I'm sorry but I have too many irons in the fire
for much of a detailed response.
Craig said,
There is a variable orifice as well as the bypass valve involved in
the fuel return system that will affect fuel rate beyond the return line
size
Craig,
can you say a little
more about these features?
What is a
variable orifice? Off deck pressure via the aneroid. (piston
and orifice)
Where is it in
relation to the boost pump, eng pump, metering unit? All of these features are
built into the engine driven fuel pump. The engine fuel pump controls the
pressure going to the metering unit. The boost pump is upstream to
the engine pump and the metering unit is downstream of the engine
pump.
Where is the
bypass and what does it take to open it? The bypass is in the engine pump. I'm not sure how
this all interacts. There is also a recirculation path going back to the vapor
separator. The recirculation path is blocked at full rich and fuel flow should
be blocked at idle cut off. Not one thing controls the bypass
fuel.
This may be more confusing than
helpful. Hopefully someone will correct me if I have made a mistake in my
haste.
Craig
Panel done is 2
weeks
1st flight is getting
close
thanks,
Colyn
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