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entoilage papier kraft

entoilage papier kraft

Message non lupar tonnaud christian » 17 Déc 2009, 09:15

bonjour
peut-on avoir qq photos ou mode opératoire pour les ailes polystyrene kraft?
surtout nervure emplanture et de saumon + formes et nombre de longerons ainsi de suite.
merci par avance.
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Re: NEBULA

Message non lupar frederic burnel » 18 Déc 2009, 08:39

Bonjour,
Voici quelques photos prisent lors de la construction.

L'aile est taillée, il faut retirer un largeur de 10mm au passage de l'axe des ailerons.
Ensuite coller BA et baguette de 100/10 qui vient fermer l'aile sur l'axe d'ailerons.
Coller les longerons, tube carbon de 5mm, avec une baguette balsa au dessus pour pouvoir raboter.
Ensuite vient la réalisation de la partie fixe de l'aileron a l'emplanture.
Découper la partie fixe dans le polystyrène et la coller que la baguette de 100/10.
Puis faire de cadre de l'aileron en balsa collé sur le polystyrène.
L'aileron et sa partie fixe sont fibré.
http://img64.imageshack.us/img64/8970/aile1.jpg

Détail du renfort pour la clef d'aile.

http://img707.imageshack.us/img707/1619/aile2.jpg

Ensuite les saumons sont réalisé en styro.
Un balsa de 3 mm est posé a l'emplanture.
Le Kraft est posé, collé a la colle papier peint, avec de la colle blanche passée au pinceau sur les baguettes balsa.
Le Kraft fait un aller retour dans l'eau avant de la poser, coté pelucheux vers la polystyrène, et les ligne dans le sens de l'envergure.

Les saumons sont fibré, et une fibre est posée a l'emplanture.

Ensuite une couche d'enduit nitro est passée sur le kraft pour une finition peinture.

http://img44.imageshack.us/img44/4523/2 ... ge0001.jpg
http://img44.imageshack.us/img44/5958/2 ... ge0002.jpg
http://img44.imageshack.us/img44/6017/2 ... ge0008.jpg

Toute la mise en forme des baguettes balsa se fait au rabot, juste un coup de ponçage pour la mise en forme du BA, pour éliminer les facettes du rabot.

Chaque demie aile a ce stade pèse 315g, + 50g de clef.

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Re: NEBULA

Message non lupar dominique » 18 Déc 2009, 12:33

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Re: NEBULA

Message non lupar Francky » 18 Déc 2009, 13:47

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Re: NEBULA

Message non lupar frederic burnel » 19 Déc 2009, 10:04

Pour répondre à tes questions Claude :

1)=> Il ne faut pas utiliser le même morceau de kraft pour l'intrados et l'extrados, car lorsque le kraft sèche, ça tire énormément.
Le risque est de voir apparaître une flèche importante au bord d’attaque, je crois que Jacques avait noté un retrait de 3 mm sur une corde de 450 mm, répartie de façon homogène, cela peut peut être choquer les puristes, mais depuis le temps que Christophe vole avec ce type d’aile la vérité est ailleurs.
L’autre raison est de respecter le sens de la trame, et de la repartir uniformément des 2 cotés, avec un seul morceau cela devient très délicat.

2) =>La colle je la mets sur le noyau, c’est plus pratique.

Les tubes de décathlon font 1.6 m de long, dans un magasin de cerf volant on en trouve de 2 m, ça fait moins de perte.

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Re: entoilage papier kraft

Message non lupar laurent matysiak » 19 Déc 2009, 10:10

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Re: entoilage papier kraft

Message non lupar laurent matysiak » 19 Déc 2009, 10:15

Bonjour

Merci Fred pour tes explications.
As tu suspendu tes ailes avec des pinces à linge comme JPLR le fait ?
http://modelairclub.ch.free.fr/?p=4-3-1&lang=fr

Crosby, Still, Nash and Young dans Southern Man (extra le solo à partir de 1'30 environ)
http://www.youtube.com/watch?v=VpCWlemMX7E

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Re: entoilage papier kraft

Message non lupar laurent matysiak » 19 Déc 2009, 10:15

Fred a répondu :

Oui, Il faut laisser sécher BA en bas, très important.

Pour vous donner un idée de la résistance, l'aile montée dans l'exemple de Jacques, fait 1.3 m d'envergure, 45mm d'épaisseur sans longeron.
Juste une cravate en fibre, sur 20 cm à l'emplanture et no problem.
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Re: entoilage papier kraft

Message non lupar laurent matysiak » 19 Déc 2009, 10:17

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Re: entoilage papier kraft

Message non lupar frederic burnel » 22 Déc 2009, 15:49

Pour réponde a claude,

Effectivement il faut faire l'entoilage, avec un morceau intrados et un extrados.
Je pense que cela évite un trop grande tension lors du séchage, sous peine de voir une flèche apparaitre au BA, voir de vriller l'aile, en plus c'est plus facile a poser.
Toujours faire le chevauchement sur le BA de l'intrados, question esthétisme.

La colle, je la pose sur le noyau, c'est de la colle papier peint quand on voir le peu de poudre que cela fait avant de la diluer avec l'eau, même si celle ci bouche les interstices du polystyrène, je ne pense pas que cela représente un excédant de poids important au final.
C'est plus pratique ainsi.

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Re: entoilage papier kraft

Message non lupar frederic burnel » 22 Déc 2009, 15:57

Les volets du stab viennent d’être fibrés, un 50g appliqué à 45°.
Je prépare la fibre sur du plastique de couverture pour rapport, format A4, sans démoulant
Ensuite je découpe au cutter les surfaces dont j’ai besoin.
J’applique sur les volets, et je mets sous presse.

http://img46.imageshack.us/img46/6345/dscf2910.jpg

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Re: entoilage papier kraft

Message non lupar frederic burnel » 22 Déc 2009, 20:22

Oui je procèdes de la même façon pour les ailerons, j'ai oublié un détail, avant de stratifier, je passe un enduit super léger sur le polystyrène, le même que tu utilises pour combler l'espace entre la nervure d'emplanture et l'aile.

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