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From: Jerry Hey <jerryhey@earthlink.net>
Subject: Re: [FlyRotary] Re: Mount offset
Date: Thu, 12 Apr 2007 13:41:43 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

No doubt every plane is different.  The Tailwind which is extremely  
fast has zero offset on the engine but the leading edge of the Vert  
Stab is off set .5 inches.  I suspect the TW would be slower with the  
engine thrust off set.    My very limited experience is that if one  
can wait until enough speed  is built up for the rudder to become  
effective before pushing the throttle to the stop, then trips through  
the boon docks  are unlikely .  Jerry


On Apr 12, 2007, at 2:12 PM, Bobby J. Hughes wrote:

> Ed,
>
> Since the RV10 is matched drilled I am not sure how the vertical  
> fin is
> positioned. But I figure Van's took all of these items in to
> consideration during the design process. No point in reinventing the
> offsets. No jokes.... Is your ball out to the left or right?
>
> Bobby
>
> -----Original Message-----
> From: Rotary motors in aircraft  
> [mailto:flyrotary@lancaironline.net] On
> Behalf Of Ed Anderson
> Sent: Thursday, April 12, 2007 7:45 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Mount offset
>
> Hi Bobby,
>
> When I designed my original motor mount for a 2.17 gear ratio I offset
> it 5/8" to the left.  Now that I have a 2.85 (opposite prop  
> rotation), I
> still fly with it offset the same.  The only place where I notice this
> "incorrect"
> offset really gets my attention is on take off.  I could really use  
> the
> prop pointing slightly to the right instead of the left.  In cruise at
> 170 MPH TAS it is within 1/2 ball.  My vertical fin has not offset.
> Personally, if I were to do the motor mount again, I think I would  
> shoot
> for 0 deg offset.
> Just my 0.02 worth
>
> Ed
> ----- Original Message -----
> From: "Bobby J. Hughes" <bhughes@qnsi.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Thursday, April 12, 2007 9:27 AM
> Subject: [FlyRotary] Re: Mount offset
>
>
> I did say simple and no I am done with geometry :)
>
> -----Original Message-----
> From: Rotary motors in aircraft  
> [mailto:flyrotary@lancaironline.net] On
> Behalf Of Ernest Christley
> Sent: Wednesday, April 11, 2007 8:03 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Mount offset
>
> 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  |
>
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