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Rob's REBVAIR Project
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Date:  11-2-2014
Number of Hours:  2.00
Manual Reference:  
Brief Description:  Battery Bracket

Saw this bracket online (image 1) while searching for battery cases for the Odyssey PC680 unit I plan on using. Don't want to buy the battery just yet, but need to plan for its location. Most pre-fab brackets out there cost between $50 and $75, and this one was $68. When I saw it though, it looked simpler than most of the others, and didn't require a bunch of countersunk rivets. Since I have a decent bending brake and lots of 0.050" and 0.063" aluminum stock, it seemed like a good use of time and materials.

Sure enough, after about 2 hours in the shop, I had a reasonable facsimile of the original (image 2)....and on the first try too. It's exceedingly light as well. In terms of strength, the battery weighs 15 pounds, so the bracket needs to be able to withstand at least a 90-lb load (using the published structural limit of the aircraft at 6Gs).

Image 3 shows it installed on the firewall with 4 AN3-4 bolts with nutplates on the other side. Removing the battery will be somewhat routine, and I wanted to be able to do so without needing someone to hold a wrench on the cabin-side of the firewall. The block of wood is a mock-up of thebattery that I fabricated to help me see where the outside limits of the battery would lie.
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original NCI bracket

original NCI bracket

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2 hours and a few dollars worth of 0.050

2 hours and a few dollars worth of 0.050" Al

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