Hi evrey body
I recently found a plan which seems to be a good duplication of Hanno's Supra Star called "Dupli Star"
I read the plan carefully and found that there is just a little part of the rudder surface under the thrust line and most of its area is off centered
I'm thinking of modifying the plan to have more rudder area under the thrust line in order to have more axial slow rolls and knife edges
is this a good idea to add a ventral fin or widening the fuse side area as shown in the image below? or the original profile is ok?



Regards,
Ehsan