Low resistance round bilges and smooth integrated skeg, optional bow and stern bulbs, yet not a single plate with compound curvature. The EconoForm is the first hull form composed entirely of flat or conical surfaces, yet performing like a round bilge hull. The result of many years of research in the area of hydro-dynamics and surface definition, the form is unique enough to warrant a patent, now pending in Canada, USA and Japan.
The parallel midbody has cylindrical bilges and either vertical or sloped sides. Vertical sides are typically applied when maximum deadweight is specified. Sloped sides are used when high speed and/or high deck payload is required. The forward body features either a vertical stem, typical for supply vessels, a traditional sloped stem (not recommended by NaviForm but possible), or a reverse sloped stem, forming a partial bulb. Unlike large volume round bulbs, which perform only in trial conditions, the EconoForm bulb provides benefits consistent in all weather or loading conditions.
The aft body features reduced buttock angles, made possible through redistribution of the volume and fitting an integrated low resistance skeg. The aft body is suitable for fitting either azimuthing thrusters, single or twin propellers open or in nozzles, or single or twin stern bulbs (separate patent held in Canada) reducing shaft length and increasing open water efficiency of the propeller.