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
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| Subject: | 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 2
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| Subject: | 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
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| Subject: | Temperature and other conversions |
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
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| Subject: | 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" <rv8vator@comcast.net>
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
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| Subject: | Re: Temperature and other conversions |
:-)
Me too.
JimC
----- Original Message -----
From: "Monty Barrett Sr" <MONTY@BPAENGINES.COM>
Sent: Tuesday, June 26, 2007 10:29 AM
Subject: RE: Engines-List: Temperature and other conversions
> <MONTY@BPAENGINES.COM>
>
> 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
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| Subject: | Re: 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" <cubflyr@comcast.net>
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
>
>
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