Principles of steps - Advantages and disadvantages of a stepped hull compared to a conventional Deep - V
The steps are terraces (steps) in the transverse axis of the vessel. Historically, the step which is fairly an old idea, have emerged as early adopters over 60 years ago. The basic operating principle is the quantity of trapped air, thereby reducing the friction of the hull to the sea and reducing friction caused by the wetted parts of the hull - the step reduces the wetted but increases the waterline when the boat is cruising speed Beyond that, each vessel has its own design philosophy and the use and purpose of existence of the steps may be varied as appropriate. With proper design,construction and installation on a vessel, we have generally the following advantages:
 

• Highest performance with the same engines, so fewer consumption
•  Ability to use lower horsepower motors
• Straight navigation without rising of the bow is a particularly important feature for our seas with strong waves (winds)
• Smooth depreciation and comfortable, more 'gentle' ride

The steps are difficult to apply in a short craft, partly because of they are built in the center of gravity of the vessel and in small boats can easily be changed significantly due to loads, resulting in low efficiency. In general, drawbacks of step can be considered as follows:

• complex design and construction
• Higher costs of research and development
• A sufficient length of hull