The Murphy Builders Site

FYI - Yesterday I put the tailwheel into a hole in the ground to get a 15
deg. nose high attitude. Because slow flight (near power on stall) will
probably be higher than that, I would have liked to get it a little
higher,
but that wasn't easily doable without digging a much larger crater or
taking
the tail feathers off, so I decided to make do with a 15 deg. test.

With just a little more than 3 gal. total in the tanks (to minimize head
pressure) I measured a gravity flow rate of greater than 20 GPH at the
carb
inlet. That's more than double the Jabiru 3300's maximum possible WOT fuel
usage of approx. 9 GPH, so I think it's reasonable to conclude the engine
will have plenty of fuel even with the nose up a little higher.

For reference, the fuel lines go behind the torque tube and down to a "T"
(and drain) under the baggage area, then forward in a single line to the
FW
and through the gascolator, fuel pressure and fuel flow sensors, before
reaching the carb. Photos at http://n254mr.com

Ron
254R




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The requirement Ron is 150% of the Wide Open Throttle fuel requirements...
125% if you have a pump.

Also note when doing the fuel flow test.. the inlet screen for the carb is
supposed to be on the end of the line. Rarely is.. but that is the way it
supposed to be done.

For those that come after you.. ie haven't got to this stage yet... A set
of
car ramps works great for getting the extra angle for the test.

Wayne