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Rob's REBVAIR Project
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Date: 11-1-2017
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Number of Hours: 6.00
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Manual Reference:
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Brief Description: BRS part 3: egress opening
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The structural reinforcements in the roof here are worth noting. I wanted the parachute to be just behind the front seats for W&B reasons. I also wanted a 4-point safety harness system (an upgrade from the MAM 3-point standard seat-belt system). To have these two features occupy the same space, I needed to install a highly reinforced channel in the center of the roof to hold the 4rth-seat-belt attach fitting for both pilot and co-pilot. This channel limits the inboard positioning of the egress window. Any builder not wanting the 4-point safety-harness would not need this reinforced area.
According to the MAM plans, this 'bay' can accomodate an 8" x 10" window. However, since the egress window needed to be much larger than that, I installed a 0.050" doubler that goes just under the roof skin from the left outboard edge, all the way to the center channel, and captures both bulkheads defining that bay. The aforementioned doubler and window flange (below) are held in place with the same line of rivets to save weight. If Murphy engineers later say the 0.050" doubler is not needed, one could glue the 0.032" flange to the window opening as prescribed by BRS for the Vans aircraft installations.
Image 1 shows the 0.032" flange on the inside of the opening. The exposed flange (once installed) is about 0.5" wide all the way around the opening (Image 2). The ABS egress cover is 0.063" thick, and the 0.025" roof skin and 0.050" doubler total 0.075" in thickness, allowing the ABS cover to sit nearly flush with the roof line (including a few thousandthsof an inch for the adhesive).
Image 3 has the 0.063" ABS window dropped into the opening, and the harness fairing in place to help gauge the cut-out location for the bridles.
Cover will get painted same grey as the fairing (or whatever color the roof receives in this space)
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flange goes on the inside
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flange in the opening
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