Question about auto gas STC

Robert M. Gary wrote:
: I wouldn't bet a plug nickel on your last statement.


: I wish you'd bet more because I want to get a new GPS for my plane. I
: can only speak from years of owning a Chief with no mixture control.
: Shutting down (with mag switch) putting gas in, turning the mags back
: on, and turning the prop 1/8 turn (no starter), jumping in and flying
: away.

Certainly believable with impulse couplings. They fire *after* TDC, and are
spring-loaded to have good spark. If there's burnable fuel in the cylinder, a slow
prop turn past the mag *click* could certainly light it off.

--
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"Robert M. Gary" wrote:

"Dave Stadt" wrote in message gy.com...
"Robert M. Gary" wrote in message
om...

Just don't touch the prop aftewards (unless you want it to start).
When I had the Chief we had to shut it down with the mags. Usually a
20 degree turn on the prop was all we needed to hand start it. Now, if
some line guy were to "move" the prop, he'd have a hand full of his
hands (if the mags didn't ground). At least with a mixture airplane
you shouldn't have as much fireable fuel in the cylinders.

I wouldn't bet a plug nickel on your last statement.

I wish you'd bet more because I want to get a new GPS for my plane. I
can only speak from years of owning a Chief with no mixture control.

I think you should reconsider. The "last statement" there was something to the effect
that an aircraft with a mixture control wouldn't have much gas in the cylinders after
being shut down. While you are correct that it "shouldn't" have, Dave's point is that
it isn't a good idea to count on that being the case. He isn't about to bet on the
engine not starting (or at least kicking) when the prop is moved.

George Patterson
None of us is as dumb as all of us.

"Robert M. Gary" wrote in message
m...
"Dave Stadt" wrote in message
gy.com...
"Robert M. Gary" wrote in message
om...
"Dave Stadt" wrote in message
om...
"G. Burkhart" wrote in message
newspwwc.8392$HG.7233@attbi_s53...
"Jay Honeck" wrote in message
news:ZFtwc.45447$pt3.6238@attbi_s03...
The J-3 didn't. I believe one of the Chief's didn't. I think
mixture
was an optional item on all the 40's 65hp planes. Even when
you
had
mixture, it didn't do anything on the ground. It only effected
you
at
cruise power.

Thanks, all, for the info about mixture-less aircraft. I've
only
flown
a
Cub once, and (apparently) never noticed the lack of a mixture
control.
(I
don't think I ever touched the throttle -- the guy in back was
working
the
power...) And I sure had no idea that this feature (or lack
thereof)
was
universal to so many small-engined, older airplanes.

There's a few features that older aircraft don't have. Some with
the
Stromberg (?) carbs have them safety wired fully rich and use the
mag
switch
to shut down. It's kind of like shutting off a computer by just
pulling
the
power cord out of the wall.

Actually it is like shutting off your car. Not a big deal by any
means.

Just don't touch the prop aftewards (unless you want it to start).
When I had the Chief we had to shut it down with the mags. Usually a
20 degree turn on the prop was all we needed to hand start it. Now, if
some line guy were to "move" the prop, he'd have a hand full of his
hands (if the mags didn't ground). At least with a mixture airplane
you shouldn't have as much fireable fuel in the cylinders.

-Robert

I wouldn't bet a plug nickel on your last statement.


I wish you'd bet more because I want to get a new GPS for my plane. I
can only speak from years of owning a Chief with no mixture control.
Shutting down (with mag switch) putting gas in, turning the mags back
on, and turning the prop 1/8 turn (no starter), jumping in and flying
away.

-Robert

I guess my comment went way, way over your head. What I am saying is that
if you think an engine shut down with an idle cutoff mixture control won't
have enough fuel in a cylinder to take off an arm you are kidding yourself.