radiator suppliers/ manufacturers need that info to confirm sizes of cores etc.

On another tack there is a rule of thumb that the first 1/2 of the Rad does 3/4 of the cooling - is there some truth to that claim?

George (down under)

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