FR2556312A1 - Alternative, two-blade rudder with angular position which can be fixed or adjustable and acting by greater or lesser immersion of one or the other in order to obtain the chosen action - Google Patents

Abstract

Alternative, two-blade rudder with angular position which can be fixed or adjustable and acting by greater or lesser immersion of one or the other in order to obtain the chosen action. The main aim of the invention is to remedy the drawbacks of conventional rudders operating by rotation of a single blade. This rudder acts by greater or lesser immersion of one or the other blade in order to give the boat the chosen heading. The principal advantage of this rudder is always having the minimum wetted surface, which is exactly suitable for the desired action, which, needless to say, optimises its performance.

Description

GOUVERNAIL ALT @ RNATIF A DRUX PAL @ SA ANGULAR POSITION
CAN BE FIXED @ OR ADJUSTABLE AND ACTION BY I @@ ERSION
PLUS OR KOINS I @ PORTANTL FROM ONE or THE OTHER FOR OB @@@@ R
THE CBOISIE ACTION
my present invention aims to overcome the disadvantages
classic rudders acting by rotation of blades.

the disadvantages of these rudders are related to their prin
operating waxes that cause significant drag
permanent in the fluid and therefore braking of the boat.

The invention consists in the use of two separate blades
having an angular position which can be fixed or adjustable, one of the
blades giving the boat a direction, the second. the other direction.

The action of this rudder is carried out by immersion more or
less of one or the other blade depending on the recharging action
while not excluding the simultaneous immersion of the two blades
to obtain a voluntary braking action.

This rudder has the following main advantages:
- a minimum wetted surface at all times exactly suited to
the desired action, this wet surface can be zero at the ac
tion is not necessary: we see immediately that it is a
essential advantage over conventional rudders.

- the possibility of using asymmetrical shapes for the blades
high efficiency, the blades can be of any profile
(symmetrical or asymmetrical, uniform or varying according to the level,
in the shape of a plane, wing, propeller, etc.), while not excluding
usual shapes, which, of course, is not possible with a single blade.

 The blades can be fixed or adjustable according to the two profon, or any other parameter allowing to optimize the operation.

 The blades can be used with auxiliary blades associated or dissociated from the main blades to optimize operation.

- Offset inherent in the use of two blades
promoting action.

- 14 possibility of simultaneously raising the two blades
to facilitate stranding.

- the possibility of simultaneously immersing the two blades
to obtain a braking function.

FIGURES
Figures I to 3 are only an example not limiting the
scope of the invention, they illustrate its operation.

 These three figures show the stern of a monohull boat fitted with an alternative rudder with. them blades in wing profile.

 Figure I shows the rudder at rest (the two blades emerged).

 The @ figures 2 @@ @ shows @@ li @@ ersion d @@ l @ blade n I, FIG. 3 the immersion of the blade n 2 (with a view to obtaining the desifed direction of the boat).

APPLICATION DOMAIN :
This invention can be applied to all mono boats
hulls or multihulls, sailing or motor.

Claims (5)

 I - Alternative Qailail with two blades characterized by the operation by greater or lesser immersion of one or the other of the blades to obtain the desired action.  2 - Rudder, according to claim I, characterized by blades which can be of any prof (symmetrical or asymmetrical as, uniform or betting according to the level, in the shape of a plane, wing, propeller, etc ... )  3 - Rudder, according to claims I and 2, the blades of which can be fixed or adjustable according to the depths, or any other parameter used to optimize the operation.  4 - Rudder according to claims I to 3, but using in addition the immersion or simultaneous emersion of the two blades, in order to obtain additional functions.  5 - Rudder, according to claims I to 4, maie with the use of associated blades associated or dissociated from the blade. main to optimize the operation.