Apparently, in the technical work appeared in the phenomenon that can be called bottle-modeling. The fact that modelers in different fields are increasingly used… plastic bottles. From these light and sturdy vessels, they made a great hull models of yachts and catamarans, compressed-air cylinders to drive the action of the compressed air motors air and car. Thin clear plastic was the ideal material for the manufacture of lamps for aircraft models.
And here is another model design that uses plastic vessels. It is a catamaran with an original rotary wind propulsion.
First a few words about how the rotor appears driving aerodynamic force. It has been noticed that if you put a rotating cylinder into the air flow, the cylinder will apply a force perpendicular to the direction of flow. The fact that the rotation of the cylinder the direction of movement of one part of its surface coincides with the direction of air flow, and rotation to the opposite end — towards him.
In accordance with the Bernoulli law, establishing the conformity of the air flow speed and pressure with increasing flow rate the pressure in it decreases. When blowing the rotating cylinder in the zone with oncoming traffic the cylindrical surface and the flow pressure is less than in the area with associated movement of the cylindrical surface and air. The appearance of a pressure difference causes a force directed perpendicular to the motion of vozduho-d flow from areas of greater pressure to a zone of lower pressure.