Hello Francesco ( or should I say Chachalaco)
Why don´t you try the Fliton Inspire 90 , you could easily fit there a 120 four stroker , ( I am not so sure about the 140) , this one is supposed to be a F3a trainer , and besides, Fliton has quite a reputation for making insanely light aircraft.
I have an inspire 60 acro, powered by a os max 81 fs alpha , and I might honestly say that it´s the best plane I´ve ever had.


Check this address
http://www.flyinggiants.com/reviews/...duct=177&cat=6

Here´s my e-mail address if U need to contact me

[email protected]

saludos
Peter Lilliegren[8D]