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Date: Tue, 05 Sep 2006 13:24:03 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Engine alignment
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Dale Rogers wrote:

> Hi All,
>
>    Okay, I admit I'm taking the easy way out.  I haven't done an
> exhaustive search of the archives.  Is there an easy way to
> ascertain the eccentric shaft centerline, for purposes of designing
> an engine mount?  I've decided I want to try a plugs-up mount for
> my test stand.  Some things might be easier to fit in, using that
> orientation.
>
>    So far, only two strategies have come to mind: take the eccentric
> shaft out, and replace it with two apertures; or machine a pointed
> mandrel which can be bolted to the pulley flange.


A dowel hammered into a piece of scrap plywood that was drilled 
accurately could be bolted to the pulley to make a nice pointer.  I used 
a laster level that has the filter to make a straight line.  Mounted it 
on a camera tripod off to the front corner and fiddled with it till it 
cut a watermark through the aircrafts lateral and longitudinal 
horizontal centerlines.  You have to work in the semi-dark, but 
measuring the upthrust was done with a ruler at the prop flange.  I put 
the laser in front of the airplane and got a vertical line cutting 
through the center of the airplane, and again the side offset was 
measured with a ruler at the prop flange.

-- 
         ,|"|"|,              Ernest Christley       |
----===<{{(oQo)}}>===----    Dyke Delta Builder      |
        o|  d  |o        http://ernest.isa-geek.org  |