"Roger (K8RI)" wrote:
Barnyard BOb wrote:
"Roger (K8RI)" wrote:
A more relevant number is the BTUs per gallon which translaes into MPG
for a given engine.
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Roger,
You are very, very late to this party.
I've been following the thread Bob, but the only thing I could find
relevant is energy per unit. The only time I care about weight or spg
is when figuring out how much I can carry. :-0)
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Hi Roger,
Do these old posts of mine not address your topic of concern?
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MAY 29, 2007
From Wikipedia, the free encyclopedia:
Energy content
Gasoline contains about 34.6 megajoules per litre (MJ/l) or 131 MJ/US
gallon. This is an average, gasoline blends differ, therefore actual
energy content varies from season to season and from batch to batch,
as much as 4% more or less than the average, according to the US EPA.
Fuel type BTU/US gal Research octane
Regular Gasoline 125,000 Min 91
Aviation gasoline 120,200
BTU/US gal
Gasohol (10% ethanol + 90% gasoline) 120,900
( Research octane) 93/94
- Barnyard BOb -
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MAY 29, 2007
Peter,
After reading your earlier post and having held similar views for
many years, I thought something like this might be of interest.
FWIW, my rule of thumb...
The cruder the fuel, the more btu/gal.
i.e., diesel blows away gasoline @ 138,700 btu/gal
Jet Fuel: Kerosene* 125,800 btu/gal
*Chevron Products Company 2000
- Barnyard BOb - the devil's in the details
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MAY29, 2007
Jerry,
Your ORIGINAL ARGUEMENT WAS....
"Hate to disagree. but there are more BYU's in a GALLON of Avgas than
in a GALLON of Mogas. Why?? Avgas weighs more per Gallon..."
Weight of fuel is irrelevant when it comes to btu/gal....
assuming your BYU reference was meant to be btu.
Btu/gal is a VOLUME measurement, not one of weight.
Thank you for your time and patience.
- Barnyard BOb -
Jerry,
Your ORIGINAL ARGUEMENT WAS....
"Hate to disagree. but there are more BYU's in a GALLON of Avgas than
in a GALLON of Mogas. Why?? Avgas weighs more per Gallon..."
Weight of fuel is irrelevant when it comes to btu/gal....
assuming your BYU reference was meant to be btu.
Btu/gal is a VOLUME measurement, not one of weight.
Thank you for your time and patience.
- Barnyard BOb -
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MAY 29, 2007
Jerry,
I have purposely distanced myself from weight specifics
since my sources state energy content BY VOLUME,
which is the convenient way we buy fuel at the pump.
Found another web site stating values by GALLON, not weight.
[No idea how accurate these values are.]
http://www.jwiwood.com/faq/conversion.html
Too bad they make no reference to avgas.
For grins.....
1 gallon of crude oil ... 138,095 Btu
1 gallon of kerosene or light distillate oil ... 135,000 Btu
1 gallon middle distillate or diesel fuel oil ... 138,690 Btu
1 gallon residential fuel oil ... 149,690 Btu
1 gallon of gasoline ... 125,000 Btu
1 gallon of ethanol ... 84,400 Btu
P.S.
If these figures are reasonably accurate...
It takes MORE than a gallon of crude to produce a gallon of diesel.
Double ditto for residential fuel oil.
- Barnyard BOb -