Jerry Hey wrote:

Paul,  can  you give me the exact locations for the lower center
engine
attach points?   Are there clearance issues I should be aware of?
Thanks,  Jerry

Here is your drawing and a drawing of what I did.
My drawing shows the holes inside the front motor mount brackets
but it will work just as well with them out side the brackets.
Here too is the firewall dimensions that came with the KIS Cruiser.

Unfortunately I don't have the drawing on the position of the
brackets
here so perhaps Charlie can send you a sketch. Maybe later today I
can get
that
info.

  Jerry,

Here is the latest drawing showing the locations of the front gear
lower
mount attach points.  I have changed the reference in the drawing
from the
top of the firewall to waterline zero.  This makes more sense for you
as the
two upper motor mount holes lie on the waterline zero line.  The
thrust line
is exactly one inch above waterline zero.  I have the four lower
attach
bracket bolt holes located with reference to WL0 and the firewall
centerline.

Let me know if you have other questions or need other reference
measurements.

Charlie

Jerry, If you are going to put the diagonals outside of the nose gear
brackets
(9.5 inches apart) try an X under there and see if it clears the oil
pan. Are you
using s stock oil pan Charlie? If you put them inside the brackets
they need
to be 4 inches apart. The brackets themselves are 3/4 inch thick
aluminum plate.

Paul Lamar

Paul,  your latest drawing shows the thrust line to be one inch above
the top motor mount bolts.  In previous drawings including the one in
the original plans, which I received a copy of from Charlie, the
distance is 1.5 inches. I already have a lot of time in setting up the
fixture to the original call out.  I  hope it will not be changed.
Also,  I don't understand the need for an X configuration especially if
the diagonals are placed in the wide position.  There can be no pan
interference in that position.   This is a beautiful engine mount.
Let's keep it that way.    Regards,   Jerry

I moved my hard points on the firewall to get more favorable hard point
positions. This lowered the loads in the motor mount tubes slightly
and the panel bending loads in the firewall itself. The further apart
they are and the closer to the fuselage skin the better. Shame on you Vance :)
Maybe it was not Vance's decision. Perhaps those hard points are a result
of the use of a  stock off the shelf Lycoming motor mount. I suspect it is.

It is easy to beef up the firewall here and there with lay-ups on the backside 
if necessary to accommodate the new positions. Use my drawing if you want to do it the
way I did and use the stock drawings if you want to do it the way Vance intended.

Paul Lamar
 
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