RE: Mojo 40 a good beginer for 3D?
Yes the mojo is a great place to start. If I were to recommend the best place to start, it would be a mojo or lamyak. The best combo is a 55ax with a 13x4 Xoar or APC sport if you want to 2 stroke it. I would sell or repurpose the ST60 as it is too heavy for 40 size and not enough power for a 60 size 3Der.