"Matt Whiting" wrote

That was my point precisely. The water isn't IN the fuel. It is formed
by the fuel and the oxygen in the air via the combustion process. That
isn't at all the same as saying that the water is IN the fuel.

My misinterpretation. Sorry.

As far as water in the fuel as a contaminate, not a problem getting it to
burn, especially at the temps that occur inside a jet engine combustion
chamber. Any water in the fuel is very quickly evaporated, then there is no
problem getting the combustion to take place. The biggest problem (I'm
guessing) would be at startup, when temps are lower, initially. That all
changes in a hurry, as hot starts are a big thing to avoid.

A couple of things come to mind, when talking about water vapor in the
combustion chamber, which is what the water will be at these temperatures.
Air has a lot of water vapor in it, before it is compressed, and we all know
that works OK. Also, some engines, jet engines included (the Harrier is the
best know example) use water injection to control temperatures and add
efficiency. The Harrier uses a LOT of water, and although most people don't
know it, the water capacity is what determines how long the Harrier can
hover on each flight, because without water injection, the engine will
overheat.

To the other person that said there is not enough left over H to make water
with the O in the air, sorry, incorrect. Water and heat are two byproducts
of combustion. I wish I remembered enough chemistry to balance the
equation. No, I don't! g
--
Jim in NC