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France Helico • Consulter le sujet - Avis CCPM 120 ou 140° ?
Page 1 sur 1

Avis CCPM 120 ou 140° ?

MessagePublié: 29 Mai 2013, 15:45
par totofly
Bonjour,

Est il préférable de monter le nex E8 en 140 ou 120 ?
Existe il des avantages/inconvénients a l'un ou l'autre ?

Merci
Thomas.

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 29 Mai 2013, 21:17
par mmmax51
Salut,

Pour ma part j'ai opté pour le 120°.
Pas plus d'info que ca sur le 140 je me suis juste dis que si c'était révolutionnaire toutes les machines seraient en 140.
En plus les rallonge de boules sur le plateau, en ca de crash, pour moi c'est un risque de plier le plateau.
Mais j'ai hésité.
En plus si tu cherches un peu sur le web, tu trouveras trés peu de machine montée en 140°.

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 07:04
par Fab59
Salut,

mes machines sont montées en 140°.

Cela permet de mieux répartir les forces au niveau des servos...

@+

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 09:37
par Rotodingo
Pareil pour mes JR, Airskipper E8 et Vibe 50 Nex.

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 10:23
par BertrandR

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 10:27
par Ramses
Il me semblait que c'était pour que les servos aient les mêmes débattements sur les 3 mouvements du cyclique ? (Ail, Ele, Pas) :think: :think:

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 10:37
par BertrandR
Cela fait les meme débattement quand l'on regarde que le tangage, mais si tu regardes le roulis, bah, le probleme est le meme, non?

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 11:05
par totofly
Merci,

Pour vos conseils, J'ai commencé le montage en 140° et reste comme ça.

Thomas

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 14:38
par Djidane
le 120° permet une répartition uniforme des forces sur les 3 servos

le 140° permet d'avoir le même débattement des servos, mais surtout et de ce fait, ça permet d'avoir un déplacement bien horizontal du plateau cyclique lors de grosse variation de pas et de ne pas avoir de perturbation sur le pas lors de grosse demande d'allé-retour sur le tangage,

en 120°, en regardant la machine de profil, le coté cyclique ou il y a les 2 servos ont les rotule plus pres du mat rotor que le 3eme seul de sont coté, d'un point de vue "ordre de tangage", le bras de levier est plus cour et donc mettent moins de temps a atteindre la position souhaité,
comme il y a un bras de levier/distance a parcourir plus cour d'un coté que l'autre, avec une vitesse de déplacement identique, ca créer une perturbation sur le pas.

pour le voir rien de plus simple: hélico sur la table, mettez le pas a 0°et faites atteindre au plateau cyclique les buté avant et arrieres en allé retour successive le plus rapidement possible pour les servos et regarder la boule du plateau cyclique faire des petites monté/descente, ce qui signifie qu'il fait de petites variation de pas

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 15:47
par Rotodingo
Par contre en 140° les efforts sur les servos ne sont pas identiques il me semble. Bref en 120°, efforts identiques mais courses non, en 140° c'est l'inverse. Je note que chez JR ITO est en 120° sur ses machines dans toutes les vidéos que je vois (pour le moment).

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 17:49
par totofly
Voila des réponses précises !

On peut peut être en conclure que le 120° est plus adapte a une utilisation 3D et le 140° pour une utilisation F3C ?

Thomas

Re: Avis CCPM 120 ou 140° ?

MessagePublié: 30 Mai 2013, 19:22
par rotoracing
Et Thunder Tiger a sortie le 135° pour avoir les avantages du 120 et du 140°. :handgestures-thumbupleft: