Mailing List flyrotary@lancaironline.net Message #13475
From: Ernest Christley <echristley@nc.rr.com>
Subject: Re: [FlyRotary] Re: gear drive for distributor and oil metering pump
Date: Sun, 05 Dec 2004 17:38:24 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
David Carter wrote:
Wonder if "we" could come up with an alternator to drop into that hole -
some back-up "juice" for our "electrically dependent engines".

David


That is exactly what I've been thinking, David.  Steve stopped by to look at my project last week, and we were discussing it. Thanks to Mr. Leonard over there, I now know what to look for.

I need to find a 2/3HP or 500W or 30Amp generator/DC PM motor.  It'll be 3" or 4" in diameter, with a couple inches of shaft sticking out.  I'm thinking it would be easy enough to key the shaft to fit as a direct replacement for the metering pump.

I don't have the numbers with me, but I was doodling with them a while back.  I figured something like a couple of in.lb. of torque on the worm gear to produce 500W at 6000RPM.  I now know the gear would turn at half that, so it is still less that 5in.lb. on the gear.  The upshot is that 3000RPM motors are much more abundant that 6000RPM motors.

I'm trying to source a part.  I'm also thinking that a standard alternator can be made to fit by cutting down the housing.

--
http://www.ernest.isa-geek.org/
"This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."

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