In article , Paul Sengupta wrote:
"Janne Blomqvist" wrote in message
...
In article , Bob Fry wrote:
Other questions: Doesn't ethanol have less energy / volume than
gasoline?

Yes, it's heating value is about 2/3 that of gasoline.
:
When oil supplies dwindle, the price will increase. At
the same time, more efficient ways of biofuel production are
developed.

Question...how does the specific energy of corn oil compare with
Jet-A1 run in a diesel engine?

I guess you mean biodiesel, which is produced from vegetable oils such
as soy, rapeseed or from animal fats. Ethanol is produced from corn,
but I've never heard about "corn oil".

The (higher) heating value of fuels is approximately (quick googling,
correct if I'm wrong)

kerosene (Jet A-1) 46 MJ/kg
diesel 46.1 MJ/kg
gasoline 48 MJ/kg
ethanol 29.7 MJ/kg
biodiesel 40 MJ/kg


Tesco Supermarkets here in the UK now sell an "Ecodiesel"...it
has all of 5% biodiesel and costs 1p a litre more than their city
(reduced sulphur) diesel.

The reason jets use kerosene instead of diesel is that diesel freezes
at higher temperatures than kerosene. Biodiesel is even worse in this
regard. Not nice if your tanks freeze solid on a high altitude
flight..

See

http://www.biodiesel.org/pdf_files/Cold%20Flow.PDF

and

http://www.biodiesel.org/markets/pre...tingReport.pdf


--
Janne Blomqvist