Stepped planing hull – pros and cons (Eng)

There are a lot of legends connected with steps on hulls.  Many people claim that this solution is good only for the racing industry and is very dangerous for normal recreational users.  What are the real facts, however? There is ample evidence showing that the stepped hull has less drag than the classic deep V-hull. […]

Conceptual assumptions – a new boat

Prior to selecting a boat, every prospective buyer should take the following issues into account: Aesthetic issues and additional equipment should be put aside: come back to them after establishing the following issues: The most fundamental question you need to ask concerns the purpose of the boat: leisure or commercial one. If leisure, then is […]

Surface Drive

Surface Drive is dedicated to fast motor boats as the most effective of all the types of drives; however, as every drive, it has its limitations of use. It may not be used for bay watch rescue boats due to the risk of injury (as other drives, except for water jet). It is precisely due to […]

Types of drives and their short description

Traditional propeller drive on shaft – simple construction and high reliability, for speeds below 30kn, and also for big and heavy vessels. The drive is tolerant of high load differences and it works well in difficult conditions. It is cheap to maintain and the cheapest to purchase. Stern drive  –  Z – type transmissions for […]

Comparison of producers of surface drive systems

Trimability – it is the main feature of surface drive, making it possible to fully use its potential. It is this feature that enables easy operation of the reverse gear, obtaining maximum speeds in different sea conditions and sailing in the shallows. Thanks to trimability we can eliminate or significantly reduce bouncing up the hull by […]

Information that is necessary to select an appropriate drive

In order to select an appropriate drive, it is necessary to adopt a holistic approach, taking into account the operating environment, as well as hull, engine and gear unit data. Type of hull – monohull (single), catboat or trimaran; each of these hulls has a different influence on hydrodynamic resistance and stability. Displacement , weight – a […]

Detailed comparison of SDS and Water Jet

The most frequent question asked by potential clients is why SDS should be used instead of Water Jet. We always give the same answer to this question: it depends on the purpose of using the boat. In certain areas, SDS has considerable performance advantage, but there are also areas where this advantage belongs to Water […]

Selection of gearbox units

The right choice of engine revolutions transmission is another key element from the point of view of performance and drive effectiveness. The following elements have an influence on transmission: engine revolutions (rpm) power to weight in tonnes ratio (hp/t) speed of advance or  Froude coefficient (V/LWL0,5)   Where: V – speed in knLWL – waterline […]