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Date: Sat, 05 May 2007 22:42:45 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Engine mount mockup
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MICHAEL SILVIUS wrote:
> Kelly:
> 
> The angle bracket on the firewall is actually per the design of the Falconar
> F-12. A lot of Jodel engine mounts are this as well. The plans are unclear
> as to material it only indicates 1&½" x1/8 thick angle. I tried finding this
> in 4130 but was unable to so I settled for mild steel. The triangular end
> caps are a great idea and I think I will use it. The design does call, for a
> strap to be welded so that it bridges the tube to angle iron on the back
> side as well. Here is an example as seen on Hans Teijgeler's Jodel DR1050
> with a Subaru in Holland.
> 
> Michael Silvius
> 
> Scarborough, Maine

Hi Michael,

If many other examples have flown without problem it's probably ok, but 
I'd be concerned. Did you look for 1 1/2" square tubing in 4130? You 
could cut that into 2 angles.

The Van's RV series uses a short tube and a washer at that point; it 
just adds another tube to the cluster when you weld it up. The tube is 
long enough to give head clearance beside the other tubes in the mount. 
The bolt goes through the short tube, the washer and then the firewall 
hardpoint. The washer just spreads the load like the angle does.

FWIW...

Charlie