I too like the idea of no pulleys on the engine.  If this works out, I would be inclined to put the alternator(s) on the PSRU end, and do a direct drive water pump off the e-shaft end.  IMHO, I would think just running an EWP would be a risk.

Grant Schemmel

-----Original Message-----
From: Ernest Christley [mailto:echristl@cisco.com]
Sent: Thursday, February 24, 2005 10:11 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: E-shaft permanent magnet alternator


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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