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Date: Sat, 20 Jul 2013 12:41:00 -0400
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Subject: Re: [LML] Re: Fuel vol correction
From: Charles Brown <browncc1@verizon.net>
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OK, thanks Bill B, John B, and Bob P for inputs.  Bill's info below is =
interesting in that it confirms that 37 may be a good number if things =
are working right.  I did not sump the tank prior to filling, because I =
assumed I'd put in 37 gallons -- but I may try that next time.  However, =
it won't prove much, will it?  There *should* be *some* fuel left at the =
sumps, regardless; that's where the unusable fuel hangs out, right?

I am the builder, I have photos proving (as I checked at the time) all =
the little half-circle cutouts in the spar were present and not blocked =
by ProSeal; the geometry of the rib caps makes it extremely unlikely =
that Hysol could have blocked the cutouts at wing closing and at any =
rate, I measured the 37gal volume long after the wings were closed.  I =
can still hear the gate valves slapping whenever I rock the airplane on =
the ground with partial fuel, so they're working; and there's no venting =
issue.  I slipped the plane in flight to get the last of the fuel, but =
maybe not long enough?  Once the engine sputters, it could take many =
seconds to re-establish flow?  Hmmmm.....

Of course it's possible that some blockage has occurred, I can check =
that out with a borescope, sounds like fun.  Thanks guys, I'll let you =
know if I figure it out.  Good ideas in Bob's article.

CB


On Jul 19, 2013, at 2:51 PM, Bill Bradburry wrote:

Charley,
Did you sump the tank prior to refilling it to ensure that it was truly
empty?  You may be looking at 3 gallons un-usable.  The Legacy wings =
have
little dihedral and there is a lot of sloshing.  You may have unported =
the
fuel outlet finger strainer and made you think the tank was empty.

When I calibrated the fuel gage on my Legacy with speed brake wells, =
both
tanks were 36 gallons filled to the bottom of the fuel inlet.  37 =
gallons
makes sense if you don't have the speed brake wells.

B2

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Charles Brown
Sent: Friday, July 19, 2013 7:22 AM
To: lml@lancaironline.net
Subject: [LML] Fuel vol correction

I may have provided some bad info in the past.  I stated that the fuel =
vol
in my wing tanks was 37 gal per side; attributing the extra to the =
complete
absence of speed brake provisions.  However, I just got around to =
exhausting
a fuel tank in flight, and refilled it with 34 gallons.  Of the many
possible variables, the one that seems most dubious is the accuracy of =
the
1/2 gallon measuring cup that was the basis for the original =
calibration.
I"m still sorting through this one.

Charley Brown
Legacy 275 hr
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