At 07:15 AM 9/9/2016, you wrote:
>If you put a full 1/2 inch pice of 9 ply wood and then. The 
>aluminum  3 inch angle. Behind it. With the 5 attach points engine 
>mount. From great planes.
>What does the neters  think about this compination ??
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Way over built !!!  The firewall itself is not what breaks it's the 
attachment to the 
boat.  see:  https://dl.dropboxusercontent.com/u/32133949/100_1231.JPG

Jeanette Rand once stated that an engineer once analyzed the firewall 
and it is good for 22G's.  I did add a single layer of KR clothe to 
the vertical edges with a two inch overlap on the ply sides.  I also 
used 3/4" X 3 1/2" spruce cross pieces top and bottom instead of the 
5/8" X 3" spruce.  My 0-200 hangs on a HAPI VW mount which does not 
place the mount near the longerons but more to the center of the 
firewall.  Marty Roberts had a stock firewall with the same mount for 
his 0-200 and pulled 6 G's.  Is thats strong enough?

I'll admit to never having made a hard landing :-) to check my setup 
and have not pulled more than maybe 2.5 or 3 G's ever but my engine 
is still hanging out there.

Larry Flesner 


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