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Albert Gardner
Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
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 Posted: Wed Sep 26, 2007 9:17 pm Post subject: Dynon Fuel Tank Calibration |
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On the subject of Aircraft Mutual Benefit Co., originally I thought only Bob
and Rick were wrong but now I see that many more could possibly being
joining that group. I mean, since I'm - by definition 'right' - anyone who
disagrees with me must be 'wrong'. 
On another subject:
I was doing the calibration of my fuel tanks for the Dynon 180 and found an
interesting situation. The float isn't right at the root of the tank and
hits the top before the tank is full so it can't register levels across the
entire 30 gal. capacity of the tanks. It looks like the float hits the top
at about the 22 gal. mark so the Dynon says a full tank is 22 gal. and will
hold that reading until the float begins to drop. I guess that will have to
be OK and the backup is to enter the proper fuel amount into the fuel
computer and use its calculations of fuel used and remaining. Oh well, the
gages only have to be accurate at empty to be legal. A call to Dynon
confirms the situation and provided some additional information but it
appears that this is the way things work.
This isn't a new situation since the cap. gages I had on the RV-9A couldn't
read empty and full tanks either but the software in the EI fuel gage
handled it differently than the Dynon does.
Albert Gardner
Yuma, AZ
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_________________
RV-9A N872RV
RV-10 N991RV |
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Tim Olson
Joined: 25 Jan 2007
Posts: 2882
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| Posted: Wed Sep 26, 2007 9:33 pm Post subject: Dynon Fuel Tank Calibration |
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Yup, been that way on all the RV-10's so far. I think it's about
24 gallons though where the floats start to drop. No big deal,
because the totalizer is way better at telling you how much is
left.
Tim Olson - RV-10 N104CD - Flying
do not archive
Albert Gardner wrote:
| Quote: |
On the subject of Aircraft Mutual Benefit Co., originally I thought only Bob
and Rick were wrong but now I see that many more could possibly being
joining that group. I mean, since I'm - by definition 'right' - anyone who
disagrees with me must be 'wrong'.
On another subject:
I was doing the calibration of my fuel tanks for the Dynon 180 and found an
interesting situation. The float isn't right at the root of the tank and
hits the top before the tank is full so it can't register levels across the
entire 30 gal. capacity of the tanks. It looks like the float hits the top
at about the 22 gal. mark so the Dynon says a full tank is 22 gal. and will
hold that reading until the float begins to drop. I guess that will have to
be OK and the backup is to enter the proper fuel amount into the fuel
computer and use its calculations of fuel used and remaining. Oh well, the
gages only have to be accurate at empty to be legal. A call to Dynon
confirms the situation and provided some additional information but it
appears that this is the way things work.
This isn't a new situation since the cap. gages I had on the RV-9A couldn't
read empty and full tanks either but the software in the EI fuel gage
handled it differently than the Dynon does.
Albert Gardner
Yuma, AZ
rums.matronics.com
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jesse(at)saintaviation.co
Guest
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| Posted: Thu Sep 27, 2007 2:41 am Post subject: Dynon Fuel Tank Calibration |
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In my experience, the Dynon reads between 24 and 26 gallons as full, so it
will just show "26+" when the tank is full. Because of the dihedral in the
wing, there is no way for a float to be able to read full and empty
accurately, and you are right, when it is full you don't need an extremely
accurate reading as much as you do when it is almost empty. If you
calibrate it correctly, it will be very accurate as you burn past the max
level on the float, especially in smooth and coordinated flight. On our
C172 the gauges are about as valuable as a hole in the head. They give you
an idea of where the tank might be, but nothing as accurate as you can get
these days with the modern electronics. Comparing the float to the
totalizer is a great way to manage fuel. The totalizer can be wrong by a
little bit, especially when it is "freaked out" by flying with the boost
pump on, so getting used to monitoring both the totalizer and the floats is
wise.
Can you tell the rest of us what it is like always being right?
Do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
www.saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694
--
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wayne.e(at)grandecom.net
Guest
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| Posted: Thu Sep 27, 2007 3:48 am Post subject: Dynon Fuel Tank Calibration |
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Albert,
I have the same problem with my fuel gauge and when I talked to EI about it, they told me that this is a quite common situation. I guess it really doesn't matter, since I want to know when I'm getting close to empty, but the indicator goes from full to 1/2 full quickly :>} I usually never rely on the fuel gauge anyway I usually go by how long I've flown. But if you were to get a leak you need to know the empty spot.
On the insurance issue I think that this could possible be of benefit to all RV10 flyers if it can work, so I have to respectfully disagree with you that this isn't the correct forum for it.
Wayne Edgerton N602WT
Hopefully I will get me plane back from paint tomorrow
[quote][b]
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