Unique product design of the DDL-1

As a result of research and development at DDL Transport Systems, a unique aero- and hydrodynamic configuration of a wing-in-ground-effect amphibious craft named DDL-1 has been developed.

Lift-to-drag ratio is about 19,4. The lift-carrying wing structure of the DDL-1 takes into account aerodynamic interference near the supporting surface, which provides a significant increase in lift (+33%) and reduces induced resistance (-25%).

The principle of aerodynamic stabilization (self-stabilization) is based on the special geometry of the aerodynamic surfaces and their relative position.

The use of a boat-shaped fuselage with longitudinal and transverse redans is designed to reduce take-off speed due to low hydrodynamic drag and increase seaworthiness. Side floats designed for lateral stability are also involved in creating a dynamic air cushion from incoming air currents.

An integrated waterjet with a rotating nozzle and reversible attachment will allow for reduced power requirements of the main power unit when reaching the cruising speed, as well as maneuvering in crowded waters at low speeds.

The rear placement of the propellers contributes to better aerodynamics when moving using wing-in-ground-effect, as well as minimizing noise and spray in the cabin.

Transportation separation of the hydrofoil is provided for transportation on a trailer.

The shapes are optimized to obtain maximum aerohydrodynamic characteristics, and the hull and wings are made using hybrid polymer composite materials.