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Old 05-09-2018, 08:05 PM   #1
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Default 2500 Plane Faster

Hi guys.
Well I did the upgrade and have been working on the new to me Maxum 2500.
You can check her here: https://www.instagram.com/p/BiisLuOH...ken-by=vgomezp

My next question is about time to plane. I have seen it takes her more than usual to plane, and after planning she is able to gain up to 38 MPH. Which is more than enough for me. However planning faster for me is a must.

Someone at the shipyard told me I should explore props. Actually this is the one on her has a serial that ends in 23P. Not sure if that is the diameter. 3 blades.
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Old 05-09-2018, 10:05 PM   #2
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23 inch pitch is a lot, what is the WOT? What engine and drive do you have?

Do you have trim tabs and are you using them? How much gear and crew onboard?
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Old 05-10-2018, 05:38 AM   #3
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What is your drive ratio?
Have to be some more numbers there....like 14 1/2 or 15...16....
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Old 05-10-2018, 11:26 AM   #4
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23 is a lot of pitch for your boat. A prop with less pitch will definitely get you on plane faster, but also reduce top end speed.
Turning Point has a prop calculator that will give you an idea of the prop you should have on your boat.
https://turningpointpropellers.com/PROPWIZARD/
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Old 05-10-2018, 03:20 PM   #5
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That guy in your video was really putting out a hug wake in the marina. Is that typical in your area?
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Old 05-10-2018, 04:24 PM   #6
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Quote:
Originally Posted by Phillbo View Post
That guy in your video was really putting out a hug wake in the marina. Is that typical in your area?
It might be typical for that operator, but that is not acceptable ANYWHERE.

Also ridiculous that he's operating at night with all of his white cockpit and courtesy lights on. I doubt he could see the wake he was creating with that much light.
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Old 05-10-2018, 04:52 PM   #7
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Quote:
Originally Posted by vgomezp View Post

I have seen it takes her more than usual to plane, and after planning she is able to gain up to 38 MPH. Which is more than enough for me. However planning faster for me is a must.
What is 'usual'?

You should start with a baseline.

1) Moderate load (1/2 fuel, 1/2 water, limited people, and gear)
2) A fairly calm day with relatively calm water.

Get the boat up on plane with the drive(s) and tabs trimmed out properly. (Tabs should be out until just before prop cavitation).

The Maximum RPM range will be between 4400-4800. Ideally, you want to be as close to 4800 without going over.

If you're over 4800 RPM, you are under-propped (Pitch is too low).

If you're under 4400 RPM, you are over-propped (Pitch is too high).

Typically prop diameter is sized to be able to swing the blades with a specific range of clearance between the blade tip and the anti-ventilation plate. Props are therefore tuned by changing the pitch. In recent years, adding blades has been done as well.

Decreasing Pitch will increase max RPM's and holeshot (Time To Plane)
Increasing Pitch will decrease max RPM and holeshot

1" Pitch = 200 RPM (roughly)

Adding blades is similar to Increasing Pitch. (I'd suggest you avoid modifying both pitch and blade count at the same time).

The concept behind overpropping is a misguided impression that being able to maintain a higher speed while operating at a lower RPM leads to better fuel economy. While it may be true in the short term, the increased time to plane eats up a decent portion of that savings. The amount of increased load on the engine is more problematic. There are those that theorize that the increased load can potentially shorten engine life.

The following information is also helpful

Engine:
Engine HP:
Outdrive:
Outdrive Gear Ratio:
LOA:
Beam:
Weight:


Mercruiser Prop Calculator:
https://www.mercurymarine.com/en/us/...or/#!/step-one
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Old 05-10-2018, 04:54 PM   #8
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Quote:
Originally Posted by vgomezp View Post
Hi guys.
Well I did the upgrade and have been working on the new to me Maxum 2500.
You can check her here: https://www.instagram.com/p/BiisLuOH...ken-by=vgomezp

My next question is about time to plane. I have seen it takes her more than usual to plane, and after planning she is able to gain up to 38 MPH. Which is more than enough for me. However planning faster for me is a must.

Someone at the shipyard told me I should explore props. Actually this is the one on her has a serial that ends in 23P. Not sure if that is the diameter. 3 blades.
Quote:
Originally Posted by shrew View Post
It might be typical for that operator, but that is not acceptable ANYWHERE.

Also ridiculous that he's operating at night with all of his white cockpit and courtesy lights on. I doubt he could see the wake he was creating with that much light.
OK, so now I see that video might actually BE the OP.

So, no offense intended there. Honestly, that is too fast for the inside of a marina. Those are all 'no wake' zones. Operating a boat at night with all of the lights on is like driving a car at night with all of the lights on.
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