Brian, have you posted those results somewhere?
Yes, I did, and I found it all! Woot! I originally posted over at trailersailers.com. Pertinent info follows, for O'day 192, 18'7" LOA, 16'8" LWL.
I went from the stock "moderate" 7.7" diameter, 8", 3 blade on my Tohatsu/Nissan 5 hp 4 stroke to an 8.375" diameter, 6" pitch, 3 blade "Mickey Mouse ear" "high thrust" prop, also Tohatsu branded, from their prop charts.
TOHATSU outboard motors
With stock prop, I would turn 2160 rpm at WOT.
With high thrust prop, 2340 rpm at WOT and hitting max speeds of 6.3 knots with a light breeze on calm fresh water.
Big stern waves follow me, indicating I'm pushing very close to hull speed. My max hull speed, based on the old ship of the line displacement formula (not ideal for small displacement sailboats) is 5.5 knots. My light displacement hull speed, based on the Gerr DL ratio, comes out to a max of between 6.6 and 7.2 knots, depending on what I estimate for my max displacement. Specs for the boat listed at 1400 pounds, but I'm sure the boat weighs more, plus my 200 pounds and junk I carry on board plus motor, so, 6.6 knots at 2000 pounds displacement? I lose approximately .1 knot for each extra 100 pounds over 1400. Also, since I am in fresh water, the boat sits deeper than salt water, so should have a bit more drag slowing down max hull speed.
Psychosnail Sailing
Seloc manual says idle should be set to 1100 rpm, which is high. I have my idle set to 750 rpm, which also seems high, but motor doesn't conk out. I travel about 1.7 knots. I need to shift in and out of neutral to scrub speed for docking, and occasional shifts into forward for a bit more steerage. The high thrust prop definitely throws more water and thus has better performance in reverse.
Hope this helps!