|
|
|
|
Dave's RV-7A Builder's Log
|
Date: 3-3-2016
|
Number of Hours: 3.75
|
Manual Reference:
|
Brief Description: Ammeter shunt and current limiter installation
|
|
I took a couple of days off from work, so I went out to the hangar to get a few hours in on a pleasant Thursday morning. Last weekend I completed the inventory for the additional wires and terminals I would need for the main power supply, so I decided to start working on attaching the ammeter shunt and the current limiter—both of which I’ve decided to put on the engine side of the firewall. My goal in this is to keep most of the higher current terminals grouped together to minimize heavy wire runs through the firewall and into the cabin.
As I was putting the plan together, I noticed that my drawing had one extra—and unnecessary—6 AWG wire going through the firewall to connect to my main power bus. The Aeroelectric drawing showed a much more effective design that had the feed coming off of the ANL fuse going straight to the hot side of the start relay. This means only having to run 6 AWG through the firewall once…big advantage! With that, I set about fabricating a doubler to go on the lower firewall, just below and outboard of the two relays. This piece of real estate is unused at the moment, and the proximity to the relays gives me only about 6”-8” to run from the ANL terminal to the start relay.
Doubler fabrication, drilling to the firewall, nutplate attachment and riveting were all pretty standard. I will admit that I got in a bit of a hurry in the end and due to the reach from the top of the firewall down to each side of the doubler for riveting, there were a couple of rivets I wasn’t 100% happy with. Although I probably will drill those out and reset them, I decided to quit for the day by bolting the two assemblies in place to get an idea of what to do next.
|
|
Doubler fabrication
|
|
Drilling to firewall
|
|
Shunt & ANL fuse holder
|
|
|
|
|
|
|
|
|
Copyright © 2001-2024 Matronics. All Rights Reserved.
|
