Quote:
Originally Posted by Shallow Runner
Well I'm personally running an 04 Merc. 3 cylinder 40. If I had to buy new it would be Tohatsu. T.L.D.I. it's still a 2 stroke and will have more hole shot than a 4 stroke. It will also be lighter wich makes less drag and = more speed. Something to consider on you're prop selection. Lets assume you're running a 11-1/2" x 13pitch and you're turning 5500 rpm. Every number you go up in pitch you will lose 200 rpm. So 11-1/2 x 14p. = 5300 rpm. You will also lose hole shot with a higher pitch prop. Now every 1/4" you go down in diameter you will gain 200 rpm. So lets assume you swap the 11-1/2 x 13p. for a 10-1/2 x 14p. You will gain 800 rpm. because you went down 1" Im diameter. You will subtract 200 rpm. because you went up in pitch. So now you should be running 5900 rpm. The bigger the diameter the more power you will have low end and mid range. You will also be able to push a load better. The lower the pitch you have will increase you're hole shot but kill you're top end. Putting a cup in you're prop adds 1/2" to 1" of pitch. This will also help to stop cavitation in turns and in shallow water running. You hear stories about guys with the same boats and different motors getting way different speeds. The truth is a stock 40hp. motor pushes 40hp. @ target rpm. Prop selection is what makes the difference. What you have to decide is what best suits you're needs. If you're not running shallow water or the marsh, a smaller diameter higher pitch prop is you're best bet. If you're fishing the marsh or shallow water a larger diameter lower pitch prop is what you need. Assuming we're not including chopper or cleaver racing props, Yamaha makes the fastest prop on the market. The black stainless G series is the one you need. However powertech or stock mercury props are better in the marsh. Yamaha props are made of thinner steel than the others so they are faster. The thinner steel is why the other two will do better in the marsh. They are much thicker and will take more abuse.
I know it's alot of info but I hope this helps.
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The G prop is an awesome prop for a flat bottom. The rake of that prop has a lot of stern lift which works great if you have a boat that wants to porpoise.