(18-4 step 8): Angela deburred all the stiffener holes and then dimpled them.
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| (18-5 step 4): After
that she deburred and dimpled the shims. Once again the large
screw holes showed signs of cracking, so we filed those out. |
I
spent a little time figuring out the exact location of the fuel return
fittings on the outboard rib. There are many thoughts on whether
these should be placed high or low, and we decided to go high... the
idea being that the pressure is lower resulting in less back pressure
in our return line (again, assuming we use it). The counter
argument is that as fuel is consumed and the level in the tank drops,
the fuel coming out of the fitting has farther to fall creating bubbles
and 'froth', which you don't want to introduce in your fuel supply
line. Since we're putting this in the outboard bay of the tank,
all the bubbles have time to dissipate before they get anywhere near
the fuel pickup located in the most inboard bay. Now, having said
that, here's the location we chose... Pretty much the highest point in
the tank... the upper rear of the outboard rib (the left tank is in the
cradle nose down in the pic)
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Here's
a shot from the inside. The only thing we had to worry about with
the location we chose was the fuel cap. We don't really want the
fuel returning to the tank constantly pouring into the side of the cap
so we tried to squeeze it between the cap and the baffle. Once
located, the hole was drilled for the fitting. Next the
anti-rotation bracket was located on the exterior of the rib, and the
two rivet holes match drilled into the rib.
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