The rear motor mount can be done any number of ways off the nose
         gear tube.
        I recommend a male and female rubber rod end so the down thrust
        angle
        can be adjusted.

        More dimensions soon Jerry.

        ---------------------------------------------------

        This should be everything.


        Paul Lamar ...No rotor no motor.



    Paul,  two favors if you can.  Please provide a views of the  engine
    mount without the thrust off sets.  Just a straight ahead view with
    the instruction to off set  x degrees is what I need.    And,
    secondly,  can you supply  english measurements.  I  don't do
    metric.  My only recourse is to divide each dimension by 25.4 to
    convert to inches.  More opportunity for error.   Thanks   Jerry


    No problem Jerry. Inches it will be. Throw away all those dwg's I
    sent so far.
    I had to move the engine forward and I am, awaiting further details
    on the fire wall to do that.


    --
    Paul Lamar ...No rotor no motor.


Here's a picture of the LOM installation; check out those nosegear mods!
I sincerely ask that you not refer to this as an acceptable standard of
comparison :/O
http://www.zenithair.com/stolch801/construction/engine/LOM-2.jpg


Consider the nosegear lower bearing support as a possible attach point
for the  rear mount. A series of bolts are used to attach the nosegear
bearing to the bearing support, as well as the support being bolted very
securely to the fuse bottom. We could sandwich an additional plate
above/below the bearing, using the existing bolt pattern.

Given that some form of upper mount is mandatory, and it duplicates the
function of the lower mount, and we're struggling to find a suitable
location for the lower mount firewall attach, I'm starting to wonder...

--Kenny A.


http://websites.expercraft.com/kennya/

We have five hard points to choose from. In theory we only need three.
Most people call the mid mounts in the Zenith the upper hard points.
Zenith added the fifth "upper" unneeded mount because they could :)

A little background on our mounts for everyone:
Auto engines are designed to be installed in cars. Unfortunately the
Mazda is no exception.

Aircraft engine designers gave some thought on how the engine was being
installed in aircraft.

In effect what we are doing is copying the Questair Venture mount. If
it is good enough for a 500 pound  600 HP and 350 MPH racer it is good
enough for me. I was very impressed with its structural design features
and its low weight to strength ratio. The designer choose not to use
the stock aircraft mounts for good reasons. In fact we use the same type and
brand of industrial rubber bushings. The QA engine is mounted with only three mounts.
There is a course in structural engineering college called "redundant constraint"
and load paths which has to do with why you only need 3 mounts.

People that have flown in QA's say they are one of the smoothest piston engine
airplanes. The same guy that designed this mount also designed the piper
Malibu airplane.

You can read up more about motor mounts on http://www.rotaryeng.net/motor.html


Paul Lamar

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