Which fuel has more energy, 110LL or 80/86 ?

Actually there may be no difference, or a slight one either way. Octane is a
measure of the "anti-knock" properties of a fuel.  A high power engine that
requires high octane has a higher compression ratio.  Burning high octane gas
in an engine that doesn't need it for anti-knock reasons is a waste of money.

Energy content per unit weight of fuel is a function of the carbon chain
length, i.e. kerosene > gasoline > butane > propane > methane.

Bill Schertz

 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org