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NHBull

Yup, another prop question

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......sorryūüėě

 

My 15x15 aluminum prop on the Honda 115 does a fine job pushing my 1775 impact up to 40ish at 5800 rpm.

My only rub is the time it takes to get on plane and a bit of porpousing.

I was thinking a four blade might help. Honda does no recommend a dolphin, and mechanical trim tabs aren't out of the question.

Any input is appreciated!

I do not mind loosing a couple mile on the top end.

Thanks 

 

 

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Proposing has a lot to do with weight distribution in the boat and over trimming too quickly. If you have water in the livewell for no reason empty it saving a few hundred  pounds.

Aluminum prop is a good spare prop, you might want to consider a stainless prop that doesn't flex.

Tom

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If you are getting into the 40's even with great conditions and a strong tail wind, I wouldn't touch a thing.  I have to assume that's by a happy speedometer, a 15 on that motor won't run 40 even with zero slip.

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4 minutes ago, Way2slow said:

If you are getting into the 40's even with great conditions and a strong tail wind, I wouldn't touch a thing.  I have to assume that's by a happy speedometer, a 15 on that motor won't run 40 even with zero slip.

I get 40 in the spring with the cold water, 2 guys, 1/2 loaded, no water in wells

37 in August, same set-up.

That is why I don't mind giving up some top end to keep the nose down

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IME proposing is often the result of over trimming - back it down a bit.

There's going to be a sweet spot - exceeding it will not improve that.

 

I believe it's all about the numbers here, always is.  

 

  I did a little digging around in the spec because I got that kind of time.

Found some interesting numbers. 

The 1775 is rated for 125hp, so with that 115hp, you're a little underpowered.

Also according to Lund, the 1775's hull weighs 1310lbs and is 'rated' for 6 people.

So if we use a standard 150 lb per human - that's 900 lbs of flesh.

Now Lund does not list an actual weight capacity - just the people.

Most times weight capacities INCLUDE the weight of everything else on the bat - motor, fuel people & gear.

 So that 900lbs, in reality, includes all of that, not 900lb of people Plus gear. 

 So when you subtract the weights of the motor, fuel & gear - the boat may be rated for 6 very small people.

 This can not be ignored - especially when one is attempting to figure out why the vessel may not be performing as expected and is about to throw MORE money at it. 

 

For comparison, the 1875 Pro-V bass weighs 1475lbs and is rated for 4 people while having a max hp of 200.

 

Here's why I believe this to be significant. 

If we simply add the weight of the hull with the 'capacity' weight - 

1775 stats  1310lb + 900lbs = 2210lbs  being moved with 115 hp.

1875 stats  1475lb +  600lb = 2075lb being moved by 200hp

 

We are not accounting for gear, fuel, or the weight of the motor here. 

 

A vessels hull design and proper/balanced gear storage could help, when both vessels are loaded to meet their 'capacities' seems the 1775 has its work cut out for it. 

 

Finally, the posted speeds by Lund for the 1775 are 46 mph with the 125 hp.

 I'm good with saying that these manufacturer numbers are like auto expected gas mileage. 

We might get close but we'll never achieve nirvana.  

 

Perhaps check the weight & location of your gear, maybe you can make some headway there.  

 

Talk to the Lund dealer and see if they have advice on whether a 4 blade prop could help.

 

A-Jay

 

 

 

 

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@A-Jay

Thanks for going the extra mile!

I do believe I am getting the best given what it is, and I knew that going in.

I know a SS prop would help, but was just wondering out loud what others might do.

More than 2/3 of my time, I am by myself and rearranging gear is an absolute nessessety.

This is clearly a first world problem ūü•É

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5 minutes ago, NHBull said:

@A-Jay

Thanks for going the extra mile!

I do believe I am getting the best given what it is, and I knew that going in.

I know a SS prop would help, but was just wondering out loud what others might do.

More than 2/3 of my time, I am by myself and rearranging gear is an absolute nessessety.

This is clearly a first world problem ūü•É

You're welcome my friend - 

I was bummed out that you were having this grave struggle and wanted to do my part to assist with a peaceful resolution.

Let us know how it goes.

:smiley:

A-Jay

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