AviationBanter - View Single Post

**clare at snyder.on.ca**

On Fri, 22 Jun 2007 18:46:05 -0700, wrote:

On Jun 3, 10:50 pm, nrp wrote:
an easy way to have a line freeze and turn the plane into a glider.

Then why don't cars have line freezing trouble with E-10 gas? Here in
Minnesota, gas line freezeups have essentially disappeared because of
the mandated E-10. It is the only good thing about gasahpol
though...........

I think a major reason not to use E-10 in certificated aircraft is the
~5% power reduction.

Alcohol is an emulsifier that keeps water mixed with gasoline. It is
also an antifreeze that supresses the freezing temperature of water.
If you have a car that has ice in the fuel line, adding alcohol will
melt
it.
And adding a bit more water makes the water and alky drop out od
suspension. Called Phase Separation. It's temperature sensitive, so in
a plane at ground level you may still have gasahol, but at 4000 feet,
you are about 16 degrees F. colder - and that may be enough to trip
the phase separation. Bad Ju-Ju when the engine gets a gulp of watered
down hooch when it's expecting gasoline.

On 2 stroke engines (ultralights, snowmobiles etc) when this happens
the engine not only looses fuel, but it looses lubrication too,
because the separated hooch has no oil in it. It's at the bottom of
the tank, where the pickup is, so pistons are often destroyed before
the driver/pilot even knows he has a problem.

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