Received-SPF: none
 receiver=logan.com; client-ip=24.25.9.102; envelope-from=echristley@nc.rr.com
Message-ID: <41B38DE0.50609@nc.rr.com>
Date: Sun, 05 Dec 2004 17:38:24 -0500
From: Ernest Christley <echristley@nc.rr.com>
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040113
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: gear drive for distributor and oil metering pump
References: <list-556817@logan.com>
In-Reply-To: <list-556817@logan.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

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)."