mini discus 2C Graupner équipé vol de nuit


Le mini discus est un petit planeur en mousse qui peut être électrifié facilement en 2 ou 3 axes.
L’objectif est ici est d’adapter le mini discus racer décrit sur ce site en réalisant quelques modifications pour pouvoir l’illuminer en pleine nuit.
Il va embarquer en effet 96 LEDs !


Pour supporter une telle guirlande, j’ai choisi de gagner du poids en supprimant la commande de dérive par rapport à la précédente version motorisée, et en évidant le fuselage.
Ce gain est dans la pratique compensé par le sur-poids des LEDs. Le poids avec batterie atteint finalement 143g.
De manière à ne pas être ébloui par la lumière, chaque LED sera disposée pour diffuser sa luminosité à travers la mousse du mini discus.

J’ai utilisé les rubans à LED qu’on peut trouver sur HobbyCity en 5 couleurs.

LED-S-YE_t

Ces rubans peuvent être découpés par lot de 3 LEDs et être alimentés en 3S.
Certaines couleurs comme le rouge ou l’orange acceptent une alimentation en lipo 2S sans perdre trop de luminosité.
En revanche, pour le vert, le bleu et le blanc, j’ai du neutraliser 1 LED sur 3 pour pouvoir les alimenter en 2S.

La suite en photo:

On part d’un mini discus neuf sans décoration.
Le fuselage est d’abord coupé en deux dans sa longueur grâce à une lame de cutter neuve.
Il sera évidé de la queue, dérive comprise jusqu’au niveau du bord d’attaque.
On laissera une épaisseur comprise entre 5 et 10mm pour que la rigidité soit encore présente.
On collera ensuite des rubans de LED à l’intérieur selon ses goûts.


La partie supérieure de l’empennage subira le même sort.

Au niveau des ailes, après les avoir équipées de servo et d’un renfort carbone comme sur le mini discus racer, on fraisera des orifices à chaque emplacement de LED sans traverser l’aile.
Plus le fraisage sera important, plus la lumière sera intense et diffusée de manière uniforme.

La partie avant du fuselage ne sera pas intégralement évidée pour conserver la solidité du modèle.
Comme sur le mini discus racer, on se contentera d’un usinage de la bulle et d’une saignée pour accueillir la lipo et le contrôleur brushless.
Un petit récepteur 2.4gHz ASSAN 4 voies n’aura aucun mal à se glisser à l’intérieur du fuselage.

Une fois refermé et alimenté, on retrouve modèle très coloré qui tranche avec son look « blanc de mousse » lorsqu’il n’est pas allumé.
Le fuselage a maintenant des airs de néon.



En vol nocturne, on arrive très bien à distinguer le modèle et son orientation.
Il reste petit et rapide comme le racer, mais il se pilote vraiment comme en plein jour, sans appréhension particulière.

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