---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Tue 06/26/07: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:10 AM - Re: Re: Easy - too easy (Martin Sobel) 2. 09:18 AM - Temperature and other conversions (Michael) 3. 09:26 AM - Re: Temperature and other conversions (Monty Barrett Sr) 4. 12:40 PM - Re: Re: Easy - too easy (jrc) 5. 12:41 PM - Re: Temperature and other conversions (jrc) 6. 05:39 PM - Re: Temperature and other conversions (Gene Smith) ________________________________ Message 1 _____________________________________ Time: 08:10:45 AM PST US Subject: Re: Engines-List: Re: Easy - too easy From: Martin Sobel You guys are arguing from the standpoint that the formula is an approximation. It is an exact conversion, Why? Because between freezing and boiling there are 100 Centigrade degrees and 180 Fahrenheit degrees. The ratio is 9/5. Centigrade freezing starts at "0" Fahrenheit starts at 32. So lets convert 20 C to Fahrenheit . 20 x 9/5 = 36 (The number of Fahrenheit degrees) since Fahrenheit begins at 32 adding 32 to 36 gives us 68F. Doubling 20 and subtracting 10 percent is just an easier way than multiplying by 9 and dividing by 5. Martin Sobel ________________________________ Message 2 _____________________________________ Time: 09:18:53 AM PST US From: "Michael" Subject: Engines-List: Temperature and other conversions OK: is this horse dead yet?? When I am flying and it is 32C ambient air temperature, I can look at my little yellow gizzy from AOPA and see approximately how hot it is (darn) in Fahrenheit, or use a rule-of-thumb conversion of some caliber. Do I usually need to know EXACTLY? No. I am cruising, showing 152 knots on my GPS. Do I usually need to know EXACTLY what that converts to (fast) in MPH? No. If I need to know EXACTLY, I will use the formulas I learned in high school chemistry class and navigation class, which have been discussed here. If I just need to know "about" how hot, cold or fast it is, which is usually the case, I use a fast and SIMPLE rule of thumb. NOW: let's talk ENGINES around here..................... Michael Do not archive, which should be on all this yammering ________________________________ Message 3 _____________________________________ Time: 09:26:26 AM PST US Subject: RE: Engines-List: Temperature and other conversions From: "Monty Barrett Sr" O-O-O-O- "--lets talk about engines around here ". Engines work with absolute temperatures. This opens up a whole new conversion conversation, which I am going to avoid in this forum. Monty Barrett Barrett Precision Engines, Inc. -----Original Message----- From: owner-engines-list-server@matronics.com [mailto:owner-engines-list-server@matronics.com] On Behalf Of Michael Sent: Tuesday, June 26, 2007 10:18 AM Subject: Engines-List: Temperature and other conversions OK: is this horse dead yet?? When I am flying and it is 32C ambient air temperature, I can look at my little yellow gizzy from AOPA and see approximately how hot it is (darn) in Fahrenheit, or use a rule-of-thumb conversion of some caliber. Do I usually need to know EXACTLY? No. I am cruising, showing 152 knots on my GPS. Do I usually need to know EXACTLY what that converts to (fast) in MPH? No. If I need to know EXACTLY, I will use the formulas I learned in high school chemistry class and navigation class, which have been discussed here. If I just need to know "about" how hot, cold or fast it is, which is usually the case, I use a fast and SIMPLE rule of thumb. NOW: let's talk ENGINES around here..................... Michael Do not archive, which should be on all this yammering ________________________________ Message 4 _____________________________________ Time: 12:40:31 PM PST US From: "jrc" Subject: Re: Engines-List: Re: Easy - too easy Ummh, no. I think I specifically said that doubling less 10% was an exact conversion. Some of the other guys prefer using approximations. I agree with you. JimC ----- Original Message ----- From: "Martin Sobel" Sent: Tuesday, June 26, 2007 9:08 AM Subject: Re: Engines-List: Re: Easy - too easy > > You guys are arguing from the standpoint that the formula is an > approximation. It is an exact conversion, Why? > > Because between freezing and boiling there are 100 Centigrade degrees and > 180 Fahrenheit degrees. The ratio is 9/5. Centigrade freezing starts at > "0" > Fahrenheit starts at 32. > > So lets convert 20 C to Fahrenheit . > > 20 x 9/5 = 36 (The number of Fahrenheit degrees) since Fahrenheit begins > at > 32 adding 32 to 36 gives us 68F. > > Doubling 20 and subtracting 10 percent is just an easier way than > multiplying by 9 and dividing by 5. > > Martin Sobel > > > ________________________________ Message 5 _____________________________________ Time: 12:41:24 PM PST US From: "jrc" Subject: Re: Engines-List: Temperature and other conversions :-) Me too. JimC ----- Original Message ----- From: "Monty Barrett Sr" Sent: Tuesday, June 26, 2007 10:29 AM Subject: RE: Engines-List: Temperature and other conversions > > > Engines work with absolute temperatures. This opens up a whole new > conversion conversation, which I am going to avoid in this forum. > > Monty Barrett > Barrett Precision Engines, Inc. > > -----Original Message----- > From: owner-engines-list-server@matronics.com > [mailto:owner-engines-list-server@matronics.com] On Behalf Of Michael > Sent: Tuesday, June 26, 2007 10:18 AM > To: engines-list@matronics.com > Subject: Engines-List: Temperature and other conversions > > > OK: is this horse dead yet?? > > When I am flying and it is 32C ambient air temperature, I can look at my > little yellow gizzy from AOPA and see approximately how hot it is (darn) > in > Fahrenheit, or use a rule-of-thumb conversion of some caliber. Do I > usually > need to know EXACTLY? No. I am cruising, showing 152 knots on my GPS. Do > I > usually need to know EXACTLY what that converts to (fast) in MPH? No. If > I > need to know EXACTLY, I will use the formulas I learned in high school > chemistry class and navigation class, which have been discussed here. If > I > just need to know "about" how hot, cold or fast it is, which is usually > the > case, I use a fast and SIMPLE rule of thumb. > > NOW: let's talk ENGINES around here..................... > > Michael > > Do not archive, which should be on all this yammering > > > ________________________________ Message 6 _____________________________________ Time: 05:39:06 PM PST US From: "Gene Smith" Subject: Re: Engines-List: Temperature and other conversions Please do not archive! Youse guys are acting like a bunch of grade school kids. I have a nice conversion chart in my wallet, and one in my flying machine, takes about 5 seconds to convert either way...All the stuff you are proposing, requires too much brain power for me, however, I enjoyed reading all the different methods........CHEERS!!!! Gene Smith RV-4 13yrs flying Please do not archive! ----- Original Message ----- From: "Michael" Sent: Tuesday, June 26, 2007 11:18 AM Subject: Engines-List: Temperature and other conversions > > OK: is this horse dead yet?? > > When I am flying and it is 32C ambient air temperature, I can look at my > little yellow gizzy from AOPA and see approximately how hot it is (darn) in > Fahrenheit, or use a rule-of-thumb conversion of some caliber. Do I usually > need to know EXACTLY? No. I am cruising, showing 152 knots on my GPS. Do I > usually need to know EXACTLY what that converts to (fast) in MPH? No. If I > need to know EXACTLY, I will use the formulas I learned in high school > chemistry class and navigation class, which have been discussed here. If I > just need to know "about" how hot, cold or fast it is, which is usually the > case, I use a fast and SIMPLE rule of thumb. > > NOW: let's talk ENGINES around here..................... > > Michael > > Do not archive, which should be on all this yammering > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message engines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Engines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/engines-list Browse Digests http://www.matronics.com/digest/engines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.