Received-SPF: none
 receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@att.net
Message-ID: <4F2C41B8.4070106@att.net>
Date: Fri, 03 Feb 2012 15:21:12 -0500
From: Ernest Christley <echristley@att.net>
Reply-To: echristley@att.net
User-Agent: Thunderbird 2.0.0.24 (X11/20100623)
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: New Flywheel for RD-1x redrives
References: <list-5381963@logan.com>
In-Reply-To: <list-5381963@logan.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

Gordon Alling wrote:
> Tell us more about this in-line generator.  This is the first I've heard of
> it and it sounds interesting.  Is it a commercial product?  From whom?
> 

There's quite a bit of discussion of it in the archives.  The generator comes from a Harley-Davidson motorcycle, and
there are several companies making aftermarket pieces.  Compufire seems to be a leader:

http://compufire.com/index.php?option=com_content&view=article&id=7&Itemid=15

The general idea is to bolt the rotor to the front of the flywheel, and the stator to the back of the gearbox.  One
builder has already modified a previous iteration of the RWS PSRU, but it required more machine work than I think most
builder want to contemplate in order to free up enough room for the parts.  I'm using a one off PSRU which allowed me
lots of room to install one.  If Tracy's new design frees up some room between the gearbox and flywheel, this could be
an easy installation to eliminate mounting hardware, a belt, and pulleys, and free up the under-cowl space for something
else.


> Gordon C. Alling, Jr., PE
> President
> acumen Engineering/Analysis, Inc.
> 
> 540-786-2200
> www.acumen-ea.com
> 
> 
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of Ernest Christley
> Sent: Friday, February 03, 2012 2:33 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: New Flywheel for RD-1x redrives
> 
> Tracy wrote:
>> Don't know the dimensions of the generator in question but one of the
>> design goals was to change as little as possible, so the distance
>> between engine and gearbox was unchanged.
>>
> Off the top of my head, the rotor is 1.25" deep, and would need a 6" dia
> flat on the engine side of the gap, centered on the shaft.  The stator
> fits completely inside the rotor, so it only needs 1/8" to allow for
> routing the wires out.  If the space has been expanded even a small
> amount, it should allow for a relatively easy addition of a compact 38A
> generator, eliminating belts and pulleys.  I only have a microscopic
> amount of time on mine, but it has been working so far.
> 
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
> 
> 
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html
>