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Andrews Web Site
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Date: 7-19-2022
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Number of Hours: 6.00
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Manual Reference:
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Brief Description: Fuel probe accomodations
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In the prototype design, Dick uses two capacitance probes per wing, one at the root and one at the tip. I'm going to be using a Dynon Skyview system and I asked the folks at Dynon to verify that you can do a summation of the two probes with their hardware. The answer is, that you can, but in thinking about the installation, and the cost of each probe, I wondered if it might be possible to simply use one long probe inserted from the wing tip location. This would simplify the installation, give me access to the probe from only one location if I need to service it, and reduce the overall cost of the probes. I looked at the amount of immeasurable fuel using this scheme, and it appears that I may not be able to measure the first and last gallon used. However, since I will also be using a fuel flow meter (red cube) I should have a good handle on the overall fuel quantity despite the direct measurement issues. I am opting for the single probe system. To make this work, I will have to insert the probe through multiple ribs after the wing has been closed and sealed. Therefore, the alignment of the rib holes must be good. Image 1 show using a series of lasers with offsets to establish the correct lines. Image 2 and three show a welding rod inserted in the holes to help visualize the path of the probe and location in the bottom of the tank. Note that the probe terminates in the second rib in the outboard rib section (the one with the flop door) Therefore, although the probe will be very close to the bottom of the tank, it will not be at the most inboard location. As a result, there will be some unread fuel (tank reads zero when there is actually a splash or two left)
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Aligning the hole location for fuel probe
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Visualizing the probe location with welding rod
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Visualizing the probe location with welding rod
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