I think SM should pay you for all this e-learning lessons
You are right again Duncan (it's becoming boring ah ah ah) I had to put two blocks of balsa inside the fin and two hard wood rod in the rudder. I think that now my two hinges are more solid than the three SM because, as you see from the pictures of Nicolò, the SM balsa blocks inside the fin are not so secure....[&:]
Ciao
A