Question about prop for a 20 foot boat w/ a 140 HP Johnson.
I tried a 3 X 14 X 19 first and was able to hit 6300, yesterday I tried a 3 X 14 X 21 and max rpm was about 5500, we were relatively light (~800 pound load).
I am sure we were at redline with the 19, and I think it could pull a little more pitch.
Can anyone make a recomendation? This 140 was built by Suzuki, so essentially the same motor as a DF140.
This is a relatively flatbottomed riverboat, we go out on the ocean once or twice a year, and would run a prop on any long trips on the Tanana or the Yukon, so I think, I prefer a aluminum prop?
Anyone ever try/use a pro-pulse prop?