The only toy that gets better as it gets less efficient...

[greggmck]

That�s not what I said, scroll back up and read.

the forces per a given rpm are the 99.9% same whether at 11.5 mph or at 23mph.

no one is talking reving the engine in neutral.

Sorry. But this is not true. Drag on the boat increases with the square of the speed. The engine must burn more fuel to sustain speed as drag and/or load (ballast) increases for the same rpm. By burning more fuel the engine produces more horsepower, increasing the load on the engine internal parts.

Do this simple experiment: put your car on cruise control on a flat road. Note your rpm and mpg. Now point your car to a hill. The cruise control will try to hold the same speed. The engine computer will increase fuel flow to increase power (engine load) to maintain the speed the same. You will see mpg decrease significantly. If the engine cannot hold speed at maximum fuel flow the transmission will downshift.


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[nyryan2001]

Sorry. But this is not true. Drag on the boat increases with the square of the speed. The engine must burn more fuel to sustain speed as drag and/or load (ballast) increases for the same rpm. By burning more fuel the engine produces more horsepower, increasing the load on the engine internal parts.

Do this simple experiment: put your car on cruise control on a flat road. Note your rpm and mpg. Now point your car to a hill. The cruise control will try to hold the same speed. The engine computer will increase fuel flow to increase power (engine load) to maintain the speed the same. You will see mpg decrease significantly. If the engine cannot hold speed at maximum fuel flow the transmission will downshift.


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wrong.

Drawing an analogy between a car with tires with 100% 1 for 1 in traction on the road... to a prop in the water, slipping... or not moving the full 17” forward (ie 17x17 prop per se) depending on the weight in the boat and the prop shaft angle....underscores that you don’t understand prop slip or what it is. bad comparisons.

Most simply put: the “4000lbs?” of thrust applied at the prop shaft pushing forward at 3500rpms surfing 11.5mph with 3k ballast is the same “4000lbs” of thrust applied at 27mph with no ballast.

there is no such thing as hard surfing 3500rpms vs an easy cruise 3500 RPMs. Same 4000lbs thrust ( whatever it is), roughly equivalent, but different forces are pushing back keeping you from going faster.

It’s a trade between pushing heavy surfing ballast weight (LOTs of prop slip) and 27mph water friction and wind drag with less slip. The same “4000lbs?” of thrust, along with all the wear and tear on the drive trains is probably identical in either scenario.

if this still doesn’t make sense to you, research prop slip... it’s the same 4000lbs of thrust (along with wear and tear) in either scenario.

Now.... if you find a way to reduce RPMs?? Yep, certainly a different story. I miss my 550hp G able to surf 4000lbs ballast at 2800rpms with a custom prop. I think my 550 was more fuel efficient for how I use my boat.

[greggmck]

This is clearly a waste of time...

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[Skidave]

Filling the boat up with gas equals a day of fun. Doesn't matter what you are doing...

Mic Drop!

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