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Buck's RV-8
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Date: 12-6-2007
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Number of Hours: 0.00
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Manual Reference:
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Brief Description: Electrical system planning
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(7.5 hours) I worked most of the day on electrical system concepts and diagrams. After a long series of emails and forum postings with various people including Bob Nuckolls, who recently pulled the Z-13/20 diagram from his AeroElectric Connection (AEC) book because it "sucks" (his word!), I have decided to go with his Z-12 diagram, modified for my own priorities and goals. The Z-12 is a dual-alternator, single battery system, with a 20-amp aux alternator.
My alterations to the Z-12 system are as follows:
1. I will have a solenoid-activated alternate E-bus feed path from the battery bus to the E-bus.
2. My E-bus is an "Essential Bus," not an Endurance Bus. If I lose my main alternator, my E-bus will allow me to comfortably and safely divert, under IFR, to the nearest suitable airport where repairs can be made, without using the main battery. (I do NOT want to necessarily continue my flight to my original intended destination, as the AEC book proposes. I heartily disagree with that concept, as I think it's poor airmanship to overfly a suitable airport with a known malfunction in an airplane.) The Essential bus will feed my two main EFIS displays, AHRS, EIS, Garmin 430 Com/GPS, autopilot, and transponder. Once in the vicinity of the divert airport, I can turn the battery back on and lower the flaps, use the landing light if needed, etc. My backup EFIS has an internal battery.
3. I will have a backup starter button powered from the E-bus. This will allow me to start the engine in the event of a switch failure in the stick, and also allow me to re-start the engine in a time-critical inflight situation, without having to throw the guarded "Start Arm" switch first. (As a side feature, it will also allow me to start the engine in the event of a battery contactor failure, simply by closing the "E-bus Alternate Feed" switch. I don't anticipate using this feature because as I alluded to before, I do not fly airplanes with known significant malfunctions. It might be used to taxi the airplane to the shop, however.)
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My electrical system, Version 1.01
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