From: Charlie England <ceengland@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, May 2, 2011 3:12:58 PM
Subject: [FlyRotary] Re: hung. (the Renesis, that is ...)
On 5/2/2011 1:50 PM, Ernest Christley wrote:
> Charlie England wrote:
>> Correct. If I use Tracy's tuning, I can do straight runners. I can't see needing longer than 16", & that can be done with U shaped tubes with the plenum sitting
next to the block, in front of the top diagonal mount tube.
>>
>> Attached is a shot from the right side.
>>
>
> I like how you have all the bolts loaded in shear. The only thing is that I like to see tubes in compression triangulated. They may be there, but obstructed by the picture angle. Tubes from the bottom attach points to the top of the stock mount central uptubes would make the mount much stiffer.
It's try-angry-lated. The two white inner, more or less vertical tubes attach directly under/behind behind the capture points on the horizontal square bar. The new top-down diagonal catches the top; the new bottom-up tubes catch the ends. Off-axis load paths are at least as good as most dynafocal offsets on proven mounts. The load into the bar should be more or less at a 45* angle toward the bottom of the firewall, minimizing the twisting load on the square bar.
I considered adding
another diagonal between the two original vertical tubes, but it already has as much angular bracing as the original dynafocal structure.
Charlie