William wrote:

Paul,
Here a some photos of a cardboard and styrofoam mockup of the rear
mount
that will also serve as the base plate for the Alternator mount.

Base plate of 4x6 x 0.125 plate with 5 holes for the 10 and 12mm
bolts in
the end housing,

3" length of 0.065 wall square tubing, and

2 pieces of 1/8" measuring 1.5"x2.5"

Some questions, with 4130 steel (not cardboard and foam!), are these
thicknesses enough for alternator support (would be bolted to 4x6
plate)

Bill Schertz
KIS Cruiser # 4045

Looking real good Bill. That should work great.

There is usually a trade off between weight and complication
on these types of brackets. Thick material means a simpler part
while a light weight part using .040 or even .032 means some gussets
and welded on washers will be necessary.

I assume you have the 1/2" square 4130 tubing with .065 wall. I was
amazed you could get it in .065 wall. Usually it is .049 wall which
would be plenty strong enough for that part. Aircraft Spruce list
only .035 and .049.

Paul Lamar

Won't a 12A/early 13B front cover with the bolt holes work for some of
these installations?  I bought one and it bolts right on. It has 4
heavy
bolt holes already in place. Only the oil pan holes are different, but
you
can (supposedly) get an early 13B pan that fits.

Scott Gettings

Sure I think they will. Bill's bracket will also hold the alternator
eventually
which he has not shown yet. Bill's method makes one part do two jobs.
Also in the case of the Kis Cruiser the rear motor mount strut must be
off set
to clear the nose landing gear. In addition it will fit any year
front cover and Jerry can mass produce them at lower cost than custom
rear mounts. The advantage of the strut mount is it can be adjusted for
best thrust line angle. In the case of your Sea Hawker (as I recall) it
might not
be advisable and the 12A front cover would probably be better.

Paul Lamar

As long as we're on the subject of rear motor mounts, would there be
anything to be gained by having 2?  Both attatched to the same point on
the motor, but the other ends attatched to the right and left sides of
the firewall respectively?  That way you could not only adjust the pitch
of the motor, but it's cant from left to right as well.

Chris Cosman

Now why would you want to do that Chris? :) If an asymmetric  single strut offends your
esthetic sense by all means use two :)

Paul Lamar
 
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