Alex Ress Posted May 3, 2023 Report Share Posted May 3, 2023 Attached is a chart if you dip your tanks. I use a plastic rod off of some old window blinds to use a dipstick. Cut notches at 1" intervals. Finally got around to making a graph to show the fuel load. I love the Dynon fuel gauge but I trust my plastic dipstick. Phoenix Fuel Load.pdf Quote Link to comment Share on other sites More sharing options...
Doug Levy Posted May 3, 2023 Report Share Posted May 3, 2023 I don't have a Dyon system in U15/ 02. The VDO gauge is not reliable. So I made my own measurement device. The arm holds a paper that can be marked as needed. Just tap it on the tank when removing and the gas drops back in the tank. Quote Link to comment Share on other sites More sharing options...
Barry.h Posted May 18, 2023 Report Share Posted May 18, 2023 Mine is a lot simpler but very effective. It came with the aircraft so I can only assume it was made by the first owner. I have not checked its 'calibration'. What I can't explain is why it is so different for each side? Does everyone get mor e fuel in the Port wing and a different scale for each wing? Quote Link to comment Share on other sites More sharing options...
Barry.h Posted May 18, 2023 Report Share Posted May 18, 2023 Excuse the dumb question perhaps - but is that graph US gallons or Imperial? Quote Link to comment Share on other sites More sharing options...
Rob Posted May 19, 2023 Report Share Posted May 19, 2023 looks like liters (2*55 ltr is 110 ltrs) Quote Link to comment Share on other sites More sharing options...
Barry.h Posted May 20, 2023 Report Share Posted May 20, 2023 I was trying to compare my wooden stick to the graph at the top of the thread, which is in gallons. It looks like it is aligned to my Starboard scale, but I am now very confused about the scale on my port side? Quote Link to comment Share on other sites More sharing options...
Alex Ress Posted May 24, 2023 Author Report Share Posted May 24, 2023 The graph I originally posted more closely aligns with Barry.h's wooden stick with the "S" at the top. Quite the riddle that there are two different scales on the wooden stick though. Is it possible the original owner of the stick had two different airplanes? I feel it's unlikely that the L/R wing tank volumes would vary enough to discriminate on a stick! It's a fun exercise to verify for yourself by draining and refilling gallon by gallon. I dip the tanks before every flight so that there is 100% certainty of what I started with. Quote Link to comment Share on other sites More sharing options...
Barry.h Posted May 24, 2023 Report Share Posted May 24, 2023 I always assumed the stick was only for my plane, and the P and S are Port and Starbord. I must admit I have overfilled the Port (left) tank a few times based on the dipstick so I think I will have to do a calibration check. Quote Link to comment Share on other sites More sharing options...
Doug Levy Posted May 25, 2023 Report Share Posted May 25, 2023 What is your burn rate? I'm seeing about 3 gallons / hour at 5,000 rpm. Quote Link to comment Share on other sites More sharing options...
Barry.h Posted May 26, 2023 Report Share Posted May 26, 2023 I have a Dynon fuel flow, which I have not yet properly checked it's calibration, but it looks pretty close. It has been reading around 16-17 liters per hour (4.36 US gallons) but the average after my recent big trip was about 14l/hr. Using the Dynon flow data, at a DA of 4,500ft, I recently recorded the following burn at different speeds. It has been suggested my prop might be over-pitched slightly and my RPM could be a bit higher. And sorry, I didn't record RPM in my burn test. Quote Link to comment Share on other sites More sharing options...
Tom Clary Posted June 29, 2023 Report Share Posted June 29, 2023 Ok, this might take some explaining. My plane #54 was delivered with float (resistance) sensors not the capacitance sensors that was on my equipment list. Fast forward with much drama and Jim helping me to change out the resistance sensor for the nominal capacitance ones. As a result, I wanted to be very careful about the fuel calibratiion that Dynon offers. With the great assistance of Scott Zumwalt we very carefully calibrated the fuel sensors. Our process was to put 1 gallon of fuel into the tanks and then have the Dynon record that value with the tail in its flying position (ie: up about 21 inches) . Every 5 gallons we lowered the tail and made a dip stick recording. The attached picture shows our results. Note that my tanks have very different capacity vs levels. Quote Link to comment Share on other sites More sharing options...
Alex Ress Posted July 6, 2023 Author Report Share Posted July 6, 2023 Tom, Thanks for sharing the work on your tank sensors and dip sticks. Love the laser engraving and the oak, nice touch. I have more work to do now, seeing multiple ships have variations in left vs right fuel height levels. Taking this further, it seems the tanks will have different capacities though only by what appears to be two gallons. I am not fluent in fuel sensors but after searching "resistance vs capacitance fuel sensors" I am a tiny bit smarter. Thanks for the post. Quote Link to comment Share on other sites More sharing options...
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