of a thruster of a oscilative type
research works made by
numbers of scientists and our own researches we came to conclusion that
it is possible to make a breakthrough in upgrading characteristics of
hydrofoil ships proceeding to study of engine-thruster complex of
oscillative type. Upgrading of characteristics becomes possible due to
- Oscillating hydrofoils and oscillating hydrodynamics for developing
- Nonlinear hydrodynamic oscillating conditions for thrust augmentation
- Jukovsky-Knoller-Betz effect (wave flow-around effect) to reduce
hydrodynamic resistance of fixed hydrofoils
- Drives of oscillative type
- Method of adaptive optimal control of engine-thruster complex
- Ship maneuvers steering system and adaptation to sea waves
offer to produce a hydrofoil ship (boat) when lift force is produced
with the help of fixed hydrofoils and thrust is produced with the help
of oscillating leading edge flap. These questions will be enlightened
in more details below.
Increasing of effective thruster swept area
Using thrust augmentation effect while reduction of pressure head in
thruster hydrodynamic swept area.
method is well known among specialists studying thrusters. But this
effect can’t be used to a full extend because wide thruster swept area
is needed for that. And for some economic reasons it is impossible
(screws of extra-large diameter will be necessary; that means
considerable weight, problems with high-drag and failure resistance,
extra weight of engine-thruster complex because of necessity to
decrease screw revolutions). Oscillating wing gives relatively simple
problem solution because a thruster in the form of oscillating wing can
be situated along leading and trailing edge of a fixed wing. This will
allow a huge thruster swept area (even more than 10 times larger than a
common propelling screw can), thrust augmentation and higher
coefficient of efficiency.
2.2. More efficient usage
of a thruster swept area
thruster called ‘oscillating wing’ doesn’t have disadvantages of a
propelling screw: thrust deficiency of a screw near axis, inductive
aerodynamic drag at the ends of the blade, damaging air motion to the
ends of the blade caused by centrifugal force.
of effective thruster swept area (KNOW HOW)
are modes of nonlinear hydrodynamic oscillation of wing when the
effective swept area is much larger than the wing swept area at
stationary oscillation mode. Due to this effect thrust value can be
increases because while oscillation vortex separation from the wing
occurs at large angle of attack (KNOW HOW)
Propulsive thrust of oscillating wing type is projection of a lift
force on direction of a ship motion. During wing oscillations
flow-around stall will occur at much larger angles of attack. As the
result, lift coefficient and propulsive force will have much larger
value than that of the propelling screw.
It is easy to modify optimum modes using a thruster of ‘oscillating
wing’ type over a full range of speeds (KNOW HOW)
doesn’t have optimum
angles of attack at different floating speeds. Even propelling screw
with flexible blade can’t fully solve this problem. It is easy to fix
optimum angles of attack and oscillation principles remotely. It will
lead to exceeding of propulsive thrust and coefficient of efficiency.
thruster of ‘oscillating wing’ type will serve as a thruster and a
guidance blade simultaneously (KNOW HOW)
hydrofoil ships have ordinary steering wheels for that purpose. We
offer to use oscillating wings of a thruster as a rudder. By means of
that we can get positive result:
- Ship will be successfully controlled at low speeds, including
maneuvers on site, and also while ship hull comes out of water and
- There will be no need to produce special rudders.
2.7. Lift force increase
directional change of a central thrust vector (KNOW HOW)
force increase through circulation augmentation
lifting of mid position of oscillating leading edge flap (KNOW HOW)
2.9. Light trace
and a thruster leave a slight water trace.
application of hydraulic drive to
cause oscillations of a leading edge flap, power transmission from
engine to actuating hydraulic cylinders that oscillate leading edge
flaps becomes easier. Drive units, shafting and vertical columns with
bevel gear, etc. are no longer needed.
2.11. Easy and
low-priced production comparing to screws (KNOW HOW)
wing of a thruster is easy in production (symmetrical profile and the
chord is equal spanwise).
2.12. Improving of
ship course-keeping qualities, specifically on low and zero speed.
It can be
achieved with the help of a thruster of oscillative type (KNOW HOW).
of sea waves kinetic energy (KNOW HOW).
link: E.Sorokodum and Francois Kneiders, Edited by: Mary-Sue Haliburton
and Sterling D. Allan
Propulsion: Brief History and Remedy" /Pure Energy Systems
News - Exclusive, Sept. 21, 2005
system of engine-thruster complex of oscillative type.
produced several controlling systems:
characteristics (frequency and amplitude of oscillations) hand control
for automatic determination of thruster optimal characteristics (first
for automatic determination of thruster optimal characteristics (second
and ships we propose will:
1. Have less engine power because less thrust is
2. Have less weight of engine, transmitting elements, fuel and fuel
3. Have less displacement transporting the same commercial freight;
4. Will have cheaper price;
5. Commercial transportations will be cheaper;
6. Will have higher transportation safety and improved course-driving
and maneuvering qualities;
7. Will be safety for fish and swimming people; sea ores and nets don’t
8. Have less rigid requirements to location of power-units and control
systems on the ship;
9. A ship with oscillating thrust has more aesthetical Physical
configuration than one with a screw;
10. Improvement of course-driving qualities in conditions of sea
11. Extract kinetic energy of sea waves.