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4 Juillet 2006

 

Le "360"

L'ornithoptere R/C de 3.60m d'A.Hairie

 

 

Pour voir en vol , le "360" d'alain Hairie clickez sur le lien Suivant : Le 360 Video Mpeg

 

 

 

27Mars2006

Mécanismes pour ailes battantes
d'envergures de 120 cm à 480cm

...............................................................................................................................................................................................

La Chauve Souris


Il y a un an , Alain Hairie faisait voler sa "Libellule".Depuis il s'est encore beaucoup investi dans ses recherches sur le vol battu. D'expériences en expériences,sa Chauve souris ( voir photos de sa Bat cis dessous), à pris son envol et quel envol !

Pour voir la Chauve souris d'alain Hairie en vol clickez sur les liens Suivants
Film1
Film2

Nous avions jusqu'à présent dans le forum Ovirc ,la catégorie des Ornithoptères R/C( Oiseaux R/C) .Grâce aux travaux d'A.Hairie une nouvelle catégorie a été crée : celle des Chiroptères R/C (Chauves-Souris R/C) .
Vous pouvez en savoir davantage et poser des questions à Alain Hairie ,en vous inscrivant sur le forum Ovirc

 

 

Mesure de la poussée statique

14/04/05 Alain nous a envoyé une photo de sa balance Roberval utilisée pour la mesure de la poussée statique.

 

12/04/05 Alain nous a communiqué une photo de "l'avant bras" mis au point pour tous ses vertébrés volants.

Aile avec "avant bras".Conception A.Hairie

 

Autogyre à Ailes Battantes

The flapping autogyro concept is good! I have build and tested such a machine. I have obtained a thrust of 500 g with a weight of 400g for the complete machine, including receiver and batteries, just as as obtained with first machine (the Falcon), wich hovers in the natural way. However, the autogyro needs only HALF of the electric power with respect to the Falcon.
Such a power saving is quite logical because the wingtips of the autogyro are in the conditions of horizontal flight. It is known for birds that horizontal flight requires about half the power of hovering.
The video explain how my autogyro works. I have not used exactly the design refered by Murray Scot, but something which is aerodynamicaly equivalent:
Imagine a bird with two right wings, one on the right side, and one on the left side! That is to say that his left wing has feathers FOREWARDS instead of backwards! If he flaps, he turns on himself leftwards and can hover if he has no seasick!
We can consider this as a reduced version of my "merry-go-round" bench test (see video on my page on this site). The only difference is that in the "rotating hovering bird", the radius of the trajectory id smaller. The propulsive part of the wing works almost in normal conditions, but of course, the part near the body has no gliding effect.
This method of "rotating bird" is a good and simple test for insect like wings, and also for the propulsive part of bird-like wings.

 Vous pouvez interroger l'auteur sur le Forum ovirk
        Film du dispositif expérimental essais du 27 Janvier 2005 ( 7Mo) Format MPeg

 

VOL BATTU STATIONNAIRE

 

Film du dispositif expérimental essais du 22 Octobre 2004 (5Mo) Format MPeg
Caractéristiques connue : Poids 390 g ;Poussée 500 g
Il reste encore à stabiliser la machine sur 6 Paramètres x,y,z et 3 angles d'orientation

 

LIBELLULE -DRAGONFLY

 

Vol de la Libellule essais du 8 Aout 2004.(7Mo) Format Mpeg

Video de l'incidence variable 500Kb Format Mpeg

Video du sytème "sauve aile" 500 Kb Format Mpeg

Video du syteme "protection antérieure" 400Kb Format Mpeg

Caractéristiques de la libellule :

"Robert,
Version corrigée et améliorée des informations sur ma libellule:
- Batterie Ni-MH, 10 éléments, 700 mAh, NPM
- Moteur brushless MP-JET AC 25/25-26
- Rapport de réduction 175, battement à 3 Hertz
- Manivelles avant et arrière décalées d'un quart de tour, soit 90 degré
- Ailes en Dépron de 3 millimètres, largeur maximale 30 centimètres
- Envergure de 150 centimètres
- Aire 0.6 m2 environ
- Poids total 930 grammes
- Vitesse 3 à 4 m/s

Merci d'avance pour ton travail de diffusion.
Amicales salutations.
Alain"

MORE DETAILS ABOUT MY DRAGONFLY

As noticed by Nathan Chronister, my dragonfly is definitely neither
an ornithopter (artificial bird), nor a bat, but an artificial insect, for
two reasons.
1 - The short-root-chord wings
2 - The flight direction fully controlled by the wings

1 - WING SHAPES
Most insects have short-root-chord wings, such that the main part of
the wing can operate in "purely flapping regime". That is to say:
a - Upstroke with low aerodynamical forces
b - Downstroke with a strong propeller effect
With birds and bats, a large part of the wing, near the body, always
operates in "nearly gliding regime". So, for these animals, the flight
regime is mixed along the wing, from gliding to flapping.
What is the best option, pure or mixed flapping, according to flight
requirements? Nature (God?) has hardly worked around this problem. I think
we can try to learn something by experimenting... It seems that Toporov has
done a lot of work, according to his pictures. I think it should be of
historical and technical interest to reproduce his machines...
I have built and tested several prototypes of birds, bats, flyes
and, of course, dragonflyes. They all fly, and a lot of experiments are to
be made. However, now, I think that the dragonfly is quite promising.

2 - FLIGHT DIRECTION CONTROLLED BY THE WINGS
It is clear that insects and bats can not use their tail for any
efficient aerodynamical control, except maybe for flight stability. Even for
birds, the action of the tail is combined the action of the wings.
Any difference between the right and the left wing can be used to
turn during flapping: area, angle of attack... Angles can be modified
directly or by changing the elasticity (compliance) of a part of the wings.
I have first controlled my birds and my bats by changing the angle of attack
of the two wings, increasing one and decreasing the other. It works. After I
have adapted the principle to the fly and the dragonfly (rear wings only -
its simpler). It works very well, and I think it is the only realistic way
for insects.
Several views show this principle adapted to the command of my
various prototypes. It is much more simple than an helicopter rotor!

A.Hairie

 

Hairie's DRAGONFLY :all the secrets unveiled !

 

Film du banc d"essai permettant d'étudier la poussée des ailes battantes ( 15 Mo) Format Mpeg

 

D'autres Ornithopteres ont été réalisés par A.Hairie :

A.Hairie's FLY

A.Hairie's BIRD

A.Hairie's ARCHEOPTERIX

A.Hairie's BAT

 

 

 

 

 
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