Today's Message Index:
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1. 05:04 AM - Re: Low Fuel Flow Indication (Thom Riddle)
2. 03:33 PM - Low fuel flow readings - Update (John Fasching)
Message 1
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| Subject: | Re: Low Fuel Flow Indication |
John,
What altitude do you normally cruise at? If this flight was at a higher density
altitude(DA) than previous flights you should expect a decrease in fuel consumption.
At higher DA, if you fly at same a rpm as at lower DA, your engine is
producing less power. It takes more RPM on fixed pitch prop to produce the same
power as at lower DA.
If this flight is at about the same DA as previous flights, perhaps the engine
is loosening up a bit. New engines are frequently tight which results in more
friction drag and more fuel consumption for a given rpm at same conditions.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
Truth is what stands the test of experience.
- Albert Einstein
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=360508#360508
Message 2
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| Subject: | Low fuel flow readings - Update |
RV-12 50+ hours, Dynon D-180, completely normal except for "between
flights" change in indicated GPH.
I pulled and flushed out the FT-60 "red cube" fuel flow device and it
seems clean, no dirt or debris. Still reading low, so I reset the K
factor for the Dynon D-180 to increase the GPH and will have to
trial-and-error set it in flight to get the former 4.0 GPG that I had
been seeing. The original K factor setting had not changed, so I am
uncertain what changed. (Always had shown 4.0-4.1 GPH and between
flights it changed to around 3.3-GPH for the same engine operation.)
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