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Cowboy's RV-10
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Date:  5-2-2012
Number of Hours:  4.00
Manual Reference:  18.5
Brief Description:  Refine Fuel Tank Sensor Location

18-5:
Was not sure how accurate my first model was as an estimator so have re-anayzed using a better linearization of the rib and a reconstruction of the finite element model. The linearization now represents reality more closely and the calculations can be made by applying basic geometry and a summation of each 1/4 in layer beginning at the bottom of the tank and incrementally summing to achieve a suitable answer. Microsoft Excel was used to do the math once the formulas were developed. I did not include the lower three element levels as I estimate that is when the fuel intake will suck air.

Results:

Index...C1.... C2.....Vol index............Vol total.............Vol useable..... Flt Time
............................... (cu in)............(cu in).. (gal)..............(gal)..............(min)
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.1........9.0....17.0........2.60............2.60....0.01...............0.00..............0.0
.2......26.0....10.0......12.09..........14.69....0.06...............0.00..............0.0
.3......36.0......8.0......25.72..........40.41....0.17...............0.00..............0.0
.4......44.0......5.0......41.68..........82.09....0.36...............0.11..............0.5
.5......49.0......4.0......58.71........140.80....0.61...............0.36..............1.8
.6......53.0......4.0......77.36........218.17....0.94...............0.69..............3.5
.7......57.0......2.0......96.35........314.52....1.36...............1.11..............5.6
.8......59.0......2.0....115.00........429.52....1.86...............1.61..............8.0
.9......61.0......1.5....134.12........563.64....2.44...............2.19............11.0
10.....62.5......1.0....152.92........716.56....3.10...............2.85............14.3
11.....63.5......0.5....171.01........887.58....3.84...............3.59............18.0
12.....64.0......0.5....188.77......1076.34....4.66...............4.41............22.0
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Tank Rib Cross Section Linearization

Tank Rib Cross Section Linearization

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Finite Element Volume Model

Finite Element Volume Model

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The Formulation

The Formulation

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