55.1 mph with 30 hp mercury

[Fastjeff57]

That motor is really a de-tuned 40 hp (40 cubes). They're no slouch!

Jeff

[Popa Sam]

Before making any of the changes recommended you need to find another place to run. If you experience a blow out running in this location, those bridge pilings are gonna hurt.

[David Mason]

If you raise the engine, you might need more prop.

Trick is to continue going up in smaller incraments, and stop when the speed levels out, or drops. Then you know your particular hulls limits with that prop. There is no math formula that can be 100% accurate on your rig. It simply gets you in the ballpark, and you fine tune from there. Test a lot. You might try going above the bottom if you have a gearbox that will handle it. You could swing a larger prop and possibly get more top end, but you will be giving up a lot of low end.

[chris3298]

That motor is really a de-tuned 40 hp (40 cubes). They're no slouch!

Jeff

These 30 yamaha are they 3 cylinder? and what are the years they made them? I ask because a guy I work with has one and I told him about it today because he was thinking of looking for a 40 hp but hell if this motor is that good then I'll tell him keep it. He said he was offered a good bit a few years ago for it and never sold it.

[tyst67]

YES SIR 55.1 mph is what the gps says everytime

[chris3298]

YES SIR 55.1 mph is what the gps says everytime

That is awsome

[tyst67]

Thank you guys!! i'm proud of it and it took alot of hard work!

[serious3]

These 30 yamaha are they 3 cylinder? and what are the years they made them? I ask because a guy I work with has one and I told him about it today because he was thinking of looking for a 40 hp but hell if this motor is that good then I'll tell him keep it. He said he was offered a good bit a few years ago for it and never sold it.

nope its a twin cyl same as my 40hp they certainly scream! mine will turn to 6800rpm!

[MWhite]

YES SIR 55.1 mph is what the gps says everytime

Cool. dont mess up and hit that bride pier man, cause it wont be nice. lol

[MWhite]

Thank you guys!! i'm proud of it and it took alot of hard work![/QUOTE Thats what it takes sometimes, lots of testing with everything from props,, to boats height, weights and it pays off sometimes.