Flapping Wing

Hybrid turboprop-turbojet engine for VTOL

2012-01-20T06:10:00.000-08:00

Ornithoid with passive articulated adaptive wing 2

2011-12-16T03:56:00.000-08:00

Engine powered ORNITHOID

Ornithopter mechanism - 2005

2011-12-13T22:40:00.000-08:00

Caseless ammunition and gun Velkov

2011-11-26T08:53:00.000-08:00

Ornithoid with passive articulated adaptive wing

2011-11-21T06:30:00.000-08:00

Manned ornithopter with passive articulated adaptive wing

2011-08-09T11:40:00.000-07:00

ADAPTIVE ORNITHOPTER WING

2010-04-23T05:21:00.000-07:00

RC CONTROL OF THE WINGS

VTOL VERTOPLANE

2010-03-10T00:22:00.000-08:00

VERTOPLANE takes vertically and having reached a certain horizontal speed, its rotor-wings are fixed and the flight continues in an aircraft mode. VERTOPLANE have hybrid turboprop-turbojet engines.

Electric car with wind generator

2010-02-02T23:50:00.000-08:00

Basic properties of the flapping wing and features of the flapping flight

2009-09-17T06:53:00.000-07:00

The principles of the flapping flight of all flying creatures realized either by birds or by insects are just the same. THE FLAPPING WING HAS AN ELASTICITY BOTH ALONG THE SPAN AND THE CHORD. The elasticity along the span conduces to the smoothness and high effectiveness of the flapping flight. The adaptive elasticity of the wing along the chord make it possible to achieve a maximum traction in a wide range of frequencies and amplitudes of the flaps. THE TRACTION IS CREATED BY THE OUTER PART OF THE WING WHILE THE INNER ONE GENERATES THE MAIN PART OF THE LIFT. When the inner part of the wing is moving upward the outer part lags and bends downward in relation to the inner part because of the air drag and inertial forces. In this way the drag of the wing as a whole diminishes. When the inner part is nearing the up position the elastic forces raising the outer part upward and latter continues to create traction while the reaction aids the inner part and the wing as a whole to pass across the up position and to begin moving downward.THE WING ELASTICITY ALONG THE CHORD IS SUCH THAT THE WING PRACTICALY DO NOT BEND IN GLIDING-EQUILIBRIUM POSITION.

The direction of the wing flapping motions is not perpendicular to the flight direction but with declination backwards which decrease by increasing of the flight velocity. The wing behavior and the aerodynamic forces action during a flapping motion are shown on fig.1.(The lines of the paths at the scheme are projections of the solid lines.)

FLAPPING WING AERODYNAMIC FORCES

V - flight velocity

U - flapping motion velocity

W - total wing velocity

X - drag

P - TRACTION ( U > V ), LIFT ( U < V )

R - total aerodynamic force

It is evident from fig.1 that during both the downward and upward motion the outer part of the wing is creating the traction, while the inner part does the lift.In the course of the flapping motions the wing behavior automatically results from the inherent elasticity of the wing.The inner part of the wing produce lift during the upstroke too, because the flapping motion velocity U is little in comparison with the flight velocity V and the inner part is twisted downwards in equilibrum position.

THE FORCES ARE DIFFERENT(SIZE AND DIRECTION)IN EACH SECTION OF WING AND IN EVRY MOMENT OF CYCLE OF THE FLAPPING FLIGHT.

THE AIR STREAM OF THE FLAPPING WING IS FAN-SHAPED AND IS IN DEPENDANCE FROM CORRELATION FLIGHT VELOCITY/FLAPPING MOTION VELOCITY FOR THE DIFFERENT SECTIONS.

The above statement clarifies the flapping flight mechanism. It is important to point out that the mass distribution and the mass/elasticity ratio are of great significance for a maximum flapping wing efficiency. THE MASS / ELASTICITY RATIO IS DISTRIBUTED OVER THE WING IN A WAY ALLOWING THE WING - WHEN BENDED AND THAN RELEASET - TO COME BACK TO THE EQILIBRIUM POSITION WITHOUT VIBRATION

As result the wing bend along the chord only under air resistance but not under inertial forces. This property determinate the way of bending of the wing at the flapping movements, that decide the problems of the mechanics and aerodynamics of the flapping flight, pitching and hering.

These conclusions illustrated by the wing behavior at level flight but the described properties and relationships give the opportunity to explain the other types of modes of the flapping flight.

September 2011

ORNITHOPTER

2009-09-16T09:19:00.000-07:00

Manned ornithopter with 8m. span

RC model of ornithopter with 2m. span

ORNITHOPTER - 1978

Variant of invention "Wing of ornithopter", realized by RC model

Variant of invention "Wing of ornithopter"

The future...

MANNED ENGINE-POWERED ORNITHOPTER.

span - 10 m

chord - 1.5 m

weight - 85 kg

(At the images it is withowt elastic rips and fabric of the wings and withowt outer part of the left wing).

The ORNITHOPTER have articulated wings and control of the elasticity of the wings.

The up-down control is through change of the angle of incidence-angle of attac. The left-right control is through rear-lower ruder, connected with the control of the fore-wheel. The tail is fixed.

By take-off the pilot move the control levers forward (image 3). The angle of attac increase,the flapping frequence (gas) and initial tension of the springs (behind the roller of the control lever) connected with outer parts of the wings increase too.

At the left control lever is the handle of the clutch, at the right control lever is the handle of the stopper of the control levers.

HUMAN POWERED ORNITHOPTER

AUGUST 2003 - NO MORE SECRETS OF THE FLAPPING FLIGHT!

2009-09-15T09:24:00.000-07:00

The tests of the RC model of ornithopter, by which are realized two of my inventions and my ideas about the properties of the flapping wing are the grounds for this DECLARATION.

By exactly correspondence of the elasticity of the wing to the mass of the ornithopter, it is possible to build ornithopters with every desired mass.

By realization of principle of distribution of the mass of the wing and correlation to the elasticity, the wings act effectively at high loading too.

By virtue of "Ornithopter" and "Wing of ornithopter" inventions, the wings act maximum effectively at different frequencies of the flapping motions at take off and flight.

The control through change of angle of incidence of the wings is very effectively at take off and flight with low velocity.

ORNITHOID

2009-09-14T09:31:00.000-07:00

The ORNITHOID is combination of my project of ornithopter and
the project of ornithopter (ornithoid) of The University Of Toronto.

Rubberpowered model of ORNITHOID

span - 85cm

weight - 120g

chord - 12cm

amplitude - 10cm

The wing have upper feathers - its form and size determine the elasticity of the wing along the chord. The resistance of the wing upwards is less than downwards.

Variant of mechanics of rubberpowered model of ORNITHOID.

Electric - powered model of ORNITHOID.

Span - 2m.

Weight - 1,5kg.

HUMAN POWERED ORNITHOID

Span - 9 m

Weight - 22 kg

Chord - 1.6 m

The wing is at midle position. It have two additional supports at rest.

ADAPTIVE ORNITHOID WING

ADAPTIVE ORNITHOID WING. THE X - DETAIL SUPPORT THE WING AT REST

HP ORNITHOID WITH ASSISTANT SPRING

ORNITHOID WING WITH FOUR ELASTIC ARTICULATIONS

ENTOID

2009-09-13T09:36:00.000-07:00

The wings flapp (rotate) 360 degrees in vertical and in horizontal mode.

In horizontal mode the flapping (rotating) wings create trust and lift.

Rubber powered model of ENTOID

Electric - powered model of ENTOID

The wing consist of flexible lamelles and elastic bands.

This wing is adaptive and suitable for horizontal mode of flight of ENTOID.

ADAPTIVE ENTOID WING

ENTOID WITH VERTICAL TAKE-OFF

ENTOID WITH HORIZONTAL TAKE-OFF

FOUR - WINGED ENTOID

ROTATING ELASTIC WING

V - flight velocity

U - rotating motion velocity

W - total wing velocity

X - drag

P - traction (U>V), lift (U<V)

R - total aerodynamic force

Links

2009-09-12T03:28:00.000-07:00

The ornithopter zone - http://www.ornithopter.org/
Univrsity of Toronto - Manned ornithopter - www.ornithopter.net
The site of Horst Räbiger - http://www.ornithopter.de/english/index_en.htm
Website of Patricia Jones-Bowman www.ornithopter-pilot.com
Dr R.Korobelnic's Flapping flight Site - http://ovirc.free.fr

The old site of Velko Velkov- http://reocities.com/Eureka/boardroom/9483/velko.htm