Received-SPF: softfail
 receiver=logan.com; client-ip=64.102.122.148; envelope-from=echristley@nc.rr.com
Message-ID: <461D934F.5010801@nc.rr.com>
Date: Wed, 11 Apr 2007 22:02:55 -0400
From: Ernest Christley <echristley@nc.rr.com>
Reply-To: echristley@nc.rr.com
User-Agent: Mozilla Thunderbird 1.0.7-1.4.1 (X11/20050929)
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Mount offset
References: <list-1980312@logan.com>
In-Reply-To: <list-1980312@logan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Lehanover@aol.com wrote:

>  
> With no experience at all in this area, I had imagined that the engine 
> would be turned about a vertical line through the prop flange. This, 
> to induce the required side thrust while keeping the spinner back 
> plate centered over the hole in the cowling.
>  
> Lynn E. Hanover 
>
This will have very little to do with RVs, but John Dyke specifies 2/3rd 
of one degree right thrust on the Dyke Delta.  That is hinged at the 
prop flange.  He also specifies 1.5 degree upthrust, but that is hinged 
at the firewall.

Bobby, a better way to measure the offset is to break out the old 
geometry book and calculate the offset.  The sin(1.25)x47" is 1.02".  
The end of the engine will move off center by a long inch.  You won't be 
able to read 1/4 degree on most protractors, but an inch is easy to make 
out.

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