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MichaelGibbs(at)cox.net
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 Posted: Thu Aug 17, 2006 11:42 pm Post subject: Ethanol and wing tanks Ethanol and wing tanks |
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Noel sez:
| Quote: | There are holes in your argument. First we are talking about a
rating not a ratio.
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It's not my "argument" Noel, it's the definition of "octane rating".
From Wikipedia <http://en.wikipedia.org/wiki/Octane>:
"...Octane ratings are ratings used to represent the anti-knock
performance of petroleum-based fuels (octane is less likely to
prematurely combust under pressure than heptane), given as the
percentage of 2,2,4-trimethylpentane in an 2,2,4-trimethylpentane /
n-heptane mixture that would have the same performance."
A "percentage" cannot exceed 100, by definition.
| Quote: | Pure ethanol has an octane rating of around 110.
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I am not an expert on fuels. Rather than argue with me, please read
these articles on octane ratings:
<http://www.chevron.com/products/prodserv/fuels/bulletin/aviationfuel/9_ag_specsandtest.shtm%3E>
<http://www.prime-mover.org/Engines/GArticles/octane.html>
Mike G.
N728KF
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Fri Aug 18, 2006 5:48 am Post subject: Ethanol and wing tanks Ethanol and wing tanks |
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Mike:
The first link to chevron was dead so it sent me to their search page. The
second page was a bit better and it said exactly what I've been saying on
this thread. Any fuel that has more resistance to detonation than octane
will have an octane rating higher than 100.
When I was in technical school I had the same argument over volatility and
octane rating. It was the opinion of my class mates that because high
octane fuels were more volatile than they were actually more explosive,
(would flash at a lower temp). I ended up doing a paper on the transitions
of the fuel in the various stages of compression to demonstrate why high
octane fuels were used in high compression engines and the flash points of
some readily available fuels
I guess to try to cut to the quick of it is that it looks to me that you are
trying to compare apples to oranges. They are both fruits, they are both
more or less spherical, they both grow on trees but they are very different.
Noel
[quote] --
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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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