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Ian,

Use as large a rivit as possible I believe there are 3/16 in rivits somewhat
soft that still hold up well to distribute the load to the glass.  I would
suggest a minimum 3 inch spacing (I used 1.5 inches) on the top and bottom
splice and a smaller spacing on the lower aft cowling-fuselage side and use
two screws and nutplates at the lower end to reduce vibration stress and
fatigue on the lower hinge ends.  I also added additional bids on the top
and lower halves of the cowling to provide additional strength to the hinge
area and build sufficient depth for alignment and mating of the two hinge
halves.


In regards to engines. I have the short mounts and searched for a left front
prop governer 360.  the O-360F1A6 has that configuration and is
counterweighted thus runs smoother.  Thus you do not have to dish out the
firewall and it is cleaner on the aft side. There is a rear intake on the
motor  but I purchased an IO320B1A sump and had Lycon in Visalia CA modify
it for forward feed and installed An airflow performance fuel injection
system.  Sump and mod was $800 more and the fuel injection complete with
boost pump plumbing complete was $1800. These mods were suggested by Don
Goetz and I am glad I followed his advice.  The motor is rare but worth the
wait and search. That configuration boosts manifold pressure 2 inches on the
test stand (according to the shop owner) above the bendix fuel injection
system plus I get 1.4 inches more ram air as compared to alternate air.  The
counterweighted motor is about 8 lbs heavier.


Bob Smiley
N94RJ

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Please send your photos and drawings to marvkaye@olsusa.com.
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