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Disadvantages of a stepped hull?

Old 06-23-2019, 07:46 AM
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Default Disadvantages of a stepped hull?

I am aware of their advantages, but I donít know enough to understand what a disadvantage would be? Would it be turning? Lack of grip on the back part of the hull at speed? Would beefier strakes help in turning?
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Old 06-23-2019, 07:48 AM
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Originally Posted by Bront Antwoord View Post
I am aware of their advantages, but I donít know enough to understand what a disadvantage would be? Would it be turning? Lack of grip on the back part of the hull at speed? Would beefier strakes help in turning?
Definitely interested as well. This should be a good thread.
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Old 06-23-2019, 08:07 AM
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Its kinda hard to make general statements on the many types of hulls that have steps, but these principles may be applicable in some cases:

Steps create more bubbles forward under the hulls complicating fish finder transducer installations. Usually you have to get forward of the step, which also cuts performance at speed.

The step up in the rear in the also complicates bilge water evacuation.

Trailer bunks have to be designed different, making side rollers unusable and making float on bunks more applicable, sometimes requiring steeper launch ramps or longer tongues

As people move forward and back, the center of gravity will change, especially on smaller hulls. This effects performance on all hulls, but I understand it to be a bit more critical on stepped hulls.

Stepped hulls usually are a bit harder to trim up as they run flatter. This can effect their dryness and could also cause more bow steering in following seas.

The step is more of a help at higher speeds than slow. So its a calm weather app for faster hulls in smoother seas.

Last edited by Bullshipper; 06-23-2019 at 08:17 AM.
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Old 06-23-2019, 08:14 AM
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Planning speeds go up in every stepped boat I've been on compared to their non step variant, often at speeds I run for wahoo. The steps really want to run fast and on top. If you boat where its conducive for the type of waters you have it's a good choice. Otherwise, stay deep v
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Old 06-23-2019, 08:27 AM
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Very interesting. Following along for sure.
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Old 06-23-2019, 08:28 AM
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Was only on one but in rough weather its didn't like to go slow so I'm gonna take a guess and say steps have a higher planning speed. Up here we often have bad weather so the slower you can go on plane the better
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Old 06-23-2019, 10:45 AM
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Arenít some Deep V hulls stepped?
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Old 06-23-2019, 10:51 AM
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Their price tag...
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Old 06-23-2019, 10:58 AM
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the planing speed is also dependent on prop.....so yea if you compare same prop on stepped vs nonstepped hull, it will probably need a bit more speed to plane the stepped hull.

turning.....i keep saying this, but turning a slalom racecourse in a boat isnt really a practical attribute. Im going from point A to point B which is many miles away....im making as few turns as possible to not waste gas and time. That i might have to slow down a few mph for a turn is not something i care about.

the biggest positives for a stepped hull are range and speed, which should be expected on a hull that has less drag through the water.
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Last edited by Rod27; 06-23-2019 at 01:34 PM.
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Old 06-23-2019, 11:50 AM
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Here's what William Garden (naval architect ) had to say on the subject, read the center paragraph. Gerald
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Last edited by commuter boats; 06-23-2019 at 12:08 PM.
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Old 06-23-2019, 02:59 PM
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have had 3 different boats with a stepped hull- each performed differently- have also owned 3 other deep v boats-my current cc, a stepped hull out performs all of the others in all of the conditions that I have had it in- each of the 6 boats were from different manufacturers and ranged from 19' to 39'====different manufacturers use proprietary hull designs and I always suggest a thorough testing before purchase
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Old 06-23-2019, 03:25 PM
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Slapping noises steps make at rest/drift is the worst
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Old 06-23-2019, 04:59 PM
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have never noticed a slapping noise on any of the stepped hull boats I have owned
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Old 06-23-2019, 06:34 PM
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i have had 4 stepped boats (34-40f) and 4 without . I cant think of any real world disadvantage of a stepped hull . It is true that with some stepped hulls you have stability problems if you try and make a u turn at high speed . But do we really ever do this ? Stepped hulls dont matter on smaller hulls or at lower speeds .
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Old 06-23-2019, 07:50 PM
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Originally Posted by Bront Antwoord View Post
Arenít some Deep V hulls stepped?
Intrepid, Yellowfin,Nortech, Fountain, Donzi, etc,

Adds about 3-5 mph to cruise and top speed. Those are generalizations.

Hard turns at speed are not recommended. They ride very well on top of chop at speed.
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Old 06-24-2019, 03:14 AM
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As mentioned above it varies by hull design but one disadvantage that I have noticed is that the hulls tend to suck down and plane slower until the steps start to ventilate then they jump over the hump.
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Old 06-24-2019, 03:46 AM
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Originally Posted by billablehours View Post
As mentioned above it varies by hull design but one disadvantage that I have noticed is that the hulls tend to suck down and plane slower until the steps start to ventilate then they jump over the hump.

depends on the design of the hull and the horsepower on the transom- 35' with twin 350's will take longer to plane then 39' with triple 350's-check manufacturer planing times between comparably sized and powered deep v's and stepped hulls and I believe you will find no significant difference
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Old 06-24-2019, 06:07 AM
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Anyone here run the stepped intrepids and the go-fast center consoles (like a yellowfin, seavee z, invincible, contender st, etc)? I havenít, but the stuff intrepid says indicates they have focused on a single step to optimize for a slower speed and more stability than the others. Wondering if they plane slower, have a slower band of efficiency, etc...

its interesting too because they started with the step design before big horsepower engines existed - they werenít trying to be the fastest, but rather the biggest with acceptable performance (Iím thinking of their hulls in the late 90ís)
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Old 06-24-2019, 06:13 AM
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Originally Posted by griff12ga View Post
Anyone here run the stepped intrepids and the go-fast center consoles (like a yellowfin, seavee z, invincible, contender st, etc)? I havenít, but the stuff intrepid says indicates they have focused on a single step to optimize for a slower speed and more stability than the others. Wondering if they plane slower, have a slower band of efficiency, etc...

its interesting too because they started with the step design before big horsepower engines existed - they werenít trying to be the fastest, but rather the biggest with acceptable performance (Iím thinking of their hulls in the late 90ís)
Read this - Peters talks a bit about the Intrepid design then on to the Invincible design ... which were his ... straight from the horse's mouth so to say .

MP Step Hull
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Old 06-24-2019, 07:21 AM
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Originally Posted by ed d View Post
Read this - Peters talks a bit about the Intrepid design then on to the Invincible design ... which were his ... straight from the horse's mouth so to say .

MP Step Hull

great read
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