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Jim Sower wrote:
I don't see the point of two primaries (unless you're using 1920s era technology like mags). My notion is to have a good, solid ND primary and either a [small] backup battery or [small] backup Alt. If I have redundant primaries, I'm probably too heavy, and (just me) more tempted to drive around with one failed while I wait on parts or something.
Jim, my goal is to eliminate the belt driven alternator entirely. No belt. No pulley. No heavy alternator hanging off the side of the engine on a heavy cantilevered bracket. No need for a cowl bump to give it clearance.
I'm looking for at least a 35A primary and 20A secondary. I'm actually quite comfortable with the idea of flying with only a primary, but if you look at these things they are like an alternator with all of the heavy parts thrown out. The backup is cheap, weight wise. My guess is that the difference between the 20A and 35A unit is the wire guage used in the coils, and you'd need an ounce scale to tell the difference.
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