Bonjour
N'y at'il pas de contradiction entre ces phrases extraites de la notice:

"You can also choose a 4-sroke .91 or 2-stroke .81 engine. The important thing 
regardless of what engine is used is

to make sure that the model balances about one third back from the leading edge 
of the top wing."

et 

"Check the C.G. point, which is to be balanced at about 6 to 6.5 inches (155 
to165 m.m.) behind the L.E.

measured at the root chord of upper wing center section."

La plus grande corde de chaque aile est 300 mm environs.

Je ne sait pas definir: "the root chord of upper wing center section"

L'anglais et moi dur dur

Comment positionner le centrage d'un biplan



Merci

Alain




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