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Buck's RV-8
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Date: 6-27-2010
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Number of Hours: 2.00
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Manual Reference:
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Brief Description: Forward bay "black box" rack
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Since I recently took delivery of my EFIS backup battery, which is the heaviest and largest of the boxes that will go in the electrical "hell-hole" under the forward baggage compartment, I decided to begin designing the mounting system that will secure all the various units in place. I wanted to make sure each of the various units could be accessed and removed easily, and utilize as much of the surrounding aircraft structure as possible. It's not easy to do this in the limited space available, and there are some interesting roadblocks in the RV-8 fuselage. The biggest one is that the lower right-side longeron is actually tilted about 20 degrees, which makes it very difficult to tie into. I decided the job could be accomplished using just the forward and aft floor angles.
I laid out some 0.060" angle and began playing around with various configurations that might work, eventually coming up with a twin-rail mounting scheme that will allow for flexible mounting of any size of box, in nearly any orientation. It will also allow me to create a second, removable layer if I need it. (And I think I might...)
It's a challenge to add a structure like this to a finished RV-8, because there's no access under the floor. I'll have to use rivnuts to attach the support angles to the floor, with spacers used to support the angles mid-span (between the support angles and the floor). That's the plan right now, anyway. It's all subject to change as I develop it.
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The two smaller boxes will be mounted to base-plates that are screwed into the rails.
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The bottom angles will be attached to the floor with rivnuts. Bolts will attach the side rails.
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