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Rob's REBVAIR Project
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Date:  5-28-2014
Number of Hours:  4.00
Manual Reference:  
Brief Description:  Coil/gascolator cooling box Part 4

Final air box with triangular top. This houses the 1.25" hose flange, and the integrated diode 'switching' device that allows either of the coils to provide voltage to the distributor. Having two coils provides redundancy, and there's a switch in the cockpit that will control which circuit to use. If a coil were to fail in flight, you simply flip the switch and use the other coil. At run-up (and as part of standard flight ops) there should be routine swtiching between circuits to ensure both are working correctly (and truly redundant).

If I've read WW's site correctly, power to these coils is provided directly through the battery positive terminal (controled, I assume by an inition ON/OFF switch). This is done to mimic the traditional 'master' switch in certificated aircraft, where an alternator or other electrical failure would not prevent the engine from running. In other words, with adequate fuel and voltage, the engine would continue to run - even on battery alone - for about 30 min (assuming your battery is in good health).
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