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
 
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