Bruce A. Frank wrote:
...
So far I have found several Boeing and NACA publications on wings with
blunt trailing edges, or blunt trailing edges at supersonic speeds. But
little specific to light planes with top speeds of 150 mph and landing
speeds of 40 mph or less.
...

Have you found anythign on hemicircular trailing edges at any
speeds?

ISTR that struts with a circular cross-section have
more drag than similar sized square tubing. Since some
airfoils have a semicircular seciton on their leading edge,
one might suppose it is the trailing part of the circular
tubing that is responsible.

So maybe whatever benefit is realized from blunt trailing edges
would be enhanced more by semicircular trailing edges.

Then again, maybe not. I always had trouble with vibrations
and waves.

--

FF