Return-Path: Received: from bewersdorff.com ([192.220.83.90] verified) by logan.com (CommuniGate Pro SMTP 4.1) with SMTP id 2510399 for flyrotary@lancaironline.net; Sun, 03 Aug 2003 15:59:16 -0400 Received: (qmail 44337 invoked by uid 21338); 3 Aug 2003 19:58:59 -0000 Received: from unknown (HELO rapunzel) ([216.101.149.124]) (envelope-sender ) by 192.220.83.90 (qmail-ldap-1.03) with SMTP for ; 3 Aug 2003 19:58:59 -0000 From: "Marko Bewersdorff" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Cooling? Date: Sun, 3 Aug 2003 12:58:36 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0569_01C359BE.F3B59D90" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0569_01C359BE.F3B59D90 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit doesn't that formula depend on absolute temperature like kelvin or so? where zero degree is minus 459 degree F or minus 273 Celsius. the ratio of expansion should be something like: inlet air: 20 degree Celsius (68F) or 293 Kelvin outlet air: 50 degree celsius (122F) or 323 Kelvin then 323 over 293 for a change in temperature gives then the Volume change of more like 1.2 there is some additional expansion due to the pressure difference. Regards Marko I started finally welding my engine mount for my turbo rotary long ez here are a bunch of excel numbers: Inlet temp in degree: Outlet temp in degree: Change in F C K K C F volume 68 20 293 303 30 86 1.03 68 20 293 313 40 104 1.07 68 20 293 323 50 122 1.10 68 20 293 333 60 140 1.14 68 20 293 343 70 158 1.17 68 20 293 353 80 176 1.20 68 20 293 363 90 194 1.24 68 20 293 373 100 212 1.27 68 20 293 383 110 230 1.31 68 20 293 393 120 248 1.34 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Al Gietzen The ratio should be more like 1.6 to 1.8. Do the math - air expands directly proportional to temp - so in at about 80 F and out at about, say, 130 to 140; gives a ratio of 1.7. Al ------=_NextPart_000_0569_01C359BE.F3B59D90 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

doesn't that formula depend on absolute temperature = like kelvin=20 or so? where zero degree is minus 459 degree F or minus 273 = Celsius.
the=20 ratio of expansion should be something like:
inlet air: 20 degree = Celsius=20 (68F) or 293 Kelvin
outlet air: 50 degree celsius (122F) or 323=20 Kelvin
then
323 over 293 for a change in temperature gives
then = the=20 Volume change of more like 1.2

there is some additional expansion due to the pressure = difference.

 

Regards

Marko

I started finally welding my engine mount for my turbo = rotary=20 long ez

 
here are a bunch of excel numbers:
 

Inlet temp in=20 degree: Outlet temp in=20 degree: Change in
F C K K C F volume
68 20 293 303 30 86 1.03
68 20 293 313 40 104 1.07
68 20 293 323 50 122 1.10
68 20 293 333 60 140 1.14
68 20 293 343 70 158 1.17
68 20 293 353 80 176 1.20
68 20 293 363 90 194 1.24
68 20 293 373 100 212 1.27
68 20 293 383 110 230 1.31
68 20 293 393 120 248 1.34




-----Origin= al=20 Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironlin= e.net]On=20 Behalf Of Al Gietzen



The ratio should be more like 1.6 to = 1.8.  Do the math - air expands directly proportional to temp - so = in at=20 about 80 F and out at about, say, 130 to 140; gives a ratio of=20 1.7.

Al

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