Today's Message Index:
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1. 03:10 PM - Fuel Question (Dave Saylor)
2. 08:43 PM - Re: Fuel Question (woxofswa)
3. 08:45 PM - Re: Fuel Question (Bob Turner)
Message 1
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A little background: we just finished the Hayward Air Rally (
www.hwdairrally.org) for about the 10th time. We placed 8th out of 22,
which is about where we usually place.
The rally judges us on fuel and time estimates during routes from the
Hayward, CA to Redding, then to Bend, OR. We were 1.2 gallons off of our
fuel estimate and 37 seconds off our time estimate. The winner was 6
seconds and 0.3 gallons off his estimate, in a 172.
This year we tried the "Glass Class", which allows us to us to use all
available technology, instead of just a compass, map, and stopwatch. The
penalties are tripled and our score ended up similar to our past entries.
The winner was in traditional class.
Every year the fuel penalty is our nemesis. We know why our time was off,
and next year we'll adjust for that. But we can't nail the fuel for any
amount of trying, even using the totalizer.
There seem to be two issues. First, the totalizer doesn't seem to be as
accurate at low ie, idle, power settings. It generally reads 2-3 gph,
which we think is high.
Second is refilling the tanks to the same level each time. We can't top
the tanks or it will vent enough overboard to ruin our score. We use tabs
that I installed to fill the tanks to about 28.5 gallons. Even refilling
to the same spot on the tab doesn't really return the results we want. We
need a system that will show when a tank is refilled to just the same level
each time.
Any suggestions? The rules allow us to level the plane, which we started
doing this year, and we can use a stick so long as it only has a single
calibration mark. We haven't used a stick yet. I'm also interested in
what others have noticed as far as extreme accuracy of their totalizer.
Plenty of folks report sub-gallon accuracy. Anyone doing much better than
that? How?
Last thing, the rally will be going from Hayward, California to Oshkosh for
AirVenture next year. It's a lot of fun, even if somewhat frustrating, and
of course a great challenge. If anyone is interested, please look into it.
More RVs would be great!
Dave Saylor
831-750-0284 CL
Message 2
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| Subject: | Re: Fuel Question |
It is surprising how much temperature plays a role in the volumetric measurement
of fuel.
For extreme accuracy, you would need a temperature adjustment formula or graph
to fine tune a dipstick measurement. Airliners use dripsticks underneath the
wings but the reference tables are graphed by different temperature ranges.
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Myron Nelson
Mesa, AZ
Emp completed, QB wings completed, legacy build fuse on gear. Finishing kit and
FWF kit in progress.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=403670#403670
Message 3
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| Subject: | Re: Fuel Question |
37 seconds? That could just be the tower sequencing you #2 instead of #1. How can
you plan for that?
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Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=403671#403671
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