finding the right prop

[eggsuckindog]

Since it is at all trim angles your choice would be to lower the engine 1 hole or look for a prop that has more rake - basically longer sweeping blades

look at this pic and pay attention to the blade design
http://www.boatownersworld.com/Props...age_series.htm

my previous prop acted the same as yours, could not trim at all without it blowing out, although no cavatation except trying to trim it. It was a standard Merc prop similar to a Vengence - rounded blades kinda like mickey mouse ears

The Stilletto I have now is another hole higher and I can't get it blow out at all - careful on RPM, a prop like that will knock off 200/300 RPM per same size

On another note - when looking at them recently they are priced at $250 new which I thought very reasonable with prices I have seen

[bumpdraft]

I had a 15x15 prop on two different Johnson engines(235 and 200hp) before getting a 225 Yamaha 2 stroke for my 23. I put on a 14"x 19" prop and it made it feel like a different boat. It was fine for flat seas, but I didn't like the ride when it got rough. I eventually got a 15 1/4x 17 Saltwater series and was very happy with the prop. I changed to a Yamaha 225 four stroke with that same prop and I was only able to get 5400 rpm. I have since changed to a Solas 14 1/2 x 15 four blade and can get 6100 rpm. I should probably have a 17 " pitch, but it will do for now. I'm saving my Saltwater series, hoping to get a 250 four stroke.

[shine]

lowered my motor 2 notches, it is now about 4" above bottom of keel. Very solid bite

Fuel flow shows 9-9.5 gph at 30 mph and 4200 rpm (into stiff wind), a little better with the wind (light load, 2 adaults, 2 tiny kids and 55 gal fuel, no ice, empty boat well)

27 mph at 8.5gph, 3900, into same wind.

I did not try any slower, but I dont think it get much better, we will see.

Im happy